US3864723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for processing chrominance signals
Assignee: Panasonic Holdings Corp
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Filing: 1973-06-13
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Granted: 1975-02-04
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Expires: 1993-06-13
Abstract
Abstract A system for processing chrominance signals in a color television receiver which provides improved saturation of certain color levels without adversely effecting flesh tone color levels. The system includes circuitry for amplifying the color difference signals representative of flesh tones at a first amplification or gain and for amplifying the color difference signals representative of other colors at an increased amplification or gain.
Inventors
- 👤 David H Carpenter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:07
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/643
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
234 words
A color television receiver adapted to receive a composite video signal having a chrominance signal and a luminance signal and for displaying a color image on a display device comprising chrominance demodulator means for providing a first color difference signal, a second color difference signal and a third color difference signal, a first non-linear amplifier connected to said first color difference signal, said first non-linear amplifier adapted to amplify said first color difference at a first amplification for first color difference signals less than a first predetermined amplitude and for increasing the amplification of said first color difference signal for first color difference signals greater than said first predetermined amplitude; a second non-linear amplifier connected to the output of said second color difference signal, said second non-linear amplifier adapted to amplify said second color difference signal at a first amplification for second color difference signals less than a first predetermined amplitude and for increasing the amplification of said second color difference signal for second color difference signals greater than said first predetermined amplitude; and a third non-linear amplifier connected to said third color difference signal, said third non-linear amplifier adapted to amplify said third color difference signal at a first amplification for third color difference signals less than a first predetermined amplitude and for increasing the amplification of said third color difference signals for third color difference signals greater than said first predetermined amplitude.
Claim 2
Dependent Claim
234 words
A color television receiver adapted to receive a composite video signal having a chrominance signal and a luminance signal and for displaying a color image on a display device comprising chrominance demodulator means for providing a first color difference signal, a second color difference signal and a third color difference signal, a first non-linear amplifier connected to said first color difference signal, said first non-linear amplifier adapted to amplify said first color difference at a first amplification for first color difference signals less than a first predetermined amplitude and for increasing the amplification of said first color difference signal for first color difference signals greater than said first predetermined amplitude; a second non-linear amplifier connected to the output of said second color difference signal, said second non-linear amplifier adapted to amplify said second color difference signal at a first amplification for second color difference signals less than a first predetermined amplitude and for increasing the amplification of said second color difference signal for second color difference signals greater than said first predetermined amplitude; and a third non-linear amplifier connected to said third color difference signal, said third non-linear amplifier adapted to amplify said third color difference signal at a first amplification for third color difference signals less than a first predetermined amplitude and for increasing the amplification of said third color difference signals for third color difference signals greater than said first predetermined amplitude.
Claim 3
Dependent Claim
34 words
The invention according to claim 1 wherein said first, second and third non-linear amplifiers amplify their respective color difference signals at a decreased amplification for respective color difference signals above a second predetermined amplitude.
Claim 4
Dependent Claim
54 words
The invention according to claim 1 further comprising first, second, and third linear amplifiers adapted to be connected in parallel with the respective first, second and third non-linear amplifiers and means connected to the outputs of said linear and non-linear amplifiers for controlling the amplification of said first, second and third color difference signals.
Claim 5
Dependent Claim
40 words
The invention according to claim 1 wherein said first, second and third non-linear amplifiers include respective means for varying the amplification of said respective first, second and third color difference signals for color difference signals above said first predetermined amplitude.
Claim 6
Dependent Claim
106 words
A color television receiver adapted to receive a composite video signal including a chrominance signal and a luminance signal for displaying a color image on a display device comprising means for providing a chrominance signal, means for amplifying said chrominance signal including means for increasing the amplification of said chrominance signal for at least a portion of said chrominance signal having amplitudes above a first predetermined amplitude and means for decreasing the amplification of said chrominance signal for at least a portion of said chrominance signal having amplitudes above a second predetermined amplitude for controlling the saturation of the color image displayed on said display device.
Claim 7
Dependent Claim
106 words
A color television receiver adapted to receive a composite video signal including a chrominance signal and a luminance signal for displaying a color image on a display device comprising means for providing a chrominance signal, means for amplifying said chrominance signal including means for increasing the amplification of said chrominance signal for at least a portion of said chrominance signal having amplitudes above a first predetermined amplitude and means for decreasing the amplification of said chrominance signal for at least a portion of said chrominance signal having amplitudes above a second predetermined amplitude for controlling the saturation of the color image displayed on said display device.
Claim 8
Dependent Claim
119 words
A color television receiver adapted to receive a composite video signal including a chrominance signal and a luminance signal for displaying a color image on a display device comprising means for providing a chrominance signal, means for amplifying said chrominance signal including means for varying the gain of said amplifying means such that the gain of said amplifying means is maintained at a first predetermined value for that portion of said chrominance signal below a firSt predetermined amplitude and such that the gain of said amplifying means is increased for that portion of said chrominance signal between said first predetermined amplitude and a second predetermined amplitude for controlling the saturation of the color image displayed on said display device.
Claim 9
Dependent Claim
119 words
A color television receiver adapted to receive a composite video signal including a chrominance signal and a luminance signal for displaying a color image on a display device comprising means for providing a chrominance signal, means for amplifying said chrominance signal including means for varying the gain of said amplifying means such that the gain of said amplifying means is maintained at a first predetermined value for that portion of said chrominance signal below a firSt predetermined amplitude and such that the gain of said amplifying means is increased for that portion of said chrominance signal between said first predetermined amplitude and a second predetermined amplitude for controlling the saturation of the color image displayed on said display device.
Claim 10
Dependent Claim
36 words
The invention according to claim 6 wherein said means for varying the gain of said amplifying means decreases the gain of said amplifying means for that portion of said chrominance signal above said second predetermined amplitude.
Claim 11
Dependent Claim
26 words
The invention according to claim 6 further comprising means for selectively varying the gain for that portion of said chrominance signal above said first predetermined amplitude.
Claim 12
Dependent Claim
147 words
In a color television receiver adapted to receive a composite video signal including a chrominance signal and a luminance signal for displaying a color image on a display device, an automatic color image saturation control system comprising means for separating said composite video signal into said chrominance signal and said luminance signal, means for demodulating said chrominance signal to provide a first color difference signal, a second color difference signal, a third color difference signal, means for amplifying said color difference signals including means for individually varying the gain of said amplifying means independently of the phase of said chrominance signal such that said color difference signals up to a first predetermined amplitude are amplified with a first predetermined gain and such that said color difference signals above said first predetermined amplitude are amplified at a second gain said second gain being greater than said first gain.
Claim 13
Dependent Claim
147 words
In a color television receiver adapted to receive a composite video signal including a chrominance signal and a luminance signal for displaying a color image on a display device, an automatic color image saturation control system comprising means for separating said composite video signal into said chrominance signal and said luminance signal, means for demodulating said chrominance signal to provide a first color difference signal, a second color difference signal, a third color difference signal, means for amplifying said color difference signals including means for individually varying the gain of said amplifying means independently of the phase of said chrominance signal such that said color difference signals up to a first predetermined amplitude are amplified with a first predetermined gain and such that said color difference signals above said first predetermined amplitude are amplified at a second gain said second gain being greater than said first gain.
Claim 14
Dependent Claim
32 words
The invention according to claim 9 wherein said means for varying the gain of said amplifying means includes at least one saturation processor disposed between said amplifying means and said demodulating means.
Claim 15
Dependent Claim
46 words
The invention according to claim 10 wherein said saturation processor includes a first saturation processor, a second saturation processor and a third saturation processor connected, respectively, to said first, second and third color difference signals for varying the color difference signals coupled to said amplifying means.
Claim 16
Dependent Claim
127 words
In a color television receiver adapted to receive a composite video signal including a chrominance signal and a luminance signal for displaying a color image on a display device, an automatic color image saturation control system comprising means for separating said composite video signal into said chrominance signal and said luminance signal, means responsive to said chrominance signal for controlling the amplitude of said chrominance signal independently of the phase of said chrominance signal including means adapted to amplify said chrominance signal at a first amplification for chrominance signals less than a first predetermined amplitude and for amplifying said chrominance signals at a second amplification for chrominance signals greater than said first predetermined amplitude for controlling the saturation of the color image displayed on said display device.
Claim 17
Dependent Claim
127 words
In a color television receiver adapted to receive a composite video signal including a chrominance signal and a luminance signal for displaying a color image on a display device, an automatic color image saturation control system comprising means for separating said composite video signal into said chrominance signal and said luminance signal, means responsive to said chrominance signal for controlling the amplitude of said chrominance signal independently of the phase of said chrominance signal including means adapted to amplify said chrominance signal at a first amplification for chrominance signals less than a first predetermined amplitude and for amplifying said chrominance signals at a second amplification for chrominance signals greater than said first predetermined amplitude for controlling the saturation of the color image displayed on said display device.
Claim 18
Dependent Claim
34 words
The invention according to claim 12 wherein said automatic saturation control system further includes means for amplifying said chrominance signal at a third amplification for chrominance signals having amplitudes above a second predetermined amplitude.
References Cited (Backward Citations)
US2888514A
Cited
US3647941A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |