US3863264A
Expired / Lapsed
US
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Sequential color and memory decoder
Assignee: Tektronix Inc
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Filing: 1973-05-15
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Granted: 1975-01-28
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Expires: 1993-05-15
Abstract
Abstract A SECAM decoder for deriving the signals for a color display from the composite color picture signal determined largely by digital means having digital line switching, multiple delay lines, decoder center frequency clamps and indicator of drift of encoded white, dual digital phase detector for each phased locked loop decoder, and a waveform squaring circuit whereby ease of adjustment to different recording subcarrier frequencies or to sequence color and memory standards is provided.
Inventors
- 👤 Larry A Nelson
- 👤 Philip Stephen Crosby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:12
CPC Classifications
H; H03; H03G; H03G11/00; H03G11/06; H03K; H03K3/00; H03K3/02; H03K3/027; H04; H04N; H04N11/00; H04N11/06; H04N11/18; H04N11/186
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
317 words
In a SECAM television system, a decoder for decoding a composite video signal for display, comprising: separation means for separating the composite video signal into a luminance signal and a chrominance signal; amplifier and delay means for receiving said luminance signal, said amplifier and delay means providing an amplified and delayed luminance signal; first conversion means for converting said chrominance signal to a first digital signal having two stable states, said digital signal preserving the zero crossings of said chrominance signal; a plurality of delay means for continuously recording said first digital signal to provide a plurality of second chrominance signals; a plurality of second conversion means for converting said plurality of second chrominance signals to a plurality of second digital signals having two stable states, said plurality of digital signals preserving the zero crossings of said plurality of chrominance signals; a plurality of switch means for sequentially routing said first digital signal and said plurality of second digital signals; a plurality of dual demodulator means for sequentially receiving said first digital signal and said plurality of said second digital signals sequentially via said plurality of switch means and a reference signal, said plurality of dual demodulator means providing a plurality of output voltages proportional to the phase difference between the sequentially received said first digital signal and said reference signal, and proportional to the phase difference between the sequentially received said plurality of second digital signals and said reference signal; a plurality of de-emphasis means for receiving said plurality of output voltages, said de-emphasis means for providing a plurality of de-emphasized color difference signals; matricing means for receiving said plurality of de-emphasized color difference signals, said matricing means providing an additional color diFference signal; and image means for receiving said amplified and delayed luminance signal, said plurality of de-emphasized color difference signals and said additional color difference signal, said image means for displaying the received signals.
Claim 2
Dependent Claim
317 words
In a SECAM television system, a decoder for decoding a composite video signal for display, comprising: separation means for separating the composite video signal into a luminance signal and a chrominance signal; amplifier and delay means for receiving said luminance signal, said amplifier and delay means providing an amplified and delayed luminance signal; first conversion means for converting said chrominance signal to a first digital signal having two stable states, said digital signal preserving the zero crossings of said chrominance signal; a plurality of delay means for continuously recording said first digital signal to provide a plurality of second chrominance signals; a plurality of second conversion means for converting said plurality of second chrominance signals to a plurality of second digital signals having two stable states, said plurality of digital signals preserving the zero crossings of said plurality of chrominance signals; a plurality of switch means for sequentially routing said first digital signal and said plurality of second digital signals; a plurality of dual demodulator means for sequentially receiving said first digital signal and said plurality of said second digital signals sequentially via said plurality of switch means and a reference signal, said plurality of dual demodulator means providing a plurality of output voltages proportional to the phase difference between the sequentially received said first digital signal and said reference signal, and proportional to the phase difference between the sequentially received said plurality of second digital signals and said reference signal; a plurality of de-emphasis means for receiving said plurality of output voltages, said de-emphasis means for providing a plurality of de-emphasized color difference signals; matricing means for receiving said plurality of de-emphasized color difference signals, said matricing means providing an additional color diFference signal; and image means for receiving said amplified and delayed luminance signal, said plurality of de-emphasized color difference signals and said additional color difference signal, said image means for displaying the received signals.
Claim 3
Dependent Claim
222 words
In a SECAM television system, a decoder for decoding a composite video signal for display wherein the composite video signal is separated into a chrominance signal and a luminance signal, and wherein the chrominance signal is continuously recorded and switched to produce two chrominance signals simultaneously which are limited and demodulated to supply output signals which are proportional to the deviation in the instantaneous frequency of the subcarrier of the composite video signal, and wherein the proportional signals are de-emphasized and by matricing produce color difference signals which are combined with the luminance signal in a display device, wherein the impovement comprises: means for converting the chrominance signal into a digital signal, said digital signal preserving the zero crossings of the chrominance signal; a plurality of means for continuously processing said digital signal to produce a plurality of chrominance signals simultaneously; a plurality of means for converting said plurality of chrominance signals into a plurality of digital signals preserving the zero crossings of said plurality of chrominance signals; a plurality of switches to sequentially route said digital signal and said plurality of digital signals; and a plurality of digital demodulators to receive the sequentially routed signals, said digital demodulators to supply the output signals which are proportional to the deviation in the instantaneous frequency of the subcarrier of the composite video signal.
Claim 4
Dependent Claim
222 words
In a SECAM television system, a decoder for decoding a composite video signal for display wherein the composite video signal is separated into a chrominance signal and a luminance signal, and wherein the chrominance signal is continuously recorded and switched to produce two chrominance signals simultaneously which are limited and demodulated to supply output signals which are proportional to the deviation in the instantaneous frequency of the subcarrier of the composite video signal, and wherein the proportional signals are de-emphasized and by matricing produce color difference signals which are combined with the luminance signal in a display device, wherein the impovement comprises: means for converting the chrominance signal into a digital signal, said digital signal preserving the zero crossings of the chrominance signal; a plurality of means for continuously processing said digital signal to produce a plurality of chrominance signals simultaneously; a plurality of means for converting said plurality of chrominance signals into a plurality of digital signals preserving the zero crossings of said plurality of chrominance signals; a plurality of switches to sequentially route said digital signal and said plurality of digital signals; and a plurality of digital demodulators to receive the sequentially routed signals, said digital demodulators to supply the output signals which are proportional to the deviation in the instantaneous frequency of the subcarrier of the composite video signal.
Claim 5
Dependent Claim
27 words
The decoder according to claim 2 wherein said plurality of means for continuously processing said digital signal defines a delay line to continuously record said digital signal.
Claim 6
Dependent Claim
283 words
A SECAM decoder in which the improvement comprises: a separation means for separating a composite video signal into a first portion corresponding to luminance information and a second portion corresponding to chrominance information; amplifier and delay means for amplifying and delaying said first portion; image means for receiving the amplified and delayed first portion whereby an image is determined by such portion; conversion means for changing said second portion into a second signal having two stable states; first switch means to route said second signal; delay means for delaying said second signal; additional conversion means for changing the delayed signal into a third signal having two stable states; second switch means for routing said second signal and said third signals; first demodulation means for receiving in sequence said second signal and said third signal to produce an output thereoutof; second demodulation means for receiving in sequence said second signal and said third signal to produce an output thereoutof; first de-emphasis means for receiving said first demodulation output wherein the low frequency components of each signal are de-emphasized in a manner directly opposite to any pre-emphasis of the composite video signal; second de-emphasis means for receiving said second demodulator output wherein the low frequency components of such signal are de-emphasized in a manner directly opposite to any pre-emphasis of the composite video signal; combination means for receiving the outputs of said first and second de-emphasis means to produce an output thereoutof which corresponds to the algebraic sum of said outputs; and means for applying the outputs of said first and second de-emphasis means and the output of said combination means to said image means separate from said first portion of said composite video signal.
Claim 7
Dependent Claim
283 words
A SECAM decoder in which the improvement comprises: a separation means for separating a composite video signal into a first portion corresponding to luminance information and a second portion corresponding to chrominance information; amplifier and delay means for amplifying and delaying said first portion; image means for receiving the amplified and delayed first portion whereby an image is determined by such portion; conversion means for changing said second portion into a second signal having two stable states; first switch means to route said second signal; delay means for delaying said second signal; additional conversion means for changing the delayed signal into a third signal having two stable states; second switch means for routing said second signal and said third signals; first demodulation means for receiving in sequence said second signal and said third signal to produce an output thereoutof; second demodulation means for receiving in sequence said second signal and said third signal to produce an output thereoutof; first de-emphasis means for receiving said first demodulation output wherein the low frequency components of each signal are de-emphasized in a manner directly opposite to any pre-emphasis of the composite video signal; second de-emphasis means for receiving said second demodulator output wherein the low frequency components of such signal are de-emphasized in a manner directly opposite to any pre-emphasis of the composite video signal; combination means for receiving the outputs of said first and second de-emphasis means to produce an output thereoutof which corresponds to the algebraic sum of said outputs; and means for applying the outputs of said first and second de-emphasis means and the output of said combination means to said image means separate from said first portion of said composite video signal.
Claim 8
Dependent Claim
34 words
The SECAM decoder according to claim 1 wherein said image means produces an image proportional to the outputs of saId first and second de-emphasis means and the output of said amplifier and delay means.
Claim 9
Dependent Claim
32 words
Th SECAM decoder according to claim 4 wherein said separation means defines a bandpass filter for separating the composite video signal and further defining a ''''Bell'''' filter for de-emphasizing high frequency components.
Claim 10
Dependent Claim
19 words
The SECAM decoder according to claim 4 wherein said second portion defining chrominance is the modulated color difference signal.
Claim 11
Dependent Claim
18 words
The second portion according to claim 7 wherein said color difference signal defines modulated D''R or D''B sequentially.
Claim 12
Dependent Claim
31 words
The SECAM decoder according to claim 4 wherein said first and additional conversion means defines a plurality identical waveform squaring circuits, said circuits preserving the zero crossings of said second portion.
Claim 13
Dependent Claim
17 words
The SECAM decoder according to claim 4 wherein said delay means defines a plurality of delay lines.
Claim 14
Dependent Claim
19 words
The delay means according to claim 10 wherein said plurality of delay lines can be electrical, mechanical, or both.
Claim 15
Dependent Claim
20 words
The SECAM decoder according to claim 4 wherein said first and second switch means defines a plurality of logic devices.
Claim 16
Dependent Claim
25 words
The SECAM decoder according to claim 4 wherein said first and second demodulation means define digital phase lock loop demodulators having dual digital detector means.
Claim 17
Dependent Claim
14 words
The SECAM decoder according to claim 4 wherein said image means defines a cathode-ray-tube.
Claim 18
Dependent Claim
16 words
The image means according to claim 13 wherein said cathode-ray-tube is a television color picture tube.
References Cited (Backward Citations)
US3267208A
Cited
US3773971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |