US5287180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modulator/demodulater for compatible high definition television system
Assignee: General Electric Co
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Filing: 1991-02-04
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Granted: 1994-02-15
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Expires: 2011-02-04
Abstract
Abstract An NTSC bandwidth-compatible HDTV system employs multiple quadrature amplitude modulation (QAM). A first suppressed QAM carrier is modulated with high priority information including predominantly low frequency information. A second suppressed QAM carrier is modulated with low priority information including predominantly high frequency information. The high priority QAM signal exhibits a larger amplitude and narrower bandwidth than the low priority QAM signal, and is disposed in the lower portion of the multiple QAM frequency spectrum normally occupied by the vestigial sideband of a standard NTSC television signal. The frequency spectrum of the multiple QAM signal exhibits signal attenuation at frequencies associated with high energy information in a standard NTSC signal, e.g., frequencies around the NTSC picture and sound carriers.
Inventors
- 👤 Hugh E. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:09
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/32; H04L27/34; H04L27/36; H04L27/362; H04L27/364; H04N; H04N21/00; H04N21/40; H04N21/41; H04N21/426; H04N7/00; H04N7/12; H04N11/00; H04N11/24; H04N11/30; H04L1/00; H04L2001/0098; H04L5/00; H04L5/003; H04L5/0058; H04L5/0064
Claims Analysis
Total Claims: 60
Claim 1
Independent Claim
125 words
A system for processing a high definition television signal providing greater image definition than a standard definition television signal, comprising: means for modulating a first carrier with first television signal information to produce a modulated first carrier; means for modulating a second carrier with second television signal information to produce a modulated second carrier, said second information exhibiting a smaller amplitude than said first information; and means for combining said modulated first and second carriers to produce a composite modulated signal containing high definition television information, said composite signal exhibiting a bandwidth compatible with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal.
Claim 2
Independent Claim
125 words
A system for processing a high definition television signal providing greater image definition than a standard definition television signal, comprising: means for modulating a first carrier with first television signal information to produce a modulated first carrier; means for modulating a second carrier with second television signal information to produce a modulated second carrier, said second information exhibiting a smaller amplitude than said first information; and means for combining said modulated first and second carriers to produce a composite modulated signal containing high definition television information, said composite signal exhibiting a bandwidth compatible with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal.
Claim 3
Independent Claim
146 words
A system for processing a high definition television signal providing greater image definition than a standard definition television signal, comprising: means for modulating a first carrier with first television signal information to produce a modulated first carrier; means for modulating a second carrier with second television signal information to produce a modulated second carrier; and means for combining said modulated first and second carriers to produce a composite modulated signal containing high definition television information, said composite signal exhibiting a bandwidth compatible with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal; wherein said first carrier is quadrature amplitude modulated by quadrature phased versions of said first information; and said second carrier is quadrature amplitude modulated by quadrature phased versions of said second information.
Claim 4
Independent Claim
146 words
A system for processing a high definition television signal providing greater image definition than a standard definition television signal, comprising: means for modulating a first carrier with first television signal information to produce a modulated first carrier; means for modulating a second carrier with second television signal information to produce a modulated second carrier; and means for combining said modulated first and second carriers to produce a composite modulated signal containing high definition television information, said composite signal exhibiting a bandwidth compatible with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal; wherein said first carrier is quadrature amplitude modulated by quadrature phased versions of said first information; and said second carrier is quadrature amplitude modulated by quadrature phased versions of said second information.
Claim 5
Dependent Claim
19 words
A system according to claim 1, wherein said first information exhibits a narrow bandwidth relative to said second information.
Claim 6
Dependent Claim
50 words
A system according to claim 1, wherein said modulated first carrier is disposed in a lower portion of the frequency spectrum of said composite modulated signal, separated from said modulated second carrier by a band of amplitude attenuated frequencies associated with high energy information in said standard definition television signal.
Claim 7
Dependent Claim
26 words
A system according to claim 1, wherein said attenuated frequencies are associated with high energy information modulating a picture carrier of said standard definition television signal.
Claim 8
Dependent Claim
31 words
A system according to claim 5, wherein said composite modulated signal additionally exhibits attenuation at frequencies associated with high energy information modulating a sound carrier of said standard definition television signal.
Claim 9
Dependent Claim
19 words
A system according to claim 1, wherein said first information is high priority information relative to said second information.
Claim 10
Dependent Claim
28 words
A system according to claim 7, wherein said first information comprises video information including primarily low frequency video information, and said second information includes high frequency video information.
Claim 11
Dependent Claim
16 words
A system according to claim 8, wherein said first information additionally includes audio and synchronizing information.
Claim 12
Independent Claim
123 words
A system for processing a high definition television signal providing greater image definition than a standard definition television signal, comprising: means for modulating a first carrier with first television signal information to produce a modulated first carrier; means for modulating a second carrier with second television signal information to produce a modulated second carrier; and means for combining said modulated first and second carriers to produce a composite modulated signal containing high definition television information, said composite signal exhibiting a bandwidth compatible with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal; wherein said first and second carriers are suppressed carriers.
Claim 13
Independent Claim
123 words
A system for processing a high definition television signal providing greater image definition than a standard definition television signal, comprising: means for modulating a first carrier with first television signal information to produce a modulated first carrier; means for modulating a second carrier with second television signal information to produce a modulated second carrier; and means for combining said modulated first and second carriers to produce a composite modulated signal containing high definition television information, said composite signal exhibiting a bandwidth compatible with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal; wherein said first and second carriers are suppressed carriers.
Claim 14
Independent Claim
126 words
A system for processing a high definition television signal providing greater image definition than a standard definition television signal, comprising: means for modulating a first carrier with first television signal information to produce a modulated first carrier; means for modulating a second carrier with second television signal information to produce a modulated second carrier; and means for combining said modulated first and second carriers to produce a composite modulated signal containing high definition television information, said composite signal exhibiting a bandwidth compatible with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal; wherein said first information and said second information are compressed digital information.
Claim 15
Independent Claim
126 words
A system for processing a high definition television signal providing greater image definition than a standard definition television signal, comprising: means for modulating a first carrier with first television signal information to produce a modulated first carrier; means for modulating a second carrier with second television signal information to produce a modulated second carrier; and means for combining said modulated first and second carriers to produce a composite modulated signal containing high definition television information, said composite signal exhibiting a bandwidth compatible with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal; wherein said first information and said second information are compressed digital information.
Claim 16
Independent Claim
216 words
A system for processing a high definition television signal providing greater image definition than a standard definition television signal, comprising: means for modulating a first carrier with first television signal information to produce a modulated first carrier; means for modulating a second carrier with second television signal information to produce a modulated second carrier; and means for combining said modulated first and second carriers to produce a composite modulated signal containing high definition television information, said composite signal exhibiting a bandwidth compatible with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal; wherein said first information is higher priority information relative to said second information and exhibits a narrow bandwidth relative to said second information; said first information exhibits a large amplitude relative to said second information; said first information quadrature amplitude modulates said first carrier; said second information quadrature amplitude modulates said second carrier; said composite signal modulation frequency spectrum exhibits signal attenuation at frequencies associated with information modulating at least one of a picture carrier or sound carrier of said standard definition television signal; and said modulated first carrier is disposed in a lower portion of said composite signal modulation frequency spectrum.
Claim 17
Independent Claim
216 words
A system for processing a high definition television signal providing greater image definition than a standard definition television signal, comprising: means for modulating a first carrier with first television signal information to produce a modulated first carrier; means for modulating a second carrier with second television signal information to produce a modulated second carrier; and means for combining said modulated first and second carriers to produce a composite modulated signal containing high definition television information, said composite signal exhibiting a bandwidth compatible with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal; wherein said first information is higher priority information relative to said second information and exhibits a narrow bandwidth relative to said second information; said first information exhibits a large amplitude relative to said second information; said first information quadrature amplitude modulates said first carrier; said second information quadrature amplitude modulates said second carrier; said composite signal modulation frequency spectrum exhibits signal attenuation at frequencies associated with information modulating at least one of a picture carrier or sound carrier of said standard definition television signal; and said modulated first carrier is disposed in a lower portion of said composite signal modulation frequency spectrum.
Claim 18
Independent Claim
135 words
A system for processing a high definition television signal providing greater image definition than a standard definition television signal, comprising: means for modulating a first carrier with first television signal information to produce a modulated first carrier; means for modulating a second carrier with second television signal information to produce a modulated second carrier; and means for combining said modulated first and second carriers to produce a composite modulated signal containing high definition television information, said composite signal exhibiting a bandwidth compatible with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal; wherein said second carrier exhibits a data rate which is an integral multiple of the data rate of said first carrier.
Claim 19
Independent Claim
135 words
A system for processing a high definition television signal providing greater image definition than a standard definition television signal, comprising: means for modulating a first carrier with first television signal information to produce a modulated first carrier; means for modulating a second carrier with second television signal information to produce a modulated second carrier; and means for combining said modulated first and second carriers to produce a composite modulated signal containing high definition television information, said composite signal exhibiting a bandwidth compatible with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal; wherein said second carrier exhibits a data rate which is an integral multiple of the data rate of said first carrier.
Claim 20
Dependent Claim
12 words
A system according to claim 13 wherein said integral multiple is 4.
Claim 21
Dependent Claim
170 words
In a system for receiving a high definition television signal comprising a composite modulated signal including a first carrier modulated with first information and a second carrier modulated with second information, said first information exhibiting a large amplitude relative to said second information, said first and second modulated carriers being separated by a band exhibiting signal attenuation at frequencies associated with high energy information in a standard definition television signal, said composite modulated signal having a bandwidth compatible with the bandwidth of a standard definition television signal channel, apparatus exhibiting signal attenuation at said frequencies associated with high energy information in a standard definition television signal and comprising: means responsive to said composite modulated signal for separating said modulated first carrier and said modulated second carrier; first signal processing means including means for demodulating said modulated first and second carriers to recover said first and second information; and second signal processing means responsive to recovered first and second information from said demodulating means for developing an image representative output signal.
Claim 22
Dependent Claim
170 words
In a system for receiving a high definition television signal comprising a composite modulated signal including a first carrier modulated with first information and a second carrier modulated with second information, said first information exhibiting a large amplitude relative to said second information, said first and second modulated carriers being separated by a band exhibiting signal attenuation at frequencies associated with high energy information in a standard definition television signal, said composite modulated signal having a bandwidth compatible with the bandwidth of a standard definition television signal channel, apparatus exhibiting signal attenuation at said frequencies associated with high energy information in a standard definition television signal and comprising: means responsive to said composite modulated signal for separating said modulated first carrier and said modulated second carrier; first signal processing means including means for demodulating said modulated first and second carriers to recover said first and second information; and second signal processing means responsive to recovered first and second information from said demodulating means for developing an image representative output signal.
Claim 23
Dependent Claim
24 words
Apparatus according to claim 15, wherein said demodulating means quadrature amplitude demodulates said modulated first carrier, and quadrature amplitude demodulates said modulated second carrier.
Claim 24
Dependent Claim
20 words
Apparatus according to claim 15 wherein said recovered first information exhibits a narrow bandwidth relative to said recovered second information.
Claim 25
Dependent Claim
41 words
Apparatus according to claim 15, wherein said recovered first information occupies a lower portion of the frequency spectrum of said composite modulated signal; and said recovered second information occupies an upper portion of said frequency spectrum of said composite modulated signal.
Claim 26
Dependent Claim
16 words
Apparatus according to claim 15 and further comprising means for decompressing said first and second information.
Claim 27
Dependent Claim
29 words
Apparatus according to claim 15, wherein said recovered first information comprises video information including primarily low frequency video information; and said recovered second information includes high frequency video information.
Claim 28
Dependent Claim
25 words
Apparatus according to claim 20, wherein said recovered first information additionally includes audio information; and said second signal processing means includes audio signal processing circuits.
Claim 29
Dependent Claim
27 words
Apparatus according to claim 15 and further including clock signal generating means responsive to a signal derived from said first information for producing a first clock signal.
Claim 30
Dependent Claim
40 words
Apparatus according to claim 22 wherein said clock signal generating means includes means for deriving a second clock signal from said first clock signal, said first and second clock signals having frequencies which are an integral multiple of each other.
Claim 31
Dependent Claim
215 words
In a system for receiving a high television signal comprising a composite modulated signal including a first carrier modulated with first information and a second carrier modulated with second information, said first and second modulated carriers being separated by a band exhibiting signal attenuation at frequencies associated with high energy information in a standard definition television signal, said composite modulated signal having a bandwidth compatible with the bandwidth of a standard definition television signal channel, apparatus exhibiting signal attenuation at said frequencies associated with high energy information in a standard definition television signal and comprising: means responsive to said composite modulated signal for separating said modulated first carrier and said modulated second carrier; first signal processing means including means for demodulating said modulated first and second carriers to recover said first and second information; second signal processing means responsive to recovered first and second information from said demodulating means for developing an image representative output signal; and clock signal generating means responsive to a signal derived from said first information for producing a first clock signal, said clock signal generating means including means for deriving a second clock signal from said first clock signal, said first and second clock signals having frequencies which are an integral multiple of each other; wherein said multiple is 4.
Claim 32
Dependent Claim
215 words
In a system for receiving a high television signal comprising a composite modulated signal including a first carrier modulated with first information and a second carrier modulated with second information, said first and second modulated carriers being separated by a band exhibiting signal attenuation at frequencies associated with high energy information in a standard definition television signal, said composite modulated signal having a bandwidth compatible with the bandwidth of a standard definition television signal channel, apparatus exhibiting signal attenuation at said frequencies associated with high energy information in a standard definition television signal and comprising: means responsive to said composite modulated signal for separating said modulated first carrier and said modulated second carrier; first signal processing means including means for demodulating said modulated first and second carriers to recover said first and second information; second signal processing means responsive to recovered first and second information from said demodulating means for developing an image representative output signal; and clock signal generating means responsive to a signal derived from said first information for producing a first clock signal, said clock signal generating means including means for deriving a second clock signal from said first clock signal, said first and second clock signals having frequencies which are an integral multiple of each other; wherein said multiple is 4.
Claim 33
Dependent Claim
246 words
In a system for receiving a high television signal comprising a composite modulated signal including a first carrier modulated with first information and a second carrier modulated with second information, said first and second modulated carriers being separated by a band exhibiting signal attenuation at frequencies associated with high energy information in a standard definition television signal, said composite modulated signal having a bandwidth compatible with the bandwidth of a standard definition television signal channel, apparatus exhibiting signal attenuation at said frequencies associated with high energy information in a standard definition television signal and comprising: means responsive to said composite modulated signal for separating said modulated first carrier and said modulated second carrier; first signal processing means including means for demodulating said modulated first and second carriers to recover said first and second information; second signal processing means responsive to recovered first and second information from said demodulating means for developing an image representative output signal; and clock signal generating means responsive to a signal derived from said first information for producing a first clock signal, said clock signal generating means including means for deriving a second clock signal from said first clock signal, said first and second clock signals having frequencies which are an integral multiple of each other; wherein said first clock signal is applied to said first signal processing means for processing said second information, and said second clock signal is applied to said first signal processing means for processing said first information.
Claim 34
Dependent Claim
246 words
In a system for receiving a high television signal comprising a composite modulated signal including a first carrier modulated with first information and a second carrier modulated with second information, said first and second modulated carriers being separated by a band exhibiting signal attenuation at frequencies associated with high energy information in a standard definition television signal, said composite modulated signal having a bandwidth compatible with the bandwidth of a standard definition television signal channel, apparatus exhibiting signal attenuation at said frequencies associated with high energy information in a standard definition television signal and comprising: means responsive to said composite modulated signal for separating said modulated first carrier and said modulated second carrier; first signal processing means including means for demodulating said modulated first and second carriers to recover said first and second information; second signal processing means responsive to recovered first and second information from said demodulating means for developing an image representative output signal; and clock signal generating means responsive to a signal derived from said first information for producing a first clock signal, said clock signal generating means including means for deriving a second clock signal from said first clock signal, said first and second clock signals having frequencies which are an integral multiple of each other; wherein said first clock signal is applied to said first signal processing means for processing said second information, and said second clock signal is applied to said first signal processing means for processing said first information.
Claim 35
Independent Claim
105 words
A system for processing a high definition television signal providing greater image definition than a standard definition television signal, comprising: means for modulating a first carrier with first television signal information, comprising predominantly low-frequency information, to produce a modulated first carrier; means for modulating a second carrier with second television signal information to produce a modulated second carrier, said second information exhibiting a smaller amplitude than said first information; and means for combining said modulated first and second carriers to produce a modulation frequency spectrum having a lower band portion containing said modulated first carrier and an upper band portion containing said modulated second carrier.
Claim 36
Independent Claim
105 words
A system for processing a high definition television signal providing greater image definition than a standard definition television signal, comprising: means for modulating a first carrier with first television signal information, comprising predominantly low-frequency information, to produce a modulated first carrier; means for modulating a second carrier with second television signal information to produce a modulated second carrier, said second information exhibiting a smaller amplitude than said first information; and means for combining said modulated first and second carriers to produce a modulation frequency spectrum having a lower band portion containing said modulated first carrier and an upper band portion containing said modulated second carrier.
Claim 37
Dependent Claim
150 words
In a system for receiving a high definition television signal comprising a composite modulated signal including a first carrier modulated with first television signal information comprising predominantly low frequency information occupying a lower band portion of the frequency spectrum of said composite modulated signal, and a second carrier modulated with second television signal information occupying an upper band portion of said frequency spectrum of said composite signal, said second information exhibiting a smaller amplitude than said first information, apparatus comprising input means responsive to said television signal for producing said composite modulated signal at baseband frequencies; first signal processing means responsive to said baseband composite modulated signal and including means for demodulating said modulated first and second carriers to recover said first information and said second information; and second signal processing means responsive to recovered first and second information from said demodulating means for developing an image representative output signal.
Claim 38
Dependent Claim
150 words
In a system for receiving a high definition television signal comprising a composite modulated signal including a first carrier modulated with first television signal information comprising predominantly low frequency information occupying a lower band portion of the frequency spectrum of said composite modulated signal, and a second carrier modulated with second television signal information occupying an upper band portion of said frequency spectrum of said composite signal, said second information exhibiting a smaller amplitude than said first information, apparatus comprising input means responsive to said television signal for producing said composite modulated signal at baseband frequencies; first signal processing means responsive to said baseband composite modulated signal and including means for demodulating said modulated first and second carriers to recover said first information and said second information; and second signal processing means responsive to recovered first and second information from said demodulating means for developing an image representative output signal.
Claim 39
Dependent Claim
33 words
Apparatus according to claim 27, wherein said recovered first information exhibits a narrow bandwidth relative to said recovered second information and contains low frequency video information substantially exclusive of high frequency video information.
Claim 40
Independent Claim
135 words
A system for processing a high definition television signal providing greater image definition than a standard television signal, comprising: means for modulating a first carrier with first television signal information to produce a modulated first carrier; means for modulating a second carrier with second television signal information to produce a modulated second carrier, said second information exhibiting a smaller amplitude than said first information; and means for combining said modulated first and second carriers to produce a modulation frequency spectrum having a lower band portion containing said modulated first carrier and an upper band portion containing said modulated second carrier, wherein said modulated first carrier is disposed in said lower band portion so that said modulated first carrier is subject to being significantly attenuated by a Nyquist slope filter of a standard definition television receiver.
Claim 41
Independent Claim
135 words
A system for processing a high definition television signal providing greater image definition than a standard television signal, comprising: means for modulating a first carrier with first television signal information to produce a modulated first carrier; means for modulating a second carrier with second television signal information to produce a modulated second carrier, said second information exhibiting a smaller amplitude than said first information; and means for combining said modulated first and second carriers to produce a modulation frequency spectrum having a lower band portion containing said modulated first carrier and an upper band portion containing said modulated second carrier, wherein said modulated first carrier is disposed in said lower band portion so that said modulated first carrier is subject to being significantly attenuated by a Nyquist slope filter of a standard definition television receiver.
Claim 42
Dependent Claim
169 words
In a system for receiving a high definition television signal comprising a composite modulated signal including a first carrier modulated with first information and a second carrier modulated with second information, said second information exhibiting a smaller amplitude than said first information, said modulated second carrier occupying an upper band portion frequency spectrum of said composite modulated signal and said modulated first carrier being disposed in a lower band portion of said frequency spectrum so that said modulated first carrier is subject to being significantly attenuated by a Nyquist slope filter of a standard definition television receiver, apparatus comprising: input means responsive to said television signal for producing said composite modulated signal at baseband frequencies; first signal processing means responsive to said baseband composite modulated signal and including means for demodulating said modulated first and second carriers to recover said first information and said second information; and second signal processing means responsive to recovered first and second information from said demodulating means for developing an image representative output signal.
Claim 43
Dependent Claim
169 words
In a system for receiving a high definition television signal comprising a composite modulated signal including a first carrier modulated with first information and a second carrier modulated with second information, said second information exhibiting a smaller amplitude than said first information, said modulated second carrier occupying an upper band portion frequency spectrum of said composite modulated signal and said modulated first carrier being disposed in a lower band portion of said frequency spectrum so that said modulated first carrier is subject to being significantly attenuated by a Nyquist slope filter of a standard definition television receiver, apparatus comprising: input means responsive to said television signal for producing said composite modulated signal at baseband frequencies; first signal processing means responsive to said baseband composite modulated signal and including means for demodulating said modulated first and second carriers to recover said first information and said second information; and second signal processing means responsive to recovered first and second information from said demodulating means for developing an image representative output signal.
Claim 44
Independent Claim
152 words
A system for encoding an HDTV signal, comprising: a source of compressed first digital data and compressed second digital data representative of HDTV image data, said first data having a higher priority than said second data; means responsive to said first and second digital data for providing first and second suppressed carrier QAM signals containing said first and second digital data respectively, said first QAM signal having a peak amplitude greater than that of said second QAM signal and having a bandwidth less than that of said second QAM signal; and means, including means for combining said first and second QAM signals, for providing a signal occupying a standard television signal channel, wherein said first and second QAM signals occupy substantially mutually exclusive spectral bands in said channel, said spectral bands being located in frequency bands normally occupied by the vestigial sideband and the upper sideband of a standard television signal respectively.
Claim 45
Independent Claim
152 words
A system for encoding an HDTV signal, comprising: a source of compressed first digital data and compressed second digital data representative of HDTV image data, said first data having a higher priority than said second data; means responsive to said first and second digital data for providing first and second suppressed carrier QAM signals containing said first and second digital data respectively, said first QAM signal having a peak amplitude greater than that of said second QAM signal and having a bandwidth less than that of said second QAM signal; and means, including means for combining said first and second QAM signals, for providing a signal occupying a standard television signal channel, wherein said first and second QAM signals occupy substantially mutually exclusive spectral bands in said channel, said spectral bands being located in frequency bands normally occupied by the vestigial sideband and the upper sideband of a standard television signal respectively.
Claim 46
Dependent Claim
161 words
A receiver system for processing an HDTV signal comprising first and second suppressed carrier QAM signals occupying mutually exclusive spectral bands in a standard television signal channel, said first QAM signal (a) being located in a frequency band normally occupied by the vestigial sideband of a standard television signal, (b) containing compressed digital data with a high priority relative to compressed digital data contained by said second QAM signal, (c) having a peak amplitude greater than that of said second QAM signal, and (d) having a bandwidth less than that of said second QAM signal, said second QAM signal being located in a frequency band of said standard television channel normally occupied by the upper sideband of said standard television signal; said system comprising: means for demodulating said first and second QAM signals to recover associated compressed digital data; means for decompressing said recovered digital data; and means responsive to said decompressed recovered digital data for developing an image representative signal.
Claim 47
Dependent Claim
161 words
A receiver system for processing an HDTV signal comprising first and second suppressed carrier QAM signals occupying mutually exclusive spectral bands in a standard television signal channel, said first QAM signal (a) being located in a frequency band normally occupied by the vestigial sideband of a standard television signal, (b) containing compressed digital data with a high priority relative to compressed digital data contained by said second QAM signal, (c) having a peak amplitude greater than that of said second QAM signal, and (d) having a bandwidth less than that of said second QAM signal, said second QAM signal being located in a frequency band of said standard television channel normally occupied by the upper sideband of said standard television signal; said system comprising: means for demodulating said first and second QAM signals to recover associated compressed digital data; means for decompressing said recovered digital data; and means responsive to said decompressed recovered digital data for developing an image representative signal.
Claim 48
Independent Claim
138 words
A system for encoding a high definition television (HDTV) signal, comprising: a source of compressed first digital data and compressed second digital data representative of HDTV image data; means for providing first and second signals modulated by said first and second digital data respectively; and means for combining said first and second modulated signals for providing a signal occupying a standard television signal channel, said first and second modulated signals occupying substantially mutually exclusive spectral bands in said channel respectively; wherein said first and second modulated signals occupy lower and upper spectral bands in said channel respectively; said first modulated signal exhibits an amplitude greater than that of said second modulated signal; and said first modulated signal contains video information sufficient to reproduce a viewable lower definition image independent of video information associated with said second modulated signal.
Claim 49
Independent Claim
138 words
A system for encoding a high definition television (HDTV) signal, comprising: a source of compressed first digital data and compressed second digital data representative of HDTV image data; means for providing first and second signals modulated by said first and second digital data respectively; and means for combining said first and second modulated signals for providing a signal occupying a standard television signal channel, said first and second modulated signals occupying substantially mutually exclusive spectral bands in said channel respectively; wherein said first and second modulated signals occupy lower and upper spectral bands in said channel respectively; said first modulated signal exhibits an amplitude greater than that of said second modulated signal; and said first modulated signal contains video information sufficient to reproduce a viewable lower definition image independent of video information associated with said second modulated signal.
Claim 50
Independent Claim
147 words
A system for receiving a high definition television signal containing a first signal modulated with audio and video information and a second signal modulated with video information occupying substantially mutually exclusive lower and upper spectral bands within a standard television channel respectively, said first modulated signal containing video and audio information sufficient to produce a viewable lower definition image independent of information associated with said second modulated signal; said system comprising means for demodulating said first and second modulated signals to recover associated audio and video information; means for combining recovered video information associated with said first modulated signal with recovered video information associated with said second modulated signal for producing a combined video signal; video signal processing means responsive to said combined video signal for producing an image representative signal;. and audio signal processing means responsive to recovered audio information associated with said first modulated signal.
Claim 51
Independent Claim
147 words
A system for receiving a high definition television signal containing a first signal modulated with audio and video information and a second signal modulated with video information occupying substantially mutually exclusive lower and upper spectral bands within a standard television channel respectively, said first modulated signal containing video and audio information sufficient to produce a viewable lower definition image independent of information associated with said second modulated signal; said system comprising means for demodulating said first and second modulated signals to recover associated audio and video information; means for combining recovered video information associated with said first modulated signal with recovered video information associated with said second modulated signal for producing a combined video signal; video signal processing means responsive to said combined video signal for producing an image representative signal;. and audio signal processing means responsive to recovered audio information associated with said first modulated signal.
Claim 52
Dependent Claim
23 words
A system according to claim 34, and further including clock signal generating means responsive to a signal derived from said first modulated signal.
Claim 53
Dependent Claim
161 words
In a system for receiving a high definition television signal providing greater image definition than a standard definition television signal and comprising a composite modulated signal including a first carrier quadrature amplitude modulated with quadrature phased versions of said first television information and a second carrier quadrature amplitude modulated with quadrature phased versions of said second television information, said composite signal exhibiting a bandwidth comparable with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal, apparatus comprising: means responsive to said composite modulated signal for separating said modulated first carrier and said modulated second carrier; first signal processing means including means for demodulating said modulated first and second carriers to recover said first and second information; and second signal processing means responsive to recovered first and second information from said demodulating means for developing an image representative output signal.
Claim 54
Dependent Claim
161 words
In a system for receiving a high definition television signal providing greater image definition than a standard definition television signal and comprising a composite modulated signal including a first carrier quadrature amplitude modulated with quadrature phased versions of said first television information and a second carrier quadrature amplitude modulated with quadrature phased versions of said second television information, said composite signal exhibiting a bandwidth comparable with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal, apparatus comprising: means responsive to said composite modulated signal for separating said modulated first carrier and said modulated second carrier; first signal processing means including means for demodulating said modulated first and second carriers to recover said first and second information; and second signal processing means responsive to recovered first and second information from said demodulating means for developing an image representative output signal.
Claim 55
Dependent Claim
149 words
In a system for receiving a high definition television signal providing greater image definition than a standard definition television signal and comprising a composite modulated signal including a suppressed first carrier modulated with first television information and a suppressed second carrier modulated with second television information, said composite signal exhibiting a bandwidth compatible with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal, apparatus comprising: means responsive to said composite modulated signal for separating said modulated first carrier and said modulated second carrier; first signal processing means including means for demodulating said modulated first and second carriers to recover said first and second information; and second signal processing means responsive to recovered first and second information from said demodulating means for developing an image representative output signal.
Claim 56
Dependent Claim
149 words
In a system for receiving a high definition television signal providing greater image definition than a standard definition television signal and comprising a composite modulated signal including a suppressed first carrier modulated with first television information and a suppressed second carrier modulated with second television information, said composite signal exhibiting a bandwidth compatible with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal, apparatus comprising: means responsive to said composite modulated signal for separating said modulated first carrier and said modulated second carrier; first signal processing means including means for demodulating said modulated first and second carriers to recover said first and second information; and second signal processing means responsive to recovered first and second information from said demodulating means for developing an image representative output signal.
Claim 57
Dependent Claim
155 words
In a system for receiving a high definition television signal providing greater image definition than a standard definition television signal and comprising a composite modulated signal including a first carrier modulated with first television information representing compressed digital information and a second carrier modulated with second television information representing compressed digital information, said composite signal exhibiting a bandwidth compatible with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal, apparatus comprising: means responsive to said composite modulated signal for separating said modulated first carrier and said modulated second carrier; first signal processing means including means for demodulating said modulated first and second carriers to recover said first and second information; and second signal processing means responsive to recovered first and second information from said demodulating means for developing an image representative output signal.
Claim 58
Dependent Claim
155 words
In a system for receiving a high definition television signal providing greater image definition than a standard definition television signal and comprising a composite modulated signal including a first carrier modulated with first television information representing compressed digital information and a second carrier modulated with second television information representing compressed digital information, said composite signal exhibiting a bandwidth compatible with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal, apparatus comprising: means responsive to said composite modulated signal for separating said modulated first carrier and said modulated second carrier; first signal processing means including means for demodulating said modulated first and second carriers to recover said first and second information; and second signal processing means responsive to recovered first and second information from said demodulating means for developing an image representative output signal.
Claim 59
Dependent Claim
165 words
In a system for receiving a high definition television signal providing greater image definition than a standard definition television signal and comprising a composite modulated signal including a first carrier modulated with first television information and a second carrier modulated with second television information, said second carrier exhibiting a frequency which is an integral multiple of the frequency of said first carrier, said composite signal exhibiting a bandwidth compatible with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal, apparatus comprising: means responsive to said composite modulated signal for separating said modulated first carrier and said modulated second carrier; first signal processing means including means for demodulating said modulated first and second carriers to recover said first and second information; and second signal processing means responsive to recovered first and second information from said demodulating means for developing an image representative output signal.
Claim 60
Dependent Claim
165 words
In a system for receiving a high definition television signal providing greater image definition than a standard definition television signal and comprising a composite modulated signal including a first carrier modulated with first television information and a second carrier modulated with second television information, said second carrier exhibiting a frequency which is an integral multiple of the frequency of said first carrier, said composite signal exhibiting a bandwidth compatible with the bandwidth of a standard definition television signal channel, and having a modulation frequency spectrum exhibiting signal attenuation at frequencies associated with high energy information in said standard definition television signal, apparatus comprising: means responsive to said composite modulated signal for separating said modulated first carrier and said modulated second carrier; first signal processing means including means for demodulating said modulated first and second carriers to recover said first and second information; and second signal processing means responsive to recovered first and second information from said demodulating means for developing an image representative output signal.
References Cited (Backward Citations)
EP0279625A2
Cited
EP0361564A2
Cited
EP0364285A2
Cited
WO1991015925A1
Cited
US5063445A
Cited
US5134464A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-02-14 | 1997-08-16 | 1998-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-14 | 2001-08-16 | 2002-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-14 | 2005-08-16 | 2006-02-15 | $7700.00 | Window Closed / Lapsed |