US4772938A
Expired / Lapsed
US
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Color video signal frame store
Assignee: Eastman Kodak Co
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Filing: 1986-10-03
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Granted: 1988-09-20
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Expires: 2006-10-03
Abstract
Abstract Color video signal apparatus includes a digital memory for storing a frame of color video signal in a fast and efficient manner. A composite color video signal is separated into a luminance and two chrominance signals. A luminance analog to digital converter (ADC) converts the luminance signal into an N bit digital signal at a sampling frequency F. A chrominance ADC converts each of the two chrominance signals into an M bit digital signal having a sampling frequency 1/4 F, where M is an even integer. N bits of a sample of the digital luminance signal and 1/2 M bits of a sample of one of the two digital chrominance signals are simultaneously written into the memory. For each set of four successive N bit samples of digital luminance signal written into memory, an M bit sample of each of the two digital chrominance signals is also written into the memory. The invention is useful in video cassette recorders.
Inventors
- 👤 Steven J. Sasson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:40
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/79; H04N9/87; H04N9/877
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
150 words
Color video signal apparatus comprising: means for providing a color video signal including an analog luminance signal and two analog chrominance signals; analog-to-digital converter means (1) for converting said analog luminance signal into an N bit digital luminance signal having a sampling frequency F and (2) for converting each of said two analog chrominance signals into an M bit digital chrominance signal having a sampling frequency 1/4 F, where M is an even integer; a digital memory; and means for storing in said digital memory N bits of a sample of said digital luminance signal and simultaneously 1/2 M bits of a sample of one of the two digital chrominance signals such that for each set of four successive N bit samples of said digital luminance signal stored in said digital memory, an M bit digital sample of each of said two digital chrominance signals is stored in said memory.
Claim 2
Dependent Claim
150 words
Color video signal apparatus comprising: means for providing a color video signal including an analog luminance signal and two analog chrominance signals; analog-to-digital converter means (1) for converting said analog luminance signal into an N bit digital luminance signal having a sampling frequency F and (2) for converting each of said two analog chrominance signals into an M bit digital chrominance signal having a sampling frequency 1/4 F, where M is an even integer; a digital memory; and means for storing in said digital memory N bits of a sample of said digital luminance signal and simultaneously 1/2 M bits of a sample of one of the two digital chrominance signals such that for each set of four successive N bit samples of said digital luminance signal stored in said digital memory, an M bit digital sample of each of said two digital chrominance signals is stored in said memory.
Claim 3
Dependent Claim
35 words
The apparatus of claim 1 including means for multiplexing said two analog chrominance signals so as to supply to said converter means a multiplexed chrominance signal having alternating samples of said two analog chrominance signals.
Claim 4
Dependent Claim
25 words
The apparatus of claim 2 wherein said converter means converts each sample of said multiplexed chrominance signal into two successive M/2 bit digital chrominance signals.
Claim 5
Dependent Claim
20 words
The apparatus of claim 1 wherein said digital memory is capable of storing a frame of a color video signal.
Claim 6
Dependent Claim
40 words
The apparatus of claim 4 wherein said digital memory comprises a dynamic random access memory and includes means for addressing said memory so that a single address is effective in storing a plurality of sequential data samples into said memory.
Claim 7
Dependent Claim
165 words
Color video signal frame store apparatus comprising: means for providing a color video signal including an analog luminance (Y) signal and two analog chrominance (C', C") signals; luminance analog-to-digital converter (ADC) means for converting said analog luminance signal into an N bit digital luminance signal having a sampling frequency F; chrominance analog-to-digital converter (ADC) means for converting each of said two analog chrominance signals into an M bit digital chrominance signal having a sampling frequency 1/4F where M is an even integer; a digital memory for storing a frame of said color video signal; and means for simultaneously writing into said digital memory N bits of a sample of said digital luminance signal and 1/2 M bits of a sample one of the two digital chrominance signals such that for each set of four successive N bit samples of said digital luminance signal written into said memory, an M bit digital sample of each of said two digital chrominance signals is written into said memory.
Claim 8
Dependent Claim
165 words
Color video signal frame store apparatus comprising: means for providing a color video signal including an analog luminance (Y) signal and two analog chrominance (C', C") signals; luminance analog-to-digital converter (ADC) means for converting said analog luminance signal into an N bit digital luminance signal having a sampling frequency F; chrominance analog-to-digital converter (ADC) means for converting each of said two analog chrominance signals into an M bit digital chrominance signal having a sampling frequency 1/4F where M is an even integer; a digital memory for storing a frame of said color video signal; and means for simultaneously writing into said digital memory N bits of a sample of said digital luminance signal and 1/2 M bits of a sample one of the two digital chrominance signals such that for each set of four successive N bit samples of said digital luminance signal written into said memory, an M bit digital sample of each of said two digital chrominance signals is written into said memory.
Claim 9
Dependent Claim
29 words
The apparatus of claim 6 wherein each time said memory is addressed, said writing means writes a sequence of more than one N+M/2 bit digital sample into said memory.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |