US3748376A
Expired / Lapsed
US
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Recording system for color video signals
Assignee: Motorola Solutions Inc
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Filing: 1971-10-15
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Granted: 1973-07-24
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Expires: 1991-10-15
Abstract
Abstract Color signal recording of two channel color information, wherein one channel provides substantially more information than the other channel. The information is converted to a train of pulse width modulated pulses to contain the information, and with the train including more pulses for the one channel than for the other; such as two pulses for the one channel for each pulse of the other channel. Regularly recurring pulses for the two channels are shifted in phase to produce a combined pulse train in which the pulses are at regularly spaced positions. Pulses representing information in the one channel may be duplicated, or may be sampled at twice the rate, to provide two pulses for the one channel for each pulse of the other channel. The pulse train is recorded and reproduced, and then decoded to separate the pulses for the two channels and to position the pulses in each channel to provide regularly occurring pulse trains for each channel.
Inventors
- 👤 N Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:15
CPC Classifications
H; H04; H04B; H04B14/00; H04B14/02; H04B14/026; H04N; H04N5/00; H04N5/76; H04N5/84; H04N5/843; H04N9/00; H04N9/79; H04N9/80; H04N9/86
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
175 words
In a color television reproducing system for displaying a color picture in response to a record medium having first and second image areas thereon, with the first area representing the brightness of the picture and the second area representing color information, and wherein the second area has a plurality of lines having widths which represent two channel color information associated with the image on a corresponding part of the first area, the method which includes the steps of, applying information to the record medium to form a first number of said lines having the widths thereof modulated by information from one channel interspersed with a greater number of said lines having the widths thereof modulated by information from the second channel, scanning said lines to produce pulse signals varying with the widths thereof, separating the pulse signals providing information for said one channel and said second channel, and shifting the position of at least a part of the pulse signals providing information for said second channel to provide a pulse train with uniform pulse spacing.
Claim 2
Dependent Claim
175 words
In a color television reproducing system for displaying a color picture in response to a record medium having first and second image areas thereon, with the first area representing the brightness of the picture and the second area representing color information, and wherein the second area has a plurality of lines having widths which represent two channel color information associated with the image on a corresponding part of the first area, the method which includes the steps of, applying information to the record medium to form a first number of said lines having the widths thereof modulated by information from one channel interspersed with a greater number of said lines having the widths thereof modulated by information from the second channel, scanning said lines to produce pulse signals varying with the widths thereof, separating the pulse signals providing information for said one channel and said second channel, and shifting the position of at least a part of the pulse signals providing information for said second channel to provide a pulse train with uniform pulse spacing.
Claim 3
Dependent Claim
49 words
The method of claim 1 wherein the widths of said first number Of lines are modulated by information from the Q color channel, and wherein said greater number of lines is two times said first number and the widths thereof are modulated by information from the I color channel.
Claim 4
Independent Claim
240 words
A system for operation with two channel color signal information, with more information being provided from one channel than the other, including in combination, first and second pulse width modulators for receiving a sampling wave and producing a train of pulses modulated in width in response to a signal applied thereto, means for applying to said first modulator a first color information signal of a first band-width from the first information channel, means for applying to said second modulator a second color information signal having a smaller bandwidth than said first bandwidth from the second information channel, oscillator means coupled to said first pulse width modulator for applying thereto a sampling wave of a given frequency, phase shift means coupling said oscillator means to said second modulator for applying a sampling wave shifted in phase with respect to the wave applied to said first modulator, summing means for combining a plurality of pulse width modulated pulse trains, means coupling said first pulse width modulator to said summing means for applying a modulated pulse train thereto, means including delay means coupling said first pulse width modulator to said summing means for applying a second modulated pulse train thereto, and means coupling said second pulse width modulator to said summing means for applying a third modulated pulse train thereto, whereby said summing means produces a combined pulse train including two pulses from said first modulator for each pulse from said second modulator.
Claim 5
Independent Claim
240 words
A system for operation with two channel color signal information, with more information being provided from one channel than the other, including in combination, first and second pulse width modulators for receiving a sampling wave and producing a train of pulses modulated in width in response to a signal applied thereto, means for applying to said first modulator a first color information signal of a first band-width from the first information channel, means for applying to said second modulator a second color information signal having a smaller bandwidth than said first bandwidth from the second information channel, oscillator means coupled to said first pulse width modulator for applying thereto a sampling wave of a given frequency, phase shift means coupling said oscillator means to said second modulator for applying a sampling wave shifted in phase with respect to the wave applied to said first modulator, summing means for combining a plurality of pulse width modulated pulse trains, means coupling said first pulse width modulator to said summing means for applying a modulated pulse train thereto, means including delay means coupling said first pulse width modulator to said summing means for applying a second modulated pulse train thereto, and means coupling said second pulse width modulator to said summing means for applying a third modulated pulse train thereto, whereby said summing means produces a combined pulse train including two pulses from said first modulator for each pulse from said second modulator.
Claim 6
Dependent Claim
133 words
A system in accordance with claim 3 further including, recording means for recording said combined pulse train on a record medium, reproducing means for scanning the record medium to reproduce said combined pulse train, further oscillator means operative at the given frequency and synchronized by the reproduced pulse train, gate means coupled to said further oscillator means for separating from the reproduced pulse train the pulses from said first modulator and the pulse from said second modulator, said gate means further separating the two pulses from said first modulator from each other, means for delaying one of the pulses from said first modulator to provide spacing between said pulses from said first modulator of 180* at said given frequency, and means combining said delayed pulse and the other pulse from said first modulator.
Claim 7
Independent Claim
255 words
A system for producing a pulse train providing two channel color signal information, with more information being provided from one channel than the other, including in combination, first and second pulse width modulators for receiving a sampling wave and producing a train of pulses modulated in width in response to a signal applied thereto, means for applying to said first modulator a first color information signal of a first bandwidth from the first information channel, means for applying to said second modulator a second color information having a smaller bandwidth than said first bandwidth from the second information channel, oscillator means coupled to said first pulse width modulator for applying thereto a sampling wave of a given frequency, phase shift means coupling said oscillator means to said second modulator for applying a sampling wave thereto shifted 240* with respect to the wave applied to said first modulator, summing means for combining a plurality of pulse width modulated pulse trains, means coupled to said first pulse width modulator for applying the modulated pulse train therefrom to said summing means, means providing a delay of 120* coupled to said first pulse width modulator for applying said modulated pulse train therefrom to said summing means, and means coupled to said second pulse width modulator for applying the modulated pulse train therefrom to Said summing means, whereby said summing means produces a combined pulse train with pulses having leading edges spaced at 120* intervals, and including two pulses from said first modulator for each pulse from said second modulator.
Claim 8
Independent Claim
255 words
A system for producing a pulse train providing two channel color signal information, with more information being provided from one channel than the other, including in combination, first and second pulse width modulators for receiving a sampling wave and producing a train of pulses modulated in width in response to a signal applied thereto, means for applying to said first modulator a first color information signal of a first bandwidth from the first information channel, means for applying to said second modulator a second color information having a smaller bandwidth than said first bandwidth from the second information channel, oscillator means coupled to said first pulse width modulator for applying thereto a sampling wave of a given frequency, phase shift means coupling said oscillator means to said second modulator for applying a sampling wave thereto shifted 240* with respect to the wave applied to said first modulator, summing means for combining a plurality of pulse width modulated pulse trains, means coupled to said first pulse width modulator for applying the modulated pulse train therefrom to said summing means, means providing a delay of 120* coupled to said first pulse width modulator for applying said modulated pulse train therefrom to said summing means, and means coupled to said second pulse width modulator for applying the modulated pulse train therefrom to Said summing means, whereby said summing means produces a combined pulse train with pulses having leading edges spaced at 120* intervals, and including two pulses from said first modulator for each pulse from said second modulator.
Claim 9
Dependent Claim
58 words
A system in accordance with claim 5 wherein the first information channel is the I channel having a bandwidth of the order of 1 megahertz, the second information channel is the Q channel having a bandwidth of the order of 0.5 megahertz, and said oscillator means produces a wave having a frequency of the order of 1.2 megahertz.
Claim 10
Independent Claim
294 words
A system for producing a pulse train providing two channel color signal information, with more information being provided from one channel than the other, including in combination, first and second pulse width modulators for receiving a sampling wave and producing a train of pulses modulated in width in response to a signal applied thereto, means for applying to said first modulator a first color information signal from the first information channel having a first bandwidth, means for applying to said second modulator a second color information signal from the second information channel having a smaller bandwidth than said first bandwidth, oscillator means for producing a sampling wave of a given frequency, frequency doubling means coupling said oscillator means to said first modulator for applying thereto a sampling wave having frequency twice said given frequency, phase shift means coupling said oscillator means to said second modulator to apply a sampling wave thereto shifted 120* with respect to said wave applied to said first modulator, summing means for combining pulses from a plurality of pulse width modulated pulse trains, first gate means coupling said first pulse width modulator to said summing means for applying thereto alternate modulated pulses, time delay means providing a delay of 60*, second gate means coupling said first pulse width modulator to said time delay means for applying thereto modulated pulses alternate to the pulses applied by said first gate means, means coupling said time delay means to said summing means to apply the delayed alternate pulses thereto, and means coupling said second pulse width modulator to said summing means for applying the modulated pulse train thereto, whereby said summing means produces a combined pulse train including two spaced pulses from said first modulator interspersed between adjacent pulses from said second modulator.
Claim 11
Independent Claim
294 words
A system for producing a pulse train providing two channel color signal information, with more information being provided from one channel than the other, including in combination, first and second pulse width modulators for receiving a sampling wave and producing a train of pulses modulated in width in response to a signal applied thereto, means for applying to said first modulator a first color information signal from the first information channel having a first bandwidth, means for applying to said second modulator a second color information signal from the second information channel having a smaller bandwidth than said first bandwidth, oscillator means for producing a sampling wave of a given frequency, frequency doubling means coupling said oscillator means to said first modulator for applying thereto a sampling wave having frequency twice said given frequency, phase shift means coupling said oscillator means to said second modulator to apply a sampling wave thereto shifted 120* with respect to said wave applied to said first modulator, summing means for combining pulses from a plurality of pulse width modulated pulse trains, first gate means coupling said first pulse width modulator to said summing means for applying thereto alternate modulated pulses, time delay means providing a delay of 60*, second gate means coupling said first pulse width modulator to said time delay means for applying thereto modulated pulses alternate to the pulses applied by said first gate means, means coupling said time delay means to said summing means to apply the delayed alternate pulses thereto, and means coupling said second pulse width modulator to said summing means for applying the modulated pulse train thereto, whereby said summing means produces a combined pulse train including two spaced pulses from said first modulator interspersed between adjacent pulses from said second modulator.
Claim 12
Dependent Claim
58 words
A system in accordance with claim 7 wherein the first information channel is the I channel having a bandwidth of the order of 1 megahertz, the second information channel is the Q channel having a bandwidth of the order of 0.5 megahertz, and said oscillator means produces a wave having a frequency of the order of 1.2 megahertz.
Claim 13
Dependent Claim
32 words
The system of claim 7 including means coupling said oscillator means to said gate means for controlling the same to operate alternately to apply alternate pulses from said first modulator means therethrough.
Claim 14
Dependent Claim
123 words
A system in accordance with claim 9 further including, recording means for recording said combined pulse train on a record medium, reproducing means for scanning the record medium to reproduce said combined pulse train, further oscillator means operative at the given frequency synchronized by the reproduced pulse train, further gate means coupled to said further oscillator means and to said reproducing means for separating the two pulses from said first modulator from each other and from the pulse from said second modulator, means for delaying one of the pulses from said first modulator to provide spacing at 180* at said given frequency between said pulses from said first modulator, and means combining said delayed pulse and the other pulse from said first modulator.
Claim 15
Dependent Claim
187 words
A system in accordance with claim 10 wherein said further gate means includes first and second gates, and third and fourth gates coupled to said first gate, means for applying the reproduced pulse train to said first and second gates, first means coupled to said further oscillator means and to said first and second gates for operating said first gate to pass the two pulses from said first modulator to said third and fourth gates and for operating said second gate to pass the pulse from said second modulator, time delay means connected to said fourth gate, summing means connected to said third gate and to said time delay means, and second means coupled to said further oscillator means for operating said third and fourth gates so that said third gate passes one of said pulses from said first modulator to said summing means and said fourth gate passes the other one of said pulses from said first modulator through said time delay means to said summing means, said time delay means providing the delay required so that uniformly spaced pulses are applied to said summing means.
Claim 16
Dependent Claim
154 words
A decoder for separating pulses in a pulse train which includes recurring sets of first and second modulated pulses representing a first channel signal interspersed with recurring third pulses representing a second channel signal, with said pulses having leading edges which are uniformly spaced, such decoder including in combination, oscillator means operative at a frequency of one third the repetition rate of the pulses, gate means, means for applying the pulse train to said gate means, means coupled to said oscillator means and to said gate means for applying pulses to said gate means so that the first and second pulses representing the first channel are separated from each other and from the third pulse representing the second channel, means for delaying the second pulse to produce a spacing of 180between said first and second pulses at the frequency of said oscillator means, and means combining said first pulse and the delayed second pulse.
Claim 17
Dependent Claim
154 words
A decoder for separating pulses in a pulse train which includes recurring sets of first and second modulated pulses representing a first channel signal interspersed with recurring third pulses representing a second channel signal, with said pulses having leading edges which are uniformly spaced, such decoder including in combination, oscillator means operative at a frequency of one third the repetition rate of the pulses, gate means, means for applying the pulse train to said gate means, means coupled to said oscillator means and to said gate means for applying pulses to said gate means so that the first and second pulses representing the first channel are separated from each other and from the third pulse representing the second channel, means for delaying the second pulse to produce a spacing of 180between said first and second pulses at the frequency of said oscillator means, and means combining said first pulse and the delayed second pulse.
Claim 18
Dependent Claim
166 words
A decoder in accordance with claim 12 wherein said gate means includes first and second gates, and third and fourth gates coupled to said first gate, means for applying the pulse train to said first and second gates, first means coupled to said oscillator means and to said first and second gates for operating said first gate to pass the first and second pulses to said third and fourth gates and for operating said second gate to pass the third pulse, time delay means connected to said fourth gate, summing means connected to said third gate and to said time delay means, and second means coupled to said oscillator means for operating said third and fourth gates so that said third gate passes the first pulse to said summing means and said fourth gate passes the second pulse through said time delay means to said summing means, said time delay means providing the delay required so that uniformly spaced pulses are applied to said summing means.
References Cited (Backward Citations)
US3441674A
Cited
US3644677A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |