Patent US4237486A successfully refreshed from Google Patents.
US4237486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compatible transmission of an encoded signal with a television
Assignee: Comsonics Inc
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Filing: 1978-11-09
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Granted: 1980-12-02
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Expires: 1998-11-09
Abstract
Abstract A method and apparatus of compatibly and simultaneously transmitting and receiving an encoded signal with the normal visual and aural carrier of a television signal is disclosed. The encoded signal is used as a modulating signal to frequency modulate the visual carrier frequency signal prior to amplitude modulating the visual carrier frequency signal with a source of composite video signals. Normally, the introduction of additional sideband power even in the form of constant amplitude components will cause visual distortion to a received picture due to the normal Nyquist shaped bandpass characteristics of the intermediate frequency amplifier in the television receiver. This distortion is reduced or eliminated in several ways. The maximum allowable frequency modulation deviation can be limited so that the visual distortion is substantially reduced. Where greater frequency modulation deviation is required, the interfering beats which appear as horizontal lines are made less visable by adjusting the frequency modulation deviation so that these lines roll vertically at a maximum rate. A more desirable approach is to amplitude predistort the frequency modulated visual carrier frequency signal in a complimentary mode to the slope of the video intermediate frequency amplifier circuits of the television receiver. In this manner, an incidental amplitude modulation would be added to the television visual carrier at the transmitter, and this incidental amplitude modulation is in the opposite polarity of the slope of the modulation taking place in the receiver. In other words, by predistorting the frequency modulated visual carrier frequency signal, the signal is in effect pre-equalized to the Nyquist bandpass characteristics of the television receiver intermediate frequency amplifier. The predistortion of the frequency modulated visual carrier signal may be accomplished passively with a bandpass filter having its lower frequency slope at the television picture carrier frequency and having bandpass response characteristics which are complimentary to the Nyquist bandpass characteristics of the television receiver intermediate frequency amplifier. Instead of a passive bandpass filter, similar results are obtained by active, pre-equalizing circuits in the transmitter. Specifically, a phase opposite correction signal derived from the encoded signal is added to the composite video signal prior to amplitude modulating the frequency modulated visual carrier frequency signal. In any case, normal aural carrier generation methods avoid any interference by the addition of a frequency deviation of the visual carrier. The received signal is detected to separately reproduce the encoded signal.
Inventors
- 👤 Richard L. Shimp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:19
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/08; H04N7/081
Claims Analysis
Total Claims: 91
Claim 1
Independent Claim
73 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, and transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 2
Independent Claim
73 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, and transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 3
Independent Claim
91 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, and transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 4
Independent Claim
91 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, and transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 5
Independent Claim
102 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating with the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, amplitude predistorting the frequency modulated visual carrier frequency signal in a complimentary mode to the slope of the video intermediate frequency circuit of a television receiver, amplitude modulating the frequency modulated and predistorted visual carrier frequency signal with a source of composite video signals, and transmitting the frequency and amplitude modulated visual carrier frequency signals.
Claim 6
Independent Claim
102 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating with the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, amplitude predistorting the frequency modulated visual carrier frequency signal in a complimentary mode to the slope of the video intermediate frequency circuit of a television receiver, amplitude modulating the frequency modulated and predistorted visual carrier frequency signal with a source of composite video signals, and transmitting the frequency and amplitude modulated visual carrier frequency signals.
Claim 7
Independent Claim
116 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprision the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, adding a phase opposite correction signal to the composite video signals prior to amplitude modulating the frequency modulated visual carrier frequency signal such that amplitude variations which would occur in a television receiver due to the response characteristics of the receiver are pre-equalized, and transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 8
Independent Claim
116 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprision the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, adding a phase opposite correction signal to the composite video signals prior to amplitude modulating the frequency modulated visual carrier frequency signal such that amplitude variations which would occur in a television receiver due to the response characteristics of the receiver are pre-equalized, and transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 9
Independent Claim
87 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, phase shifting and adding the encoded signal to a composite video signal to produce a pre-equalized signal, amplitude modulating the frequency modulated visual carrier frequency signal with the pre-equalized signal, and transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 10
Independent Claim
87 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, phase shifting and adding the encoded signal to a composite video signal to produce a pre-equalized signal, amplitude modulating the frequency modulated visual carrier frequency signal with the pre-equalized signal, and transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 11
Independent Claim
103 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, amplitude modulating in an amplitude modulator the frequency modulated visual carrier frequency signal with a source of composite video signals, applying a variable bias signal to the amplitude modulator, said variable bias signal being derived from the source of encoded signal with a leading phase shift, and transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 12
Independent Claim
103 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, amplitude modulating in an amplitude modulator the frequency modulated visual carrier frequency signal with a source of composite video signals, applying a variable bias signal to the amplitude modulator, said variable bias signal being derived from the source of encoded signal with a leading phase shift, and transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 13
Dependent Claim
35 words
The method of transmitting recited in claim 6 further comprising the step of adjusting the phase shift of the variable bias signal to eliminate interference in a demodulated composite video signal in a television receiver.
Claim 14
Independent Claim
119 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, amplitude predistorting the frequency modulated visual carrier frequency signal in a complimentary mode to the slope of the video intermediate frequency circuit of a television receiver, amplitude modulating the frequency modulated and predistorted visual carrier frequency signal with a source of composite video signals, and transmitting the frequency and amplitude modulated visual carrier frequency signals.
Claim 15
Independent Claim
119 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, amplitude predistorting the frequency modulated visual carrier frequency signal in a complimentary mode to the slope of the video intermediate frequency circuit of a television receiver, amplitude modulating the frequency modulated and predistorted visual carrier frequency signal with a source of composite video signals, and transmitting the frequency and amplitude modulated visual carrier frequency signals.
Claim 16
Independent Claim
134 words
A method of compatibly and simtultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, adding a phase opposite correction signal to the composite video signals prior to amplitude modulating the frequency modulated visual carrier frequency signal such that amplitude variations which would occur in a television receiver due to the response characteristics of the receiver are preequalized, and transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 17
Independent Claim
134 words
A method of compatibly and simtultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, adding a phase opposite correction signal to the composite video signals prior to amplitude modulating the frequency modulated visual carrier frequency signal such that amplitude variations which would occur in a television receiver due to the response characteristics of the receiver are preequalized, and transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 18
Independent Claim
106 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, phase shifting and adding said selected audio tones to a composite video signal to produce a pre-equalized signal, amplitude modulating the frequency modulated visual carrier frequency signal with the pre-equalized signal, and transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 19
Independent Claim
106 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, phase shifting and adding said selected audio tones to a composite video signal to produce a pre-equalized signal, amplitude modulating the frequency modulated visual carrier frequency signal with the pre-equalized signal, and transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 20
Independent Claim
121 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, amplitude modulating in an amplitude modulator the frequency modulated visual carrier frequency signal with a source of composite video signals, applying a variable bias signal to the amplitude modulator, said variable bias signal being derived from the source of encoded signal with a leading phase shift, and transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 21
Independent Claim
121 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, amplitude modulating in an amplitude modulator the frequency modulated visual carrier frequency signal with a source of composite video signals, applying a variable bias signal to the amplitude modulator, said variable bias signal being derived from the source of encoded signal with a leading phase shift, and transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 22
Independent Claim
125 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with an audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 23
Independent Claim
125 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with an audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 24
Independent Claim
143 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with an audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 25
Independent Claim
143 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with an audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 26
Independent Claim
151 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, amplitude predistorting the frequency modulated visual carrier frequency signal in a complimentary mode to the slope of the video intermediate frequency circuits of a television receiver, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with an audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 27
Independent Claim
151 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, amplitude predistorting the frequency modulated visual carrier frequency signal in a complimentary mode to the slope of the video intermediate frequency circuits of a television receiver, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with an audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 28
Independent Claim
168 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, adding a phase opposite correction signal to the composite video signals prior to amplitude modulating the frequency modulated visual carrier frequency signal such that amplitude variations which would occur in a television receiver due to the response characteristics of the receiver are pre-equalized, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with an audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 29
Independent Claim
168 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, adding a phase opposite correction signal to the composite video signals prior to amplitude modulating the frequency modulated visual carrier frequency signal such that amplitude variations which would occur in a television receiver due to the response characteristics of the receiver are pre-equalized, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with an audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 30
Independent Claim
139 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, phase shifting and adding the encoded signal to a composite video signal to produce a pre-equalized signal, amplitude modulating the frequency modulated visual carrier frequency signal with the pre-equalized signal, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with an audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 31
Independent Claim
139 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, phase shifting and adding the encoded signal to a composite video signal to produce a pre-equalized signal, amplitude modulating the frequency modulated visual carrier frequency signal with the pre-equalized signal, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with an audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 32
Independent Claim
154 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, amplitude modulating in an amplitude modulator the frequency modulated visual carrier frequency signal with a source of composite video signals, applying a variable bias signal to the amplitude modulator, said variable bias signal being derived from said selected audio tones with a leading phase shift, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with an audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 33
Independent Claim
154 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, amplitude modulating in an amplitude modulator the frequency modulated visual carrier frequency signal with a source of composite video signals, applying a variable bias signal to the amplitude modulator, said variable bias signal being derived from said selected audio tones with a leading phase shift, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with an audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 34
Independent Claim
169 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, amplitude predistorting the frequency modulated visual carrier frequency signal in a complimentary mode to the slope of the video intermediate frequency circuits of a television receiver, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with a audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 35
Independent Claim
169 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, amplitude predistorting the frequency modulated visual carrier frequency signal in a complimentary mode to the slope of the video intermediate frequency circuits of a television receiver, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with a audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 36
Independent Claim
187 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier signal of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, adding a phase opposite correction signal to the composite video signals prior to amplitude modulating the frequency modulated visual carrier frequency signal such that amplitude variations which would occur in a television receiver due to the response characteristics of the receiver are preequalized, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with an audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 37
Independent Claim
187 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier signal of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, adding a phase opposite correction signal to the composite video signals prior to amplitude modulating the frequency modulated visual carrier frequency signal such that amplitude variations which would occur in a television receiver due to the response characteristics of the receiver are preequalized, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with an audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 38
Independent Claim
159 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising the steps of generating a visual carrier requency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, phase shifting and adding said selected audio tones to a composite video signal to produce a pre-equalized signal, amplitude modulating the frequency modulated visual carrier frequency signal with the pre-equalized signal, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with an audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to a produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 39
Independent Claim
159 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising the steps of generating a visual carrier requency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, phase shifting and adding said selected audio tones to a composite video signal to produce a pre-equalized signal, amplitude modulating the frequency modulated visual carrier frequency signal with the pre-equalized signal, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with an audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to a produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 40
Independent Claim
172 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, amplitude modulating in an amplitude modulator the frequency modulated visual carrier frequency signal with a source of composite video signals, applying a variable bias signal to the amplitude modulator, said variable bias signal being derived from said selected audio tones with a leading phase shift, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with an audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 41
Independent Claim
172 words
A method of compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, amplitude modulating in an amplitude modulator the frequency modulated visual carrier frequency signal with a source of composite video signals, applying a variable bias signal to the amplitude modulator, said variable bias signal being derived from said selected audio tones with a leading phase shift, generating an aural carrier frequency signal, frequency modulating the aural carrier frequency signal with an audio signal, mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 42
Independent Claim
129 words
A method of compatibly and simultaneously transmitting and receiving an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals such that the frequency and amplitude modulated visual carrier frequency signal is pre-equalized to compensate for amplitude variation which would occur in a television receiver due to the response characteristics of the receiver, transmitting the frequency and amplitude modulated visual carrier frequency signal, receiving the transmitted signal, and detecting the narrow band frequency modulation of said visual carrier frequency signal to reproduce the encoded signal.
Claim 43
Independent Claim
129 words
A method of compatibly and simultaneously transmitting and receiving an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals such that the frequency and amplitude modulated visual carrier frequency signal is pre-equalized to compensate for amplitude variation which would occur in a television receiver due to the response characteristics of the receiver, transmitting the frequency and amplitude modulated visual carrier frequency signal, receiving the transmitted signal, and detecting the narrow band frequency modulation of said visual carrier frequency signal to reproduce the encoded signal.
Claim 44
Independent Claim
145 words
A method of compatibly and simultaneously transmitting and receiving an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals such that the frequency and amplitude modulated visual carrier frequency signal is pre-equalized to compensate for amplitude variation which would occur in a television receiver due to the response characteristics of the receiver, transmitting the frequency and amplitude modulated visual carrier frequency signal, receiving the transmitted signal, and detecting the frequency modulation of said visual carrier frequency signal to reproduce the encoded signal.
Claim 45
Independent Claim
145 words
A method of compatibly and simultaneously transmitting and receiving an encoded signal with the normal visual carrier of a television signal comprising the steps of generating a visual carrier frequency signal, frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals such that the frequency and amplitude modulated visual carrier frequency signal is pre-equalized to compensate for amplitude variation which would occur in a television receiver due to the response characteristics of the receiver, transmitting the frequency and amplitude modulated visual carrier frequency signal, receiving the transmitted signal, and detecting the frequency modulation of said visual carrier frequency signal to reproduce the encoded signal.
Claim 46
Independent Claim
24 words
The method of transmitting and receiving as recited in claims 22 or 23, further comprising the step of aurally reproducing the detected encoded signal.
Claim 47
Independent Claim
23 words
The method of transmitting and receiving as recited in claims 22 or 23 further comprising the step of decoding the detected encoded signal.
Claim 48
Independent Claim
23 words
The method of transmitting and receiving as recited in claims 22 or 23, further comprising tbe step of displaying the detected encoded signal.
Claim 49
Independent Claim
23 words
The method of transmitting and receiving as recited in claims 22 or 23, further comprising the step of recording the detected encoded signal.
Claim 50
Independent Claim
28 words
The method of transmitting and receiving as recited in claims 22 or 23, further comprising the steps of decoding the detected encoded signal, and displaying the decoded signal.
Claim 51
Independent Claim
27 words
The method of transmitting and receiving recited in claims 22 or 23, further comprising the steps of decoding the detected encoded signal, and recording the decoded signal.
Claim 52
Dependent Claim
69 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for amplitude modulating the frequency modulated video signals, and means for transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 53
Dependent Claim
69 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for amplitude modulating the frequency modulated video signals, and means for transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 54
Dependent Claim
96 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, means for amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, and means for transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 55
Dependent Claim
96 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, means for amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, and means for transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 56
Dependent Claim
108 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for amplitude predistorting the frequency modulated visual carrier frequency signal in a complimentary mode to the slope of the video intermediate frequency circuit of a television receiver, means for amplitude modulating the frequency modulated and predistorted visual carrier frequency signal with a source of composite video signals, and means for transmitting the frequency and amplitude modulated visual carrier frequency signals.
Claim 57
Dependent Claim
108 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for amplitude predistorting the frequency modulated visual carrier frequency signal in a complimentary mode to the slope of the video intermediate frequency circuit of a television receiver, means for amplitude modulating the frequency modulated and predistorted visual carrier frequency signal with a source of composite video signals, and means for transmitting the frequency and amplitude modulated visual carrier frequency signals.
Claim 58
Dependent Claim
123 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, means for adding a phase opposite correction signal to the composite video signals prior to amplitude modulating the frequency modulated visual carrier frequency signal such that amplitude variations which would occur in a television receiver due to the response characteristics of the receiver are pre-equalized, and means for transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 59
Dependent Claim
123 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, means for adding a phase opposite correction signal to the composite video signals prior to amplitude modulating the frequency modulated visual carrier frequency signal such that amplitude variations which would occur in a television receiver due to the response characteristics of the receiver are pre-equalized, and means for transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 60
Dependent Claim
94 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for phase shifting and adding the encoded signal to a composite video signal to produce a pre-equalized signal, means for amplitude modulating the frequency modulated visual carrier frequency signal with the pre-equalized signal, and means for transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 61
Dependent Claim
94 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for phase shifting and adding the encoded signal to a composite video signal to produce a pre-equalized signal, means for amplitude modulating the frequency modulated visual carrier frequency signal with the pre-equalized signal, and means for transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 62
Dependent Claim
110 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for amplitude modulating in an amplitude modulator the frequency modulated visual carrier frequency signal with a source of composite video signals, means for applying a variable bias signal to the amplitude modulator, said variable bias signal being derived from the source of encoded signal with a leading phase shift, and means for transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 63
Dependent Claim
110 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for amplitude modulating in an amplitude modulator the frequency modulated visual carrier frequency signal with a source of composite video signals, means for applying a variable bias signal to the amplitude modulator, said variable bias signal being derived from the source of encoded signal with a leading phase shift, and means for transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 64
Dependent Claim
126 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies with are substantially different than multiples of the television vertical sweep frequency, means for amplitude predistorting the frequency modulated visual carrier frequency signal in a complimentary mode to the slope of the video intermediate frequency circuit of a television receiver, means for amplitude modulating the frequency modulated and predistorted visual carrier frequency signal with a source of composite video signals, and means for transmitting the frequency and amplitude modulated visual carrier frequency signals.
Claim 65
Dependent Claim
126 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies with are substantially different than multiples of the television vertical sweep frequency, means for amplitude predistorting the frequency modulated visual carrier frequency signal in a complimentary mode to the slope of the video intermediate frequency circuit of a television receiver, means for amplitude modulating the frequency modulated and predistorted visual carrier frequency signal with a source of composite video signals, and means for transmitting the frequency and amplitude modulated visual carrier frequency signals.
Claim 66
Dependent Claim
141 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, means for amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, means for adding a phase opposite correction signal to the composite video signals prior to amplitude modulating the frequency modulated visual carrier frequency signal such that amplitude variations which would occur in a television receiver due to the response characteristics of the receiver are pre-equalized, and means for transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 67
Dependent Claim
141 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, means for amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, means for adding a phase opposite correction signal to the composite video signals prior to amplitude modulating the frequency modulated visual carrier frequency signal such that amplitude variations which would occur in a television receiver due to the response characteristics of the receiver are pre-equalized, and means for transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 68
Dependent Claim
113 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, means for phase shifting and adding said selected audio tones to a composite video signal to produce a pre-equalized signal, means for amplitude modulating the frequency modulated visual carrier frequency signal with the pre-equalized signal, and means for transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 69
Dependent Claim
113 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, means for phase shifting and adding said selected audio tones to a composite video signal to produce a pre-equalized signal, means for amplitude modulating the frequency modulated visual carrier frequency signal with the pre-equalized signal, and means for transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 70
Dependent Claim
127 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, means for amplitude modulating an amplitude modulator the frequency modulated visual carrier frequency signal with a source of composite video signals, means for applying a variable bias signal to the amplitude modulator, said variable bias signal being derived from the source of encoded signal with a leading phase shift, and means for transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 71
Dependent Claim
127 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, means for amplitude modulating an amplitude modulator the frequency modulated visual carrier frequency signal with a source of composite video signals, means for applying a variable bias signal to the amplitude modulator, said variable bias signal being derived from the source of encoded signal with a leading phase shift, and means for transmitting the frequency and amplitude modulated visual carrier frequency signal.
Claim 72
Dependent Claim
136 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 73
Dependent Claim
136 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 74
Dependent Claim
154 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, means for amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 75
Dependent Claim
154 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, means for amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 76
Dependent Claim
164 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for amplitude predistorting the frequency modulated visual carrier frequency signal in a complimentary mode to the slope of the video intermediate frequency circuits of a television receiver, means for amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 77
Dependent Claim
164 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for amplitude predistorting the frequency modulated visual carrier frequency signal in a complimentary mode to the slope of the video intermediate frequency circuits of a television receiver, means for amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 78
Dependent Claim
181 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, means for adding a phase opposite correction signal to the composite video signals prior to amplitude modulating the frequency modulated visual carrier frequency signal such that amplitude variations which would occur in a television receiver due to the response characteristics of the receiver are pre-equalized, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 79
Dependent Claim
181 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, means for adding a phase opposite correction signal to the composite video signals prior to amplitude modulating the frequency modulated visual carrier frequency signal such that amplitude variations which would occur in a television receiver due to the response characteristics of the receiver are pre-equalized, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 80
Dependent Claim
152 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for phase shifting and adding the encoded signal to a composite video signal to produce a pre-equalized signal, means for amplitude modulating the frequency modulated visual carrier frequency signal with the pre-equalized signal, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 81
Dependent Claim
152 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for phase shifting and adding the encoded signal to a composite video signal to produce a pre-equalized signal, means for amplitude modulating the frequency modulated visual carrier frequency signal with the pre-equalized signal, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 82
Dependent Claim
168 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for amplitude modulating in an amplitude modulator the frequency modulated visual carrier frequency signal with a source of composite video signals, means for applying a variable biase signal to the amplitude modulator, said variable bias signal being derived from the source of encoded signal with the leading phase shift, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 83
Dependent Claim
168 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal over a narrow bandwidth with a source of encoded signal, means for amplitude modulating in an amplitude modulator the frequency modulated visual carrier frequency signal with a source of composite video signals, means for applying a variable biase signal to the amplitude modulator, said variable bias signal being derived from the source of encoded signal with the leading phase shift, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 84
Dependent Claim
180 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiplies of the television vertical sweep frequency, means for amplitude predistorting the frequency modulated visual carrier frequency signal in a complimentary mode to the slope of the video intermediate frequency circuits of a television receiver, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 85
Dependent Claim
180 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiplies of the television vertical sweep frequency, means for amplitude predistorting the frequency modulated visual carrier frequency signal in a complimentary mode to the slope of the video intermediate frequency circuits of a television receiver, amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 86
Dependent Claim
199 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, means for amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, means for adding a phase opposite correction signal to the composite video signals prior to amplitude modulating the frequency modulated visual carrier frequency signal such that amplitude variations which would occur in a television receiver due to the response characteristics of the receiver are pre-equalized, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 87
Dependent Claim
199 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, means for amplitude modulating the frequency modulated visual carrier frequency signal with a source of composite video signals, means for adding a phase opposite correction signal to the composite video signals prior to amplitude modulating the frequency modulated visual carrier frequency signal such that amplitude variations which would occur in a television receiver due to the response characteristics of the receiver are pre-equalized, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 88
Dependent Claim
171 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, means for phase shifting and adding said selected audio tones to a composite video signal to produce a pre-equalized signal, means for amplitude modulating the frequency modulated visual carrier frequency signal with the pre-equalized signal, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 89
Dependent Claim
171 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, means for phase shifting and adding said selected audio tones to a composite video signal to produce a pre-equalized signal, means for amplitude modulating the frequency modulated visual carrier frequency signal with the pre-equalized signal, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 90
Dependent Claim
185 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, means for amplitude modulating in an amplitude modulator the frequency modulated visual carrier frequency signal with a source of composite video signals, means for applying a variable bias signal to the amplitude modulator, said variable bias signal being derived from said selected audio tones with a leading phase shift, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
Claim 91
Dependent Claim
185 words
A transmitter for compatibly and simultaneously transmitting an encoded signal with the normal visual and aural carrier of a television signal comprising: means for generating a visual carrier frequency signal, means for frequency modulating the visual carrier frequency signal with audio tones selected according to a source of encoded signal, said audio tones having frequencies which are substantially different than multiples of the television vertical sweep frequency, means for amplitude modulating in an amplitude modulator the frequency modulated visual carrier frequency signal with a source of composite video signals, means for applying a variable bias signal to the amplitude modulator, said variable bias signal being derived from said selected audio tones with a leading phase shift, means for generating an aural carrier frequency signal, means for frequency modulating the aural carrier frequency signal with an audio signal, means for mixing the frequency modulated visual carrier frequency and aural carrier frequency signals to produce a resultant frequency modulated aural carrier frequency signal, and means for combining and transmitting the frequency and amplitude modulated visual carrier frequency signal and the resultant frequency modulated aural carrier frequency signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |