US3580990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording and reproducing system for color video signals
Assignee: Sony Corp
•
Filing: 1968-11-13
•
Granted: 1971-05-25
•
Expires: 1988-11-13
Abstract
Abstract In recording a composite color video signal consisting of a luminance signal and a modulated chrominance signal having its frequency band contained within the luminance signal band, a carrier is frequency modulated with the luminance signal separated from the composite signal, the modulated chrominance signal separated from the composite original is frequency converted to have a frequency band juxtaposed to the lower limit of the bandwidth of the frequency-modulated luminance signal, and the latter is combined with the thus converted chrominance signal and with a pilot signal having a still lower bandwidth to provide a combined signal which is magnetically recorded. Upon magnetic reproduction of the combined signal thus recorded, the pilot signal, frequency-modulated luminance signal and converted chrominance signal are separately extracted from the reproduced signal, amplitude variations of the pilot signal are detected to control the amplitude of the converted chrominance signal which is reconverted to substantially its original frequency band by reference to the pilot signal, and the frequency-modulated luminance signal is demodulated and combined with the reconverted modulated chrominance signal to provide the composite color video signal.
Inventors
- 👤 Toshihiko Numakura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:46
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/793; H04N9/80; H04N9/82; H04N9/83
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
219 words
A system for recording and reproducing a composite color video signal consisting of a luminance signal and a modulated chrominance signal having its frequency band within that of the luminance signal, coMprising means for extracting said luminance and chrominance signals from said composite signal, means for frequency modulating said luminance signal, means for frequency converting said chrominance signal to a frequency band juxtaposed to the lower limit of the frequency bandwidth of the frequencymodulated luminance signal, means for producing a pilot signal with a frequency band lower than that of the frequency-converted chrominance signal, means for combining said frequency-modulated luminance signal with said frequency-converted chrominance signal and said pilot signal to provide a single combined signal, means for magnetically recording said combined signal and for magnetically reproducing the same, means for extracting said frequency-modulated luminance signal, said frequency-converted chrominance signal and said pilot signal from the reproduced combined signal, means for demodulating the extracted frequencymodulated luminance signal, means responsive to variations in the amplitude of the extracted pilot signal to control the amplitude of the extracted frequency-converted chrominance signal, means receiving the extracted pilot signal to reconvert the amplitudecontrolled chrominance signal to substantially its original frequency band and means combining the demodulated luminance signal with the reconverted chrominance signal so as to reconstitute the composite color video signal therefrom.
Claim 2
Independent Claim
219 words
A system for recording and reproducing a composite color video signal consisting of a luminance signal and a modulated chrominance signal having its frequency band within that of the luminance signal, coMprising means for extracting said luminance and chrominance signals from said composite signal, means for frequency modulating said luminance signal, means for frequency converting said chrominance signal to a frequency band juxtaposed to the lower limit of the frequency bandwidth of the frequencymodulated luminance signal, means for producing a pilot signal with a frequency band lower than that of the frequency-converted chrominance signal, means for combining said frequency-modulated luminance signal with said frequency-converted chrominance signal and said pilot signal to provide a single combined signal, means for magnetically recording said combined signal and for magnetically reproducing the same, means for extracting said frequency-modulated luminance signal, said frequency-converted chrominance signal and said pilot signal from the reproduced combined signal, means for demodulating the extracted frequencymodulated luminance signal, means responsive to variations in the amplitude of the extracted pilot signal to control the amplitude of the extracted frequency-converted chrominance signal, means receiving the extracted pilot signal to reconvert the amplitudecontrolled chrominance signal to substantially its original frequency band and means combining the demodulated luminance signal with the reconverted chrominance signal so as to reconstitute the composite color video signal therefrom.
Claim 3
Independent Claim
345 words
A system for recording and reproducing a composite color video signal consisting of a luminance signal and a modulated chrominance signal having its frequency band within that of the luminance signal, comprising means for extracting said luminance and chrominance signals from said composite signal, means for frequency modulating said luminance signal, means for frequency converting said chrominance signal to a frequency band juxtaposed to the lower limit of the frequency bandwidth of the frequency-modulated luminance signal, said means for frequency converting the chrominance signal extracted from the composite color video signal including means extracting a burst signal from said chrominance signal, first oscillator means locked by said burst signal to produce a first frequency signal at a frequency which is an odd multiple of one-half the horizontal scanning frequency, second oscillator means producing a second frequency signal at a frequency which is also an odd multiple of one-half said horizontal scanning frequency, means combining said first and second frequency signals to provide a third frequency signal at a frequency which is the result of the frequencies of said first and second signals and means to beat down said modulated chrominance signal extracted from the composite color video signal with said third frequency signal, means for producing a pilot signal with a frequency band lower than that of the frequency-converted chrominance signal, means for combining said frequency-modulated luminance signal with said frequency-converted chrominance signal and said pilot signal to provide a combined signal, means for magnetically recording said combined signal and for magnetically reproducing the same, means for extracting said frequency-modulated luminance signal, said frequency-converted chrominance signal and said pilot signal from the reproduced combined signal, means for demodulating the extracted frequency-modulated luminance signal, means responsive to variations in the amplitude of the extracted pilot signal to control the amplitude of the extracted frequency-converted chrominance signal, means receiving the extracted pilot signal to reconvert the amplitude-controlled chrominance signal to substantially its original frequency band, and means combining the demodulated luminance signal with the reconverted chrominance signal so as to reconstitute the composite color video signal therefrom.
Claim 4
Independent Claim
345 words
A system for recording and reproducing a composite color video signal consisting of a luminance signal and a modulated chrominance signal having its frequency band within that of the luminance signal, comprising means for extracting said luminance and chrominance signals from said composite signal, means for frequency modulating said luminance signal, means for frequency converting said chrominance signal to a frequency band juxtaposed to the lower limit of the frequency bandwidth of the frequency-modulated luminance signal, said means for frequency converting the chrominance signal extracted from the composite color video signal including means extracting a burst signal from said chrominance signal, first oscillator means locked by said burst signal to produce a first frequency signal at a frequency which is an odd multiple of one-half the horizontal scanning frequency, second oscillator means producing a second frequency signal at a frequency which is also an odd multiple of one-half said horizontal scanning frequency, means combining said first and second frequency signals to provide a third frequency signal at a frequency which is the result of the frequencies of said first and second signals and means to beat down said modulated chrominance signal extracted from the composite color video signal with said third frequency signal, means for producing a pilot signal with a frequency band lower than that of the frequency-converted chrominance signal, means for combining said frequency-modulated luminance signal with said frequency-converted chrominance signal and said pilot signal to provide a combined signal, means for magnetically recording said combined signal and for magnetically reproducing the same, means for extracting said frequency-modulated luminance signal, said frequency-converted chrominance signal and said pilot signal from the reproduced combined signal, means for demodulating the extracted frequency-modulated luminance signal, means responsive to variations in the amplitude of the extracted pilot signal to control the amplitude of the extracted frequency-converted chrominance signal, means receiving the extracted pilot signal to reconvert the amplitude-controlled chrominance signal to substantially its original frequency band, and means combining the demodulated luminance signal with the reconverted chrominance signal so as to reconstitute the composite color video signal therefrom.
Claim 5
Dependent Claim
29 words
A system according to claim 2, in which said third frequency signal has a frequency which is the sum of said frequencies of the first and second frequency signals.
Claim 6
Dependent Claim
43 words
A syStem according to claim 3, in which said first frequency signal has a frequency substantially equal to that of subcarriers of said chrominance signal and said second frequency signal has a frequency substantially lower than said frequency of the first frequency signal.
Claim 7
Dependent Claim
23 words
A system according to claim 4, in which said means producing a pilot signal is constituted by means demultiplying said second frequency signal.
Claim 8
Dependent Claim
38 words
A system according to claim 2, in which, in said combined signal which is magnetically recorded, said frequency-converted chrominance signal has a level which is about 3 to 10 percent of the level of said frequency-modulated luminance signal.
Claim 9
Dependent Claim
31 words
A system according to claim 6, in which said level of said frequency-converted chrominance signal is at least as large as the level of said pilot signal in said combined signal.
Claim 10
Dependent Claim
106 words
A system according to claim 2, in which said means to reconvert the amplitude-controlled chrominance signal to substantially its original frequency band includes frequency multiplier means acting on said extracted pilot signal to provide a fourth frequency signal equal in frequency to said second frequency signal, means generating a fifth frequency signal equal in frequency to said first frequency signal, means combining said fourth and fifth frequency signals to provide a sixth frequency signal equal in frequency to said third frequency signal, and frequency converting means employing said sixth frequency signal to shift the frequency band of said amplitude-controlled chrominance signal to said original frequency band.
Claim 11
Independent Claim
121 words
A system for recording a composite color video signal consisting of a luminance signal and a modulated chrominance signal having its frequency band within that of the luminance signal, comprising means for extracting said luminance and chrominance signals from said composite signal, means for frequency modulating said luminance signal, means for frequency converting said chrominance signal to a frequency band juxtaposed to the lower limit of the frequency bandwidth of the frequency-modulated luminance signal, means for producing a pilot signal with a frequency band lower than that of the frequency-converted chrominance signal, means for combining said frequency-modulated luminance signal with said frequency-converted chrominance signal and said pilot signal to provide a single combined signal, means for magnetically recording said combined signal.
Claim 12
Independent Claim
121 words
A system for recording a composite color video signal consisting of a luminance signal and a modulated chrominance signal having its frequency band within that of the luminance signal, comprising means for extracting said luminance and chrominance signals from said composite signal, means for frequency modulating said luminance signal, means for frequency converting said chrominance signal to a frequency band juxtaposed to the lower limit of the frequency bandwidth of the frequency-modulated luminance signal, means for producing a pilot signal with a frequency band lower than that of the frequency-converted chrominance signal, means for combining said frequency-modulated luminance signal with said frequency-converted chrominance signal and said pilot signal to provide a single combined signal, means for magnetically recording said combined signal.
Claim 13
Independent Claim
248 words
A system for recording a composite color video signal consisting of first luminance signal and a modulated chrominance signal having its frequency band within that of the luminance signal, comprising means for extracting said luminance and chrominance signals from said composite signal, means for frequency modulating said luminance signal, means for frequency converting said chrominance signal to a frequency band juxtaposed to the lower limit of the frequency bandwidth of the frequency-modulated luminance signal, said means for frequency converting the chrominance signal extracted from the composite color video signal including means extracting a burst signal from said chrominance signal, first oscillator means locked by said first signal to produce a first frequency signal at a frequency which is an odd multiple of one-half the horizontal scanning frequency, second oscillator means producing a second frequency signal at a frequency which is also an odd multiple of one-half said horizontal scanning frequency, means combining said first and second frequency signals to provide a third frequency signal at a frequency which is the result of the frequencies of said first and second signals and means to beat down said modulated chrominance signal extracted from the composite color video signal with said third frequency signal, means for producing a pilot signal with a frequency band lower than that of the frequency-converted chrominance signal, means for combining said frequency-modulated luminance signal with said frequency-converted chrominance signal and said pilot signal to provide a combined signal, and means for magnetically recording said combined signal.
Claim 14
Independent Claim
248 words
A system for recording a composite color video signal consisting of first luminance signal and a modulated chrominance signal having its frequency band within that of the luminance signal, comprising means for extracting said luminance and chrominance signals from said composite signal, means for frequency modulating said luminance signal, means for frequency converting said chrominance signal to a frequency band juxtaposed to the lower limit of the frequency bandwidth of the frequency-modulated luminance signal, said means for frequency converting the chrominance signal extracted from the composite color video signal including means extracting a burst signal from said chrominance signal, first oscillator means locked by said first signal to produce a first frequency signal at a frequency which is an odd multiple of one-half the horizontal scanning frequency, second oscillator means producing a second frequency signal at a frequency which is also an odd multiple of one-half said horizontal scanning frequency, means combining said first and second frequency signals to provide a third frequency signal at a frequency which is the result of the frequencies of said first and second signals and means to beat down said modulated chrominance signal extracted from the composite color video signal with said third frequency signal, means for producing a pilot signal with a frequency band lower than that of the frequency-converted chrominance signal, means for combining said frequency-modulated luminance signal with said frequency-converted chrominance signal and said pilot signal to provide a combined signal, and means for magnetically recording said combined signal.
Claim 15
Dependent Claim
29 words
A system according to claim 10, in which said third frequency signal has a frequency which is the sum of said frequencies of the first and second frequency signals.
Claim 16
Dependent Claim
44 words
A system according to claim 11, in which said first frequency signal has a frequency substantially equal to that of the subcarriers of said chrominance signal and said second frequency signal has a frequency substantially lower than said frequency of the first frequency signal.
Claim 17
Dependent Claim
23 words
A system according to claim 12, in which said means producing a pilot signal is constituted by means demultiplying said second frequency signal.
Claim 18
Dependent Claim
38 words
A system according to claim 10, in which, in said combined signal which is magnetically recorded, said frequency-converted chrominance signal has a level which is about 3 to 10 percent of the level of said frequency-modulated luminance signal.
Claim 19
Dependent Claim
31 words
A system according to claim 14, in which said level of said frequency-converted chrominance signal is at least as large as the level of said pilot signal in said combined signal.
Claim 20
Independent Claim
175 words
A system for reproducing a composite color video signal consisting of a luminance signal and a modulated chrominance signal from a magnetically recorded combined signal consisting of a carrier frequency modulated with the luminance signal, the modulated chrominance signal having its frequency band converted so as to be juxtaposed to the lower limit of the bandwidth of the frequency-modulated luminance signal and a pilot signal having a frequency band below that of the frequency-converted chrominance signal, comprising means for magnetically reproducing said recorded combined signal, means for extracting said frequency-modulated luminance signal, said frequency-converted chrominance signal and said pilot signal from the reproduced combined signal, means for demodulating the extracted frequency-modulated luminance signal, means responsive to variations in the amplitude of the extracted pilot signal to control the amplitude of the extracted frequency-converted chrominance signal, means receiving the extracted pilot signal to reconvert the amplitude-controlled chrominance signal to substantially its original frequency band and means combining the demodulated luminance signal with the reconverted chrominance signal so as to reconstitute the composite color video signal therefrom.
Claim 21
Independent Claim
175 words
A system for reproducing a composite color video signal consisting of a luminance signal and a modulated chrominance signal from a magnetically recorded combined signal consisting of a carrier frequency modulated with the luminance signal, the modulated chrominance signal having its frequency band converted so as to be juxtaposed to the lower limit of the bandwidth of the frequency-modulated luminance signal and a pilot signal having a frequency band below that of the frequency-converted chrominance signal, comprising means for magnetically reproducing said recorded combined signal, means for extracting said frequency-modulated luminance signal, said frequency-converted chrominance signal and said pilot signal from the reproduced combined signal, means for demodulating the extracted frequency-modulated luminance signal, means responsive to variations in the amplitude of the extracted pilot signal to control the amplitude of the extracted frequency-converted chrominance signal, means receiving the extracted pilot signal to reconvert the amplitude-controlled chrominance signal to substantially its original frequency band and means combining the demodulated luminance signal with the reconverted chrominance signal so as to reconstitute the composite color video signal therefrom.
Claim 22
Independent Claim
322 words
A system for reproducing a composite color video signal consisting of a luminance signal and a modulated chrominance signal from a magnetically recorded combined signal consisting consisting of a carrier frequency modulated with the luminance signal, the modulated chrominance signal having its frequency band converted so as to be juxtaposed to the lower limit of the bandwidth of the frequency-modulated luminance signal and a pilot signal having a frequency band below that of the frequency-converted chrominance signal, comprising means for magnetically reproducing said recorded combined signal, means for extracting said frequency-modulated luminance signal, said frequency-converted chrominance signal and said pilot signal from the reproduced combined signal, means for demodulating the extracted frequency-modulated luminance signal, means responsive to variations in the amplitude of the extracted pilot signal to control the amplitude of the extracted frequency-converted chrominance signal, means receiving the extracted pilot signal to reconvert the amplitude-controlled chrominance signal to substantially its original frequency band, said means to reconvert the amplitude-controlled chrominance signal to substantially its original frequency band including oscillator means generating a frequency signal at a frequency equal to the desired subcarrier frequency of the modulated chrominance signal in the composite color video signal to be reproduced, frequency multiplier means multiplying said extracted pilot signal to a frequency equal to the control frequenCy of said frequency band of the frequency-converted chrominance signal, means producing a frequency signal having a frequency which is the result of the frequencies of said frequency signals from said oscillator means and said multiplier means, respectively, and frequency converting means receiving said amplitude-controlled chrominance signal and the last mentioned frequency signal to shift the frequency band of said amplitude-controlled chrominance signal by the extent of the difference of said last frequency signal from the control frequency of said frequency band of the frequency-converted chrominance signal, and means combining the demodulated luminance signal with the reconverted chrominance signal so as to reconstitute the composite color video signal therefrom.
Claim 23
Independent Claim
322 words
A system for reproducing a composite color video signal consisting of a luminance signal and a modulated chrominance signal from a magnetically recorded combined signal consisting consisting of a carrier frequency modulated with the luminance signal, the modulated chrominance signal having its frequency band converted so as to be juxtaposed to the lower limit of the bandwidth of the frequency-modulated luminance signal and a pilot signal having a frequency band below that of the frequency-converted chrominance signal, comprising means for magnetically reproducing said recorded combined signal, means for extracting said frequency-modulated luminance signal, said frequency-converted chrominance signal and said pilot signal from the reproduced combined signal, means for demodulating the extracted frequency-modulated luminance signal, means responsive to variations in the amplitude of the extracted pilot signal to control the amplitude of the extracted frequency-converted chrominance signal, means receiving the extracted pilot signal to reconvert the amplitude-controlled chrominance signal to substantially its original frequency band, said means to reconvert the amplitude-controlled chrominance signal to substantially its original frequency band including oscillator means generating a frequency signal at a frequency equal to the desired subcarrier frequency of the modulated chrominance signal in the composite color video signal to be reproduced, frequency multiplier means multiplying said extracted pilot signal to a frequency equal to the control frequenCy of said frequency band of the frequency-converted chrominance signal, means producing a frequency signal having a frequency which is the result of the frequencies of said frequency signals from said oscillator means and said multiplier means, respectively, and frequency converting means receiving said amplitude-controlled chrominance signal and the last mentioned frequency signal to shift the frequency band of said amplitude-controlled chrominance signal by the extent of the difference of said last frequency signal from the control frequency of said frequency band of the frequency-converted chrominance signal, and means combining the demodulated luminance signal with the reconverted chrominance signal so as to reconstitute the composite color video signal therefrom.
Claim 24
Dependent Claim
33 words
A system according to claim 17, in which said frequency of the last frequency signal is the sum of said frequencies of the frequency signals from said oscillator means and said multiplier means.
Claim 25
Independent Claim
124 words
A system for recording a composite color video signal consisting of a luminance signal and a modulated chrominance signal having its frequency band within that of the luminance signal, comprising means for extracting said luminance and chrominance signals from said composite signal, means for frequency modulating said luminance signal, means for frequency converting said chrominance signal to a frequency band juxtaposed to the lower limit of the frequency bandwidth of the frequency-modulated luminance signal, means for combining said frequency-modulated luminance signal with said frequency-converted chrominance signal to provide a single combined signal in which said frequency-converted chrominance signal has a level which is about 3 to 10 percent of the level of said frequency-modulated luminance signal, and means for magnetically recording said combined signal.
Claim 26
Independent Claim
124 words
A system for recording a composite color video signal consisting of a luminance signal and a modulated chrominance signal having its frequency band within that of the luminance signal, comprising means for extracting said luminance and chrominance signals from said composite signal, means for frequency modulating said luminance signal, means for frequency converting said chrominance signal to a frequency band juxtaposed to the lower limit of the frequency bandwidth of the frequency-modulated luminance signal, means for combining said frequency-modulated luminance signal with said frequency-converted chrominance signal to provide a single combined signal in which said frequency-converted chrominance signal has a level which is about 3 to 10 percent of the level of said frequency-modulated luminance signal, and means for magnetically recording said combined signal.
Claim 27
Dependent Claim
135 words
A system according to claim 19, in which said means for frequency converting the chrominance signal extracted from the composite color video signal includes means extracting a burst signal from said chrominance signal, first oscillator means locked by said first signal to produce a first frequency signal at a frequency which is an odd multiple of one-half the horizontal scanning frequency, second oscillator means producing a second frequency signal at a frequency which is also an odd multiple of one-half said horizontal scanning frequency, means combining said first and second frequency signals to provide a third frequency signal at a frequency which is the result of the frequencies of said first and second signals, and means to beat down said modulated chrominance signal extracted from the composite color video signal with said third frequency signal.
Claim 28
Dependent Claim
29 words
A system according to claim 20, in which said third frequency signal has a frequency which is the sum of said frequencies of the first and second frequency signals.
Claim 29
Dependent Claim
44 words
A system according to claim 21, in which said first frequency signal has a frequency substantially equal to that of the subcarriers of said chrominance signal and said second frequency signal has a frequency substantially lower than said frequency of the first frequency signal.
References Cited (Backward Citations)
US3359364A
Cited
US3381083A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |