US3720780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pcm digital color television system
Assignee: Office de Radiodiffusion-Television Francaise
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Filing: 1971-08-30
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Granted: 1973-03-13
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Expires: 1991-08-30
Abstract
Abstract Digital PCM coded color television system in which the image is transmitted at a rate of two bits per image point. The luminance is transmitted by a word of p bits every p/2 points and the luminance increments corresponding to the ''''image contour points'''' are transmitted by two bits. Color words which are formed of samples of two color components of the image are stored in color transmit storing means and the addresses of the color words in said storing means are transmitted in lieu of the color words themselves. A receive storing means is provided at the receiver station and it is updated from the transmit storing means during the line blanking periods.
Inventors
- 👤 M Remy
- 👤 D Tartary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:47
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/08; H04N7/084; H04N7/085; H04N11/00; H04N11/04; H04N11/042; H04N19/00; H04N19/90; H04N19/94; H04N19/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
338 words
A digital PCM coded color television system comprising: a. at a transmitter station, means for analyzing, during line analyzing periods separated by blanking periods, the lines of a color object to be transmitted and for generating an analog signal representative of the luminance of the lines of the object, b. means for continuously detecting the amplitude of the variation undergone by said analog luminance signal during a predetermined time and thereby forming an analog signal representative of the increments of tHe luminance of the lines of the object, c. means for converting said analog luminance signal and said analog luminance increment signal respectively into a digital luminance ACM signal and a digital luminance increment PCM signal, d. means for deriving from the color object to be transmitted two independent analog chrominance signals and for converting the same into two associated digital chrominance PCM signals, said two associated digital chrominance PCM signals forming chrominance word signal, e. a generating means for generating addresses and a transmit storing means for storing at predetermined addresses generated by said generating means the chrominance word signals, said transmit storing means including means for transmitting said chrominance word signals during the blanking periods, f. means for transmitting said digital luminance PCM signal and said digital luminance increment PCM signal and the addresses of the chrominance word signals during the line analyzing periods; g. at a receiver station, means for receiving the signal transmitted from the transmitter station, h. means for deriving from said digital luminance PCM signal and said digital luminance increment PCM signal, an analog signal representative of the luminance of the lines of the object, i. a receiver storing means including supplying means for supplying address signals to the storing means of said receiver and means for storing at the addresses transmitted from said transmitter station, during the line analyzing periods, the chrominance word signals transmitted therefrom during the blanking periods, j. and means for deriving two independent analog chrominance signals from the chrominance word signals stored in said receive storing means.
Claim 2
Dependent Claim
338 words
A digital PCM coded color television system comprising: a. at a transmitter station, means for analyzing, during line analyzing periods separated by blanking periods, the lines of a color object to be transmitted and for generating an analog signal representative of the luminance of the lines of the object, b. means for continuously detecting the amplitude of the variation undergone by said analog luminance signal during a predetermined time and thereby forming an analog signal representative of the increments of tHe luminance of the lines of the object, c. means for converting said analog luminance signal and said analog luminance increment signal respectively into a digital luminance ACM signal and a digital luminance increment PCM signal, d. means for deriving from the color object to be transmitted two independent analog chrominance signals and for converting the same into two associated digital chrominance PCM signals, said two associated digital chrominance PCM signals forming chrominance word signal, e. a generating means for generating addresses and a transmit storing means for storing at predetermined addresses generated by said generating means the chrominance word signals, said transmit storing means including means for transmitting said chrominance word signals during the blanking periods, f. means for transmitting said digital luminance PCM signal and said digital luminance increment PCM signal and the addresses of the chrominance word signals during the line analyzing periods; g. at a receiver station, means for receiving the signal transmitted from the transmitter station, h. means for deriving from said digital luminance PCM signal and said digital luminance increment PCM signal, an analog signal representative of the luminance of the lines of the object, i. a receiver storing means including supplying means for supplying address signals to the storing means of said receiver and means for storing at the addresses transmitted from said transmitter station, during the line analyzing periods, the chrominance word signals transmitted therefrom during the blanking periods, j. and means for deriving two independent analog chrominance signals from the chrominance word signals stored in said receive storing means.
Claim 3
Dependent Claim
338 words
A digital PCM coded color television system comprising: a. at a transmitter station, means for analyzing, during line analyzing periods separated by blanking periods, the lines of a color object to be transmitted and for generating an analog signal representative of the luminance of the lines of the object, b. means for continuously detecting the amplitude of the variation undergone by said analog luminance signal during a predetermined time and thereby forming an analog signal representative of the increments of tHe luminance of the lines of the object, c. means for converting said analog luminance signal and said analog luminance increment signal respectively into a digital luminance ACM signal and a digital luminance increment PCM signal, d. means for deriving from the color object to be transmitted two independent analog chrominance signals and for converting the same into two associated digital chrominance PCM signals, said two associated digital chrominance PCM signals forming chrominance word signal, e. a generating means for generating addresses and a transmit storing means for storing at predetermined addresses generated by said generating means the chrominance word signals, said transmit storing means including means for transmitting said chrominance word signals during the blanking periods, f. means for transmitting said digital luminance PCM signal and said digital luminance increment PCM signal and the addresses of the chrominance word signals during the line analyzing periods; g. at a receiver station, means for receiving the signal transmitted from the transmitter station, h. means for deriving from said digital luminance PCM signal and said digital luminance increment PCM signal, an analog signal representative of the luminance of the lines of the object, i. a receiver storing means including supplying means for supplying address signals to the storing means of said receiver and means for storing at the addresses transmitted from said transmitter station, during the line analyzing periods, the chrominance word signals transmitted therefrom during the blanking periods, j. and means for deriving two independent analog chrominance signals from the chrominance word signals stored in said receive storing means.
Claim 4
Dependent Claim
338 words
A digital PCM coded color television system comprising: a. at a transmitter station, means for analyzing, during line analyzing periods separated by blanking periods, the lines of a color object to be transmitted and for generating an analog signal representative of the luminance of the lines of the object, b. means for continuously detecting the amplitude of the variation undergone by said analog luminance signal during a predetermined time and thereby forming an analog signal representative of the increments of tHe luminance of the lines of the object, c. means for converting said analog luminance signal and said analog luminance increment signal respectively into a digital luminance ACM signal and a digital luminance increment PCM signal, d. means for deriving from the color object to be transmitted two independent analog chrominance signals and for converting the same into two associated digital chrominance PCM signals, said two associated digital chrominance PCM signals forming chrominance word signal, e. a generating means for generating addresses and a transmit storing means for storing at predetermined addresses generated by said generating means the chrominance word signals, said transmit storing means including means for transmitting said chrominance word signals during the blanking periods, f. means for transmitting said digital luminance PCM signal and said digital luminance increment PCM signal and the addresses of the chrominance word signals during the line analyzing periods; g. at a receiver station, means for receiving the signal transmitted from the transmitter station, h. means for deriving from said digital luminance PCM signal and said digital luminance increment PCM signal, an analog signal representative of the luminance of the lines of the object, i. a receiver storing means including supplying means for supplying address signals to the storing means of said receiver and means for storing at the addresses transmitted from said transmitter station, during the line analyzing periods, the chrominance word signals transmitted therefrom during the blanking periods, j. and means for deriving two independent analog chrominance signals from the chrominance word signals stored in said receive storing means.
Claim 5
Dependent Claim
87 words
A digital coded color television system according to claim 1 in which the means for continuously detecting the amplitude of the variation undergone by the analog luminance signal and thereby forming an analog signal representative of the increments of the luminance of the lines of the object comprises means for scanning the lines of said object and forming a video signal, means for applying said video signal to a crispener device generating a signal equal to the second derivative of said video signal with respect to time.
Claim 6
Dependent Claim
31 words
A digital PCM coded color television system according to claim 1 in which the two independent analog chrominance signals are the I-signal and the Q-signal of the NTSC color television system.
Claim 7
Dependent Claim
51 words
A digital PCM coded television system according to claim 1 in which the two independent analog chrominance signals are the difference signals (R-Y) and (B-Y) of the PAL and SECAM color television systems in which R and B are respectively the red and blue component signals and Y the luminance signal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |