US3639840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multicarrier transmission system
Assignee: SPENCER KENNEDY LAB Inc
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Filing: 1969-11-28
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Granted: 1972-02-01
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Expires: 1989-11-28
Abstract
Abstract A converter for use in a cable television system and interconnected between a transmission path and a television receiver for selecting any one of a plurality of television signals carried by the transmission path. The converter includes a broadband section for translating all received television signals to intermediate frequencies higher than the frequencies of the received television signals such that no images appear within the band of input signals. A selected one of the television signals at a predetermined higher intermediate frequency is then translated by a narrow band section to a lower frequency of a predetermined television channel for reception by the television receiver.
Inventors
- 👤 Jacob Shekel
- 👤 George H Ray Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:27
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/12; H03; H03B; H03B5/00; H03B5/08; H03B5/12; H03B5/1203; H03B5/1231; H03B5/1237; H03B5/124; H03B5/1243; H03D; H03D7/00; H03D7/16; H03D7/161; H04N; H04N7/00; H04N7/10; H03D7/12
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
118 words
A converter adapted to be interconnected between a transmission path and a television receiver for selecting any one of a plurality of television signals carried by said transmission path and for converting the selected signal to a predetermined channel for application to said receiver, said converter comprising: broadband means adapted for coupling to said transmission path and operative to simultaneously translate said plurality of television signals to intermediate frequencies higher than the frequencies of said television signals; means for selecting one of said television signals at a predetermined one of said higher intermediate frequencies; and narrow band means for translating said selected television signal at said predetermined intermediate frequency to the lower frequency of a predetermined television channel.
Claim 2
Dependent Claim
118 words
A converter adapted to be interconnected between a transmission path and a television receiver for selecting any one of a plurality of television signals carried by said transmission path and for converting the selected signal to a predetermined channel for application to said receiver, said converter comprising: broadband means adapted for coupling to said transmission path and operative to simultaneously translate said plurality of television signals to intermediate frequencies higher than the frequencies of said television signals; means for selecting one of said television signals at a predetermined one of said higher intermediate frequencies; and narrow band means for translating said selected television signal at said predetermined intermediate frequency to the lower frequency of a predetermined television channel.
Claim 3
Dependent Claim
21 words
A converter according to claim 1 wherein said broadband means has a bandwidth sufficient to process said plurality of television signals.
Claim 4
Dependent Claim
50 words
A converter according to claim 1 wherein said broadband means includes a broadband mixer and a voltage tuned oscillator and said selection means includes voltage selection means for applying a selected control voltage to said oscillator to cause said mixer to produce a selected television signal at said intermediate frequency.
Claim 5
Dependent Claim
35 words
A converter according to claim 3 wherein said broadband means includes a broadband amplifier and said voltage selection means includes a voltage divider and switching means for applying a selected control voltage to said oscillator.
Claim 6
Dependent Claim
38 words
A converter according to claim 3 herein said voltage selection means includes a voltage divider, a source of reference voltage for said divider and a multiposition switch manually operable to apply a selected control voltage to said oscillator.
Claim 7
Dependent Claim
63 words
A converter according to claim 5 wherein said narrow band means includes an IF filter, an IF amplifier, a narrow band mixer, and a fixed frequency oscillator for applying a local oscillator signal of higher frequency than said television signals to said narrow band mixer to cause said narrow band mixer to produce said selected television signal at said predetermined television channel frequency.
Claim 8
Dependent Claim
29 words
A converter according to claim 4 including a low pass filter coupled to said broadband amplifier and adapted to receive said plurality of television signals from said transmission path.
Claim 9
Dependent Claim
173 words
For use in a cable television wherein a plurality of television signals are transmitted on a common transmission path, a converter adapted for interconnection between said transmission path and a television receiver comprising: broadband means for simultaneously translating said television signals to intermediate frequencies higher than the frequencies of said television signals and including a broadband mixer, and a voltage tuned oscillator; voltage selection means for applying a selected control voltage to said oscillator to cause said mixer to produce a selected television signal at a predetermined one of said higher intermediate frequencies; and narrow band means for translating said selected television signal at said predetermined intermediate frequency to the lower frequency of a predetermined television channel, said narrow band means including an IF filter, an IF amplifier, a narrow band mixer, and a fixed frequency oscillator for applying a local oscillator signal of higher frequency than said television signals to said narrow band mixer to cause said narrow band mixer to produce said selected television signal at said predetermined television channel frequency.
Claim 10
Dependent Claim
173 words
For use in a cable television wherein a plurality of television signals are transmitted on a common transmission path, a converter adapted for interconnection between said transmission path and a television receiver comprising: broadband means for simultaneously translating said television signals to intermediate frequencies higher than the frequencies of said television signals and including a broadband mixer, and a voltage tuned oscillator; voltage selection means for applying a selected control voltage to said oscillator to cause said mixer to produce a selected television signal at a predetermined one of said higher intermediate frequencies; and narrow band means for translating said selected television signal at said predetermined intermediate frequency to the lower frequency of a predetermined television channel, said narrow band means including an IF filter, an IF amplifier, a narrow band mixer, and a fixed frequency oscillator for applying a local oscillator signal of higher frequency than said television signals to said narrow band mixer to cause said narrow band mixer to produce said selected television signal at said predetermined television channel frequency.
Claim 11
Dependent Claim
14 words
A converter according to claim 8 wherein said transmission path is a wideband cable.
Claim 12
Dependent Claim
18 words
A converter according to claim 9 wherein said television signals are each different from standard television broadcast frequencies.
Claim 13
Independent Claim
234 words
A system for transmitting a plurality of television signals a common transmission path comprising: means operative to simultaneously receive a plurality of television signals; means operative in response to the received television signals to provide a plurality of television signals, the frequency of each being a different odd multiple of a reference frequency; a plurality of mixers each associated with a respective receiver; a master oscillator for providing a signal of a reference frequency; a harmonic generator operative in response to said reference frequency signal to provide a predetermined harmonic spectrum; a plurality of filters coupled to said harmonic generator and each associated with a respective mixer and each being selectively tuned to provide an output signal to a respective mixer to cause said mixer to provide a television signal of a frequency which is a different odd multiple of said reference frequency; a network for combining said television signals for application to a common transmission path; and means for converting said television signals to the frequency of a predetermined television channel, said conversion means including: broadband means for translating said plurality of television signals to intermediate frequencies higher than the frequencies of said television signals; voltage switching means for selecting one of said television signals at a predetermined one of said higher intermediate frequencies; and narrow band means for translating said selected television signal to the lower frequency of a predetermined television channel.
Claim 14
Independent Claim
234 words
A system for transmitting a plurality of television signals a common transmission path comprising: means operative to simultaneously receive a plurality of television signals; means operative in response to the received television signals to provide a plurality of television signals, the frequency of each being a different odd multiple of a reference frequency; a plurality of mixers each associated with a respective receiver; a master oscillator for providing a signal of a reference frequency; a harmonic generator operative in response to said reference frequency signal to provide a predetermined harmonic spectrum; a plurality of filters coupled to said harmonic generator and each associated with a respective mixer and each being selectively tuned to provide an output signal to a respective mixer to cause said mixer to provide a television signal of a frequency which is a different odd multiple of said reference frequency; a network for combining said television signals for application to a common transmission path; and means for converting said television signals to the frequency of a predetermined television channel, said conversion means including: broadband means for translating said plurality of television signals to intermediate frequencies higher than the frequencies of said television signals; voltage switching means for selecting one of said television signals at a predetermined one of said higher intermediate frequencies; and narrow band means for translating said selected television signal to the lower frequency of a predetermined television channel.
Claim 15
Dependent Claim
62 words
A system according to claim 11 wherein said conversion means comprises: broadband means for translating said television signals to a higher intermediate frequency and including broadband mixer and a voltage tuned oscillator and said voltage switching means includes means for applying a selected control voltage to said oscillator to cause said mixer to produce a selected television signal at said intermediate frequency.
Claim 16
Dependent Claim
28 words
A system according to claim 12 wherein said voltage switching means includes a voltage divider and a multiposition switch for applying a selected control voltage to said oscillator.
Claim 17
Dependent Claim
63 words
A system according to claim 13 wherein said narrow band means includes an IF filter, an If amplifier, a narrow band mixer, and a fixed frequency oscillator for applying a local oscillator signal of higher frequency than said television signals to said narrow band mixer to cause said narrow band mixer to produce said selected television signal at said predetermined television channel frequency.
Claim 18
Dependent Claim
21 words
A system according to claim 11 wherein said plurality of television signals are of different frequencies than standard television broadcast frequencies.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |