Patent US5043812A successfully refreshed from Google Patents.
US5043812A
Expired / Lapsed
US
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TV signal transmission systems and methods
Assignee: Zenith Electronics LLC
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Filing: 1990-08-13
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Granted: 1991-08-27
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Expires: 2010-08-13
Abstract
Abstract A hybrid television signal of less transmission power or better signal to noise performance is made up by removing low frequency analog components from the video signal, digitizing them and sending them as data in non-active video portions of the transmitted signal. A two step hybridization process, with the first step removing the line averaged value of the video components of the video signal and the second step removing the remainder of the video components under 200 KHz, is described. Temporal filtering, signal pre-emphasis, compression, dispersal and double sideband suppressed carrier modulation about a centered carrier are disclosed for reducing peak signal amplitudes and for minimizing co-channel interference to and from NTSC signals. In an FM implementation, the benefits of the hybrid signal are realized as a reduction in bandwidth and consequent improved noise performance. The hybrid signal system is uniquely adapted to a high definition television signal in a limited frequency channel.
Inventors
- 👤 Richard W. Citta
- 👤 Ronald B. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:04
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/015; H04N19/00; H04N19/10; H04N19/169; H04N19/186; H04N7/08; H04N7/084; H04N7/085; H04N7/087; H04N7/088; H04N7/12; H04N7/127
Claims Analysis
Total Claims: 79
Claim 1
Independent Claim
57 words
A hybrid analog-digital method of operating a television signal transmission system comprising: developing a first analog signal comprising predominantly high frequency components of a baseband video signal; developing a digitally coded representation of a second signal comprising predominantly low frequency components of said baseband video signal; and transmitting said first analog signal and said digitally coded representation.
Claim 2
Dependent Claim
57 words
A hybrid analog-digital method of operating a television signal transmission system comprising: developing a first analog signal comprising predominantly high frequency components of a baseband video signal; developing a digitally coded representation of a second signal comprising predominantly low frequency components of said baseband video signal; and transmitting said first analog signal and said digitally coded representation.
Claim 3
Dependent Claim
22 words
The method of claim 1, further including the step of incorporating said digitally coded representation as data in said first analog signal.
Claim 4
Dependent Claim
48 words
The method of claim 2 wherein said second signal is representative of the line averaged value of the active video portion of each horizontal line in said baseband video signal and wherein said first analog signal is the difference between said second signal and said baseband video signal.
Claim 5
Dependent Claim
25 words
The method of claim 3, wherein said baseband video signal includes non-active video portions and wherein said data is included in said non-active video portions.
Claim 6
Dependent Claim
52 words
The method of claim 4, further including the steps of generating digital values corresponding to the line averaged values of each of said horizontal lines to form said data; and developing said first analog signal by converting said digital values into analog signals that are algebraically combined with said baseband video signal.
Claim 7
Dependent Claim
29 words
The method of claim 5 wherein said digital values have a predetermined resolution that leaves a relatively small residue of said low frequency components in said first analog signal.
Claim 8
Independent Claim
68 words
A method of operating a television signal transmission system comprising the steps of: developing a predominantly high frequency components video signal from a composite baseband video signal by subtracting a signal indicative of the low frequency components of said composite baseband video signal; developing a digitally coded representation of said low frequency components indicative signal; and transmitting said high frequency components video signal and said digitally coded representation.
Claim 9
Independent Claim
68 words
A method of operating a television signal transmission system comprising the steps of: developing a predominantly high frequency components video signal from a composite baseband video signal by subtracting a signal indicative of the low frequency components of said composite baseband video signal; developing a digitally coded representation of said low frequency components indicative signal; and transmitting said high frequency components video signal and said digitally coded representation.
Claim 10
Dependent Claim
65 words
The method of claim 7 wherein said low frequency components indicative signal comprises the average value of the active video portion of each horizontal line of said composite baseband video signal and wherein said digitally coded representation is in the form of digital data, and further including the step of: incorporating said digital data in non-active video portions of said high frequency components video signal.
Claim 11
Dependent Claim
27 words
The method of claim 8 wherein said composite baseband video signal includes horizontal blanking intervals and wherein said digital data is inserted in said horizontal blanking intervals.
Claim 12
Dependent Claim
29 words
The method of claim 9, further including the step of delaying said composite baseband video signal by one horizontal line prior to subtracting said low frequency components indicative signal.
Claim 13
Dependent Claim
51 words
The method of claim 10 wherein said digital data comprises the digital value of said low frequency components indicative signal, and further including the step of: generating an analog signal from said digital value and subtracting it from said composite baseband video signal to form said high frequency components video signal.
Claim 14
Dependent Claim
83 words
A television signal transmission system comprising: means producing a baseband video signal; means developing a low frequency components signal indicate of the line averaged value of active video in said baseband video signal; means combining said low frequency components signal with said baseband video signal to develop a high frequency components signal; means developing a digitally coded representation of said low frequency components signal; and means for modulating a carrier with said high frequency components signal and said digitally coded representation for transmission.
Claim 15
Dependent Claim
83 words
A television signal transmission system comprising: means producing a baseband video signal; means developing a low frequency components signal indicate of the line averaged value of active video in said baseband video signal; means combining said low frequency components signal with said baseband video signal to develop a high frequency components signal; means developing a digitally coded representation of said low frequency components signal; and means for modulating a carrier with said high frequency components signal and said digitally coded representation for transmission.
Claim 16
Dependent Claim
39 words
The system of claim 12, further including: line integrating means for developing said line averaged value of active video in said baseband video signal; and analog-to-digital converter means coupled to said integrating means for developing said digitally coded representation.
Claim 17
Dependent Claim
43 words
The system of claim 13, further including: delay means for delaying said baseband video signal by one horizontal line; and digital-to-analog converter means coupled to said analog-to-digital converter means for developing said low frequency components signal for combining with said baseband video signal.
Claim 18
Dependent Claim
77 words
The system of claim 12 wherein said baseband video signal is in digital form, and further including: means for determining the average digital value of the active video portion of each horizontal line of said digital baseband video signal; means for combining said average digital values with said digital baseband video signal to develop a digital high frequency components signal; and means for incorporating said average digital values as data in said digital high frequency components signal.
Claim 19
Dependent Claim
27 words
The system of claim 15, further including a digital-to-analog converter for converting said high frequency components digital signal and digital data into an analog signal for transmission.
Claim 20
Dependent Claim
57 words
A receiver for receiving a television signal including high frequency components of a video signal and a digitally coded representation of low frequency components of said video signal, comprising: means for generating an additional signal from said digitally coded representation; and means for combining said high frequency components with said additional signal to reconstruct said video signal.
Claim 21
Dependent Claim
57 words
A receiver for receiving a television signal including high frequency components of a video signal and a digitally coded representation of low frequency components of said video signal, comprising: means for generating an additional signal from said digitally coded representation; and means for combining said high frequency components with said additional signal to reconstruct said video signal.
Claim 22
Dependent Claim
24 words
The receiver of claim 17 wherein said digitally coded representation is of limited resolution and wherein said additional signal has the same limited resolution.
Claim 23
Dependent Claim
20 words
The receiver of claim 18 further including digital-to-analog converter means for converting said digitally coded representation into said additional signal.
Claim 24
Dependent Claim
33 words
The receiver of claim 19 wherein said television signal includes a reference signal, and further including means for detecting said reference signal and controlling the gain of said receiver as a function thereof.
Claim 25
Dependent Claim
72 words
A television signal transmission method comprising: developing a first signal representing the frequency components of the television signal below the horizontal scanning frequency thereof; developing a second signal representing the remaining frequency component of the television signal; and transmitting the first and second signals in different formats, the format for the first signal comprising a coded relatively low power utilization format including a digitally coded representation of said low frequency components signal.
Claim 26
Dependent Claim
72 words
A television signal transmission method comprising: developing a first signal representing the frequency components of the television signal below the horizontal scanning frequency thereof; developing a second signal representing the remaining frequency component of the television signal; and transmitting the first and second signals in different formats, the format for the first signal comprising a coded relatively low power utilization format including a digitally coded representation of said low frequency components signal.
Claim 27
Dependent Claim
50 words
A television signal transmission method comprising: developing first and second signals, respectively comprising frequency components of the television signal utilizing relatively low and high transmission power levels; digitally encoding the second signal for transmission in a relatively low power utilization format; and transmitting the first and digitally coded second signals.
Claim 28
Dependent Claim
50 words
A television signal transmission method comprising: developing first and second signals, respectively comprising frequency components of the television signal utilizing relatively low and high transmission power levels; digitally encoding the second signal for transmission in a relatively low power utilization format; and transmitting the first and digitally coded second signals.
Claim 29
Dependent Claim
79 words
A television signal transmission method comprisign: developing a first signal representing frequency component of the television signal having a relatively low picture detail content and a relatively high transmission power demand; developing a second signal representing frequency components of the television signal having a relatively high picture detail content and a relatively low transmission power demand; digitally coding the first signal for transmission in a relatively low power utilization format; and transmitting the second and digitally coded first signals.
Claim 30
Dependent Claim
79 words
A television signal transmission method comprisign: developing a first signal representing frequency component of the television signal having a relatively low picture detail content and a relatively high transmission power demand; developing a second signal representing frequency components of the television signal having a relatively high picture detail content and a relatively low transmission power demand; digitally coding the first signal for transmission in a relatively low power utilization format; and transmitting the second and digitally coded first signals.
Claim 31
Dependent Claim
108 words
A television transmission and reception system comprising: at a transmitter: means for developing a first signal comprising predominantly high frequency components of a baseband video signal; means for developing from a second signal comprising predominantly low frequency components of said baseband video signal a limited resolution digitally coded representation thereof; and means for transmitting said first signal and said digitally coded representation; at a receiver: means for receiving said first signal and said limited resolution digitally coded representation; means for regenerating said second signal from said limited resolution digitally coded representation; and means for combining said first signal and said second signal to reconstruct said baseband video signal.
Claim 32
Dependent Claim
108 words
A television transmission and reception system comprising: at a transmitter: means for developing a first signal comprising predominantly high frequency components of a baseband video signal; means for developing from a second signal comprising predominantly low frequency components of said baseband video signal a limited resolution digitally coded representation thereof; and means for transmitting said first signal and said digitally coded representation; at a receiver: means for receiving said first signal and said limited resolution digitally coded representation; means for regenerating said second signal from said limited resolution digitally coded representation; and means for combining said first signal and said second signal to reconstruct said baseband video signal.
Claim 33
Dependent Claim
22 words
The system of claim 24 wherein said limited resolution digitally coded representation is a digital value of a given number of bits.
Claim 34
Dependent Claim
44 words
The system of claim 25 wherein said second signal represents the lien averaged value of the active video of each horizontal line in said baseband video signal and wherein said first signal is the difference between said baseband video signal and said second signal.
Claim 35
Independent Claim
84 words
A method of operating a television signal transmission system comprising the steps of: developing a first signal comprising predominantly high frequency components of a baseband video signal; developing a digitally coded representation of a second signal comprising predominantly low frequency components of said baseband video signal such that the power required to transmit the coded low frequency components is very substantially less than the power required to transmit the same frequencies in uncoded form; and transmitting said first signal and said digitally coded representation.
Claim 36
Independent Claim
84 words
A method of operating a television signal transmission system comprising the steps of: developing a first signal comprising predominantly high frequency components of a baseband video signal; developing a digitally coded representation of a second signal comprising predominantly low frequency components of said baseband video signal such that the power required to transmit the coded low frequency components is very substantially less than the power required to transmit the same frequencies in uncoded form; and transmitting said first signal and said digitally coded representation.
Claim 37
Independent Claim
74 words
A method of operating a television signal transmission system comprising the steps of: developing a first signal comprising predominantly high frequency components of a baseband video signal; developing a digitally coded representation of a second signal comprising predominantly low frequency components of said baseband video signal; and transmitting said first signal and said digitally coded representation such that said digitally coded representation is transmitted with a small fraction of the total transmitted signal power.
Claim 38
Independent Claim
74 words
A method of operating a television signal transmission system comprising the steps of: developing a first signal comprising predominantly high frequency components of a baseband video signal; developing a digitally coded representation of a second signal comprising predominantly low frequency components of said baseband video signal; and transmitting said first signal and said digitally coded representation such that said digitally coded representation is transmitted with a small fraction of the total transmitted signal power.
Claim 39
Dependent Claim
91 words
A hybrid analog-digital television signal transmission and reception method comprising: developing a first analog signal comprising a first band of frequency components of a baseband video signal; developing a digitally coded representation of a second signal comprising a second band of frequency components of said baseband video signal; transmitting said first analog signal and said digitally coded representation of said second signal; receiving said first analog signal and said digitally coded representation of said second signal; and regenerating said second signal and combining the resulting signal with said first analog signal.
Claim 40
Dependent Claim
91 words
A hybrid analog-digital television signal transmission and reception method comprising: developing a first analog signal comprising a first band of frequency components of a baseband video signal; developing a digitally coded representation of a second signal comprising a second band of frequency components of said baseband video signal; transmitting said first analog signal and said digitally coded representation of said second signal; receiving said first analog signal and said digitally coded representation of said second signal; and regenerating said second signal and combining the resulting signal with said first analog signal.
Claim 41
Dependent Claim
22 words
The method of claim 29, further including the step of incorporating said digitally coded representation as data in said first analog signal.
Claim 42
Dependent Claim
48 words
The method of claim 30 wherein said second signal is representative of the line averaged value of the active video portion of each horizontal line in said baseband video signal and wherein said first analog signal is the difference between said second signal and said baseband video signal.
Claim 43
Dependent Claim
25 words
The method of claim 32, wherein said baseband video signal includes non-active video portions and wherein said data is included in said non-active video portions.
Claim 44
Dependent Claim
49 words
The method of claim 29, further including generating digital values corresponding to the line averaged values of each of said horizontal lines to form said data; and developing said first analog signal by converting said digital values into analog signals that are algebraically combined with said baseband video signal.
Claim 45
Dependent Claim
29 words
The method of claim 33 wherein said digital values have a predetermined resolution that leaves a relatively small residue of said low frequency components in said first analog signal.
Claim 46
Dependent Claim
61 words
A hybrid analog-digital receiver for receiving a television signal including analog high frequency components of a video signal and a digitally coded representation of low frequency components of said video signal, comprising: means for generating an additional signal from said digitally coded representation; and means for combining said analog high frequency components with said additional signal to reconstruct said video signal.
Claim 47
Dependent Claim
61 words
A hybrid analog-digital receiver for receiving a television signal including analog high frequency components of a video signal and a digitally coded representation of low frequency components of said video signal, comprising: means for generating an additional signal from said digitally coded representation; and means for combining said analog high frequency components with said additional signal to reconstruct said video signal.
Claim 48
Dependent Claim
24 words
The receiver of claim 35 wherein said digitally coded representation is of limited resolution and wherein said additional signal has the same limited resolution.
Claim 49
Dependent Claim
20 words
The receiver of claim 35 further including digital-to-analog converter means for converting said digitally coded representation into said additional signal.
Claim 50
Dependent Claim
33 words
The receiver of claim 37 wherein said television signal includes a reference signal, and further including means for detecting said reference signal and controlling the gain of said receiver as a function thereof.
Claim 51
Dependent Claim
91 words
A television signal transmission and reception method comprising; developing a first signal representing higher frequency components of a television signal; developing a second signal representing low frequency components of the television signal below the horizontal scanning frequency thereof; transmitting the firs and second signals in different formats the format for the second signal comprising a coded relatively low power utilization format including a digitally coded representation of said low frequency components; receiving said first and second signals; and decoding said digitally coded representation and combining the result with said first signal.
Claim 52
Dependent Claim
91 words
A television signal transmission and reception method comprising; developing a first signal representing higher frequency components of a television signal; developing a second signal representing low frequency components of the television signal below the horizontal scanning frequency thereof; transmitting the firs and second signals in different formats the format for the second signal comprising a coded relatively low power utilization format including a digitally coded representation of said low frequency components; receiving said first and second signals; and decoding said digitally coded representation and combining the result with said first signal.
Claim 53
Dependent Claim
74 words
A television signal transmission and reception method comprising; developing analog first and digital second signals, respectively comprising frequency components of the television signal utilizing the relatively low and high transmission power levels; digitally coding the second signal for transmission in a relatively low power utilization format; transmitting the first and digitally coded second signals; receiving said first and second signals; and decoding said digitally coded representation and combing the result with said first signal.
Claim 54
Dependent Claim
74 words
A television signal transmission and reception method comprising; developing analog first and digital second signals, respectively comprising frequency components of the television signal utilizing the relatively low and high transmission power levels; digitally coding the second signal for transmission in a relatively low power utilization format; transmitting the first and digitally coded second signals; receiving said first and second signals; and decoding said digitally coded representation and combing the result with said first signal.
Claim 55
Dependent Claim
103 words
A hybrid analog-digital television signal transmission and reception method comprising: developing a first signal representing frequency components of the television signal having a relatively low picture detail content an a relatively high transmission power demand; developing a second analog signal representing frequency components of the television signal having a relatively high picture detail content and a relatively low transmission power demand; digitally coding the first signal for transmission in a relatively low power utilization format; transmitting the analog second and digitally coded first signals; receiving said firs and second signals; and decoding said first signal and combining the result with said second signal.
Claim 56
Dependent Claim
103 words
A hybrid analog-digital television signal transmission and reception method comprising: developing a first signal representing frequency components of the television signal having a relatively low picture detail content an a relatively high transmission power demand; developing a second analog signal representing frequency components of the television signal having a relatively high picture detail content and a relatively low transmission power demand; digitally coding the first signal for transmission in a relatively low power utilization format; transmitting the analog second and digitally coded first signals; receiving said firs and second signals; and decoding said first signal and combining the result with said second signal.
Claim 57
Independent Claim
95 words
A method of processing a television signal for transmission at drastically reduced power levels, comprising: removing from the television signal at least a portion of the energy in selected frequency components of the signal which represent low picture detail, said selected frequency components constituting a small part of the overall television signal bandwidth, but containing a majority of the overall television signal energy; developing a digital signal representing a digital encoding of the selected frequency components; and developing an analog second signal representing other frequency components of the television signal which represent high picture detail.
Claim 58
Independent Claim
95 words
A method of processing a television signal for transmission at drastically reduced power levels, comprising: removing from the television signal at least a portion of the energy in selected frequency components of the signal which represent low picture detail, said selected frequency components constituting a small part of the overall television signal bandwidth, but containing a majority of the overall television signal energy; developing a digital signal representing a digital encoding of the selected frequency components; and developing an analog second signal representing other frequency components of the television signal which represent high picture detail.
Claim 59
Dependent Claim
21 words
The method defined by claim 42 wherein said selected frequency components having a bandwidth on the order of hundreds of kiloHertz.
Claim 60
Dependent Claim
87 words
A hybrid digital-analog method of transmitting and receiving an information signal, comprising: removing from the information signal at least a portion of the energy in selected frequency components of the signal requiring relatively high transmission power; developing a digital signal representing a digital encoding of the selected frequency components; transmitting the information signal in analog form; transmitting the digital signal characterizing the selected frequency components; receiving the analog information signal and the digital signal; and decoding the digital signal and combining it with the analog information signal.
Claim 61
Dependent Claim
87 words
A hybrid digital-analog method of transmitting and receiving an information signal, comprising: removing from the information signal at least a portion of the energy in selected frequency components of the signal requiring relatively high transmission power; developing a digital signal representing a digital encoding of the selected frequency components; transmitting the information signal in analog form; transmitting the digital signal characterizing the selected frequency components; receiving the analog information signal and the digital signal; and decoding the digital signal and combining it with the analog information signal.
Claim 62
Dependent Claim
21 words
The method defined by claim 44 wherein said selected frequency components having a bandwidth on the order of hundreds of kiloHertz.
Claim 63
Independent Claim
126 words
A method of transmitting and receiving a television signal at significantly reduced average power levels, comprising: removing from the television signal at least a portion of the energy in selected frequency components of the signal which represent low picture detail, said selected frequency components constituting a small part of the overall television signal bandwidth, but containing a majority of the overall television signal energy and requiring relatively high transmission power; developing a digital signal representing a digital encoding of the selected frequency components; transmitting a second signal representing other frequency components of the television signal which represent high picture detail; transmitting the digital signal characterizing the selected frequency components; receiving the second signal and the digital signal; and combining the digital signal with the second signal.
Claim 64
Independent Claim
126 words
A method of transmitting and receiving a television signal at significantly reduced average power levels, comprising: removing from the television signal at least a portion of the energy in selected frequency components of the signal which represent low picture detail, said selected frequency components constituting a small part of the overall television signal bandwidth, but containing a majority of the overall television signal energy and requiring relatively high transmission power; developing a digital signal representing a digital encoding of the selected frequency components; transmitting a second signal representing other frequency components of the television signal which represent high picture detail; transmitting the digital signal characterizing the selected frequency components; receiving the second signal and the digital signal; and combining the digital signal with the second signal.
Claim 65
Dependent Claim
19 words
The method defined by claim 46 wherein said digital signal is transmitted during inactive portions of the television signal.
Claim 66
Dependent Claim
21 words
The method defined by claim 46 wherein said selected frequency components has a bandwidth on the order of hundreds of kiloHertz.
Claim 67
Independent Claim
155 words
A method of transmitting and receiving a television signal at drastically reduced average power levels, comprising: removing from the television signal at least a portion of the energy in selected frequency components of the signal which represent low picture detail, said selected frequency component constituting a small part of the overall television signal bandwidth, but containing a majority of the overall television signal energy and normally requiring relatively high transmission power; developing a digital signal representing a digital encoding of the selected frequency components; transmitting a second signal representing other frequency components of the television signal which represent high picture detail; transmitting the digital signal characterizing the selected frequency components at very low average power levels compared to the average power required to transmit said selected frequency components in analog form and to the overall transmitted signal power; receiving the second signal and the digital signal; and combining the digital signal with the second signal.
Claim 68
Independent Claim
155 words
A method of transmitting and receiving a television signal at drastically reduced average power levels, comprising: removing from the television signal at least a portion of the energy in selected frequency components of the signal which represent low picture detail, said selected frequency component constituting a small part of the overall television signal bandwidth, but containing a majority of the overall television signal energy and normally requiring relatively high transmission power; developing a digital signal representing a digital encoding of the selected frequency components; transmitting a second signal representing other frequency components of the television signal which represent high picture detail; transmitting the digital signal characterizing the selected frequency components at very low average power levels compared to the average power required to transmit said selected frequency components in analog form and to the overall transmitted signal power; receiving the second signal and the digital signal; and combining the digital signal with the second signal.
Claim 69
Dependent Claim
19 words
The method described by claim 49 wherein said digital signal is transmitted during inactive portions of the television signal.
Claim 70
Dependent Claim
21 words
The method defined by claim 49 wherein said selected frequency components having a bandwidth on the order of hundreds of kiloHertz.
Claim 71
Dependent Claim
170 words
A hybrid digital-analog method of transmitting and receiving an analog television signal at drastically reduced average power levels, comprising: removing from the television signal at least a portion of the energy in selected frequency components of the signal which represent low picture detail, said selected frequency components constituting a small part of the overall television signal bandwidth, but containing a majority of the overall television signal energy and normally required relatively high transmission power; developing a digital signal representing a digital encoding of the selected frequency components; transmitting in an analog form a second signal representing other frequency components of the television signal which represent high picture detail; transmitting the digital signal characterizing the selected frequency components at very low average power levels compared to the average power required to transmit said selected frequency components in analog form and to the overall transmitted signal power; receiving the analog second signal and the digital signal; and converting the digital signal to analog form and combining it with the analog second signal.
Claim 72
Dependent Claim
170 words
A hybrid digital-analog method of transmitting and receiving an analog television signal at drastically reduced average power levels, comprising: removing from the television signal at least a portion of the energy in selected frequency components of the signal which represent low picture detail, said selected frequency components constituting a small part of the overall television signal bandwidth, but containing a majority of the overall television signal energy and normally required relatively high transmission power; developing a digital signal representing a digital encoding of the selected frequency components; transmitting in an analog form a second signal representing other frequency components of the television signal which represent high picture detail; transmitting the digital signal characterizing the selected frequency components at very low average power levels compared to the average power required to transmit said selected frequency components in analog form and to the overall transmitted signal power; receiving the analog second signal and the digital signal; and converting the digital signal to analog form and combining it with the analog second signal.
Claim 73
Independent Claim
74 words
A method of processing an analog information signal from which has been removed at lest a portion of the energy in selected frequency components requiring relatively high transmission power, the removed selected frequency components being included in the analog information signal as a digitally encoded representation, said method comprising: receiving the analog information signal and the digitally encoded representation; decoding the digitally encoded representation; and combining the decoded representation with the analog information signal.
Claim 74
Independent Claim
74 words
A method of processing an analog information signal from which has been removed at lest a portion of the energy in selected frequency components requiring relatively high transmission power, the removed selected frequency components being included in the analog information signal as a digitally encoded representation, said method comprising: receiving the analog information signal and the digitally encoded representation; decoding the digitally encoded representation; and combining the decoded representation with the analog information signal.
Claim 75
Dependent Claim
32 words
The method defined by claim 53 wherein said analog information signal has a bandwidth in magaHertz, and wherein said selected frequency components have a bandwidth on the order of hundreds of kiloHertz.
Claim 76
Independent Claim
111 words
A method of processing a television signal from which has been removed at lest a portion of the energy in selected frequency components representing low picture detail to provide an analog television signal, the selected frequency components constituting a small part of the overall television signal bandwidth, but containing a majority of the overall television signal energy, the removed selected frequency components being included in the analog television signal as a digitally encoded representation, said method comprising: receiving the analog television signal and the digitally encoded representation of the selected frequency components removed from the television signal; decoding the digitally encoded representation; and combining the representation with the analog television signal.
Claim 77
Independent Claim
111 words
A method of processing a television signal from which has been removed at lest a portion of the energy in selected frequency components representing low picture detail to provide an analog television signal, the selected frequency components constituting a small part of the overall television signal bandwidth, but containing a majority of the overall television signal energy, the removed selected frequency components being included in the analog television signal as a digitally encoded representation, said method comprising: receiving the analog television signal and the digitally encoded representation of the selected frequency components removed from the television signal; decoding the digitally encoded representation; and combining the representation with the analog television signal.
Claim 78
Dependent Claim
18 words
The method defined by claim 55 wherein said digitally encoded representation occupies inactive portions of the television signal.
Claim 79
Dependent Claim
21 words
The method defined by claim 55 wherein said selected frequency components having a bandwidth on the order of hundreds of kiloHertz.
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USPTO Annuity & Maintenance Windows
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| 3.5 Years (Year 4) | 1994-08-26 | 1995-02-25 | 1995-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-26 | 1999-02-25 | 1999-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-26 | 2003-02-25 | 2003-08-27 | $7700.00 | Window Closed / Lapsed |