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US4506286A
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PAL digital video signal processing arrangement
Assignee: NEC Corp
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Filing: 1982-10-26
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Granted: 1985-03-19
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Expires: 2002-10-26
Abstract
Abstract A PAL digital video signal processing arrangement includes converter circuitry for sampling a PAL system video signal in response to sampling pulses having sampling points associated with ±U and ±V modulation axes on a color vector plane to convert an analog composite video signal containing a luminance signal and a color subcarrier into a digital video signal, and a modulation axis inverting configuration for inverting the polarity of the digitized color subcarrier at the sampling points associated with the ±V axis.
Inventors
- 👤 Kazuo Kashigi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:32
CPC Classifications
H; H04; H04N; H04N11/00; H04N11/06; H04N11/12; H04N11/14; H04N11/16; H04N11/165
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
56 words
A PAL video signal processor comprising: converter means for converting a color subcarrier into a digital signal, said color subcarrier being sampled at sampling points associated with ±U and ±V axes on a color vector plane; and inverter means for inverting the polarity of said digital signal at the sampling points associated with the ±V axis.
Claim 2
Dependent Claim
56 words
A PAL video signal processor comprising: converter means for converting a color subcarrier into a digital signal, said color subcarrier being sampled at sampling points associated with ±U and ±V axes on a color vector plane; and inverter means for inverting the polarity of said digital signal at the sampling points associated with the ±V axis.
Claim 3
Dependent Claim
100 words
A PAL video signal processing arrangement comprising: converter means for converting a color subcarrier into a color subcarrier, said digital signal being sampled at sampling points associated with ±U and ±V axes on a color vector plane and said digital signal consisting of a plurality of parallel bits; means for generating a timing signal associated with ±V axis; a plurality of exclusive OR gates each for receiving said timing signal and a respective one of said parallel bits; and means for adding the timing signal to the least significant bit of the outputs of said plurality of exclusive OR gates.
Claim 4
Dependent Claim
100 words
A PAL video signal processing arrangement comprising: converter means for converting a color subcarrier into a color subcarrier, said digital signal being sampled at sampling points associated with ±U and ±V axes on a color vector plane and said digital signal consisting of a plurality of parallel bits; means for generating a timing signal associated with ±V axis; a plurality of exclusive OR gates each for receiving said timing signal and a respective one of said parallel bits; and means for adding the timing signal to the least significant bit of the outputs of said plurality of exclusive OR gates.
Claim 5
Dependent Claim
52 words
The PAL video signal processing arrangement as claimed in claim 2, wherein said sampling points are determined by a sampling pulse having a frequency of four times as much as the frequency of said subcarrier and said timing signal generating means includes a flip-flop receiving the sampling pulse as a clock thereof.
Claim 6
Dependent Claim
104 words
A PAL video signal processor receiving a digitized color subcarrier sampled at sampling points associated with ±U and ±V axes of a color vector plane, said processor comprising: first means for delaying said digitized color subcarrier by one horizontal scanning period to provide a first delayed signal; means for inverting the polarity of said first delayed signal at the sample points associated with ±V axes to provide an inverted first delayed signal; second means for delaying said digitized color subcarrier by one sample period to provide a second delayed signal; and means for averaging the inverted first delayed signal and the second delayed signal.
Claim 7
Dependent Claim
104 words
A PAL video signal processor receiving a digitized color subcarrier sampled at sampling points associated with ±U and ±V axes of a color vector plane, said processor comprising: first means for delaying said digitized color subcarrier by one horizontal scanning period to provide a first delayed signal; means for inverting the polarity of said first delayed signal at the sample points associated with ±V axes to provide an inverted first delayed signal; second means for delaying said digitized color subcarrier by one sample period to provide a second delayed signal; and means for averaging the inverted first delayed signal and the second delayed signal.
Claim 8
Dependent Claim
81 words
A PAL video signal processor as recited in claim 4, wherein said sampled digitized color subcarrier comprises a plurality of parallel bits, and said means for inverting comprises: a means for generating a timing signal associated with the ±V axes; a plurality of exclusive OR gates each receiving said timing signal and a respective one of said parallel bits; and means for adding said timing signal to the least significant bit of the outputs of said plurality of exclusive OR gates.
Claim 9
Dependent Claim
46 words
A PAL video signal processor as recited in claim 4, wherein said means for averaging comprises: an adder for adding said first delayed signal to said second delayed signal to provide a sum signal; and a multiplier for multiplying said sum signal by a predetermined coefficient.
Claim 10
Dependent Claim
84 words
A PAL video signal processor for receiving and processing a digitized color subcarrier sampled at sampling points associated with ±U and ±V axes of a color vector plane, said processor comprising: inverting means for inverting the polarity of said digitized color subcarrier sampled at sampling points corresponding to ±V axes; and processing means for processing said digitized color subcarrier sampled at sampling points corresponding to said ±U axes together with the inverted digitized color subcarrier sampled at sampling points corresponding to said ±V axes.
Claim 11
Dependent Claim
84 words
A PAL video signal processor for receiving and processing a digitized color subcarrier sampled at sampling points associated with ±U and ±V axes of a color vector plane, said processor comprising: inverting means for inverting the polarity of said digitized color subcarrier sampled at sampling points corresponding to ±V axes; and processing means for processing said digitized color subcarrier sampled at sampling points corresponding to said ±U axes together with the inverted digitized color subcarrier sampled at sampling points corresponding to said ±V axes.
References Cited (Backward Citations)
US4322739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-18 | 1988-09-17 | 1989-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-18 | 1992-09-17 | 1993-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-18 | 1996-09-17 | 1997-03-19 | $7700.00 | Window Closed / Lapsed |