US3673320A — Television apparatus responsive to a transmitted …

Claim 1

Independent Claim 205 words

In a color television receiver adapted to receive a television signal including a luminance component, a chrominance component modulated in both phase and amplitude, periodically recurring color synchronizing bursts occupying prescribed intervals during the horizontal retrace portions of said signal and a color reference signal occupying a prescribed interval during the vertical retrace portion of said signal, apparatus comprising: first means for providing an oscillatory signal to demodulate said chrominance component and produce color difference signals containing information proportional to the hue and saturation of the televised scene; second means responsive to said television signal for recovering the color synchronizing bursts thereof and for coupling said bursts to said first means to lock at least the frequency of the oscillatory signal provided thereby to the frequency of such bursts; and third means, also responsive to said television signal, for recovering said color reference signal and for utilizing said signal to develop a control signal for said first means to adjust the phase of said oscillatory signal as a function of the phase of said reference signal; whereby the degree of error in the hue of a reproduced color image attributable to such transmission characteristics as multipath, transmission line reflection and the like is correspondingly reduced.

Claim 2

Dependent Claim 205 words

In a color television receiver adapted to receive a television signal including a luminance component, a chrominance component modulated in both phase and amplitude, periodically recurring color synchronizing bursts occupying prescribed intervals during the horizontal retrace portions of said signal and a color reference signal occupying a prescribed interval during the vertical retrace portion of said signal, apparatus comprising: first means for providing an oscillatory signal to demodulate said chrominance component and produce color difference signals containing information proportional to the hue and saturation of the televised scene; second means responsive to said television signal for recovering the color synchronizing bursts thereof and for coupling said bursts to said first means to lock at least the frequency of the oscillatory signal provided thereby to the frequency of such bursts; and third means, also responsive to said television signal, for recovering said color reference signal and for utilizing said signal to develop a control signal for said first means to adjust the phase of said oscillatory signal as a function of the phase of said reference signal; whereby the degree of error in the hue of a reproduced color image attributable to such transmission characteristics as multipath, transmission line reflection and the like is correspondingly reduced.

Claim 3

Dependent Claim 81 words

The apparatus of claim 1 wherein there is additionally included fourth means for coupling the chrominance component of said television signal for demodulation with said oscillatory signal to produce said color difference signals, and wherein fifth means is also included to respond to corresponding coupling of said color reference signal via said fourth means to control the amplitude of said color difference signals and the saturation of the reproduced color image as a function of the amplitude of said reference signal.

Claim 4

Dependent Claim 58 words

The apparatus of claim 2 wherein sixth means is also included, coupled to said first, second and fourth means, respectively, and responsive to the presence of said provided oscillatory signal and to said recovered color synchronizing bursts to disable said fourth means during the monochrome transmission of a televised scene and in the absence of said synchronizing bursts.

Claim 5

Dependent Claim 63 words

The apparatus of claim 2 wherein said second means couples the recovered color synchronizing bursts to said first means to lock the frequency of said oscillatory signal to the frequency of said synchronizing bursts and wherein said third means couples said control signal to said first means to lock the phase of said oscillatory signal to the phase of said color reference signal.

Claim 6

Dependent Claim 73 words

The apparatus of claim 4 wherein said first means includes a reactance control device responsive to alternating current signals to regulate the frequency of said provided oscillatory signals and to direct current signals to regulate the phase of said oscillatory signals, wherein said second means alternating current couples the recovered color synchronizing burst to said reactance control device and wherein said third means direct current couples said control signal to said reactance device.

Claim 7

Dependent Claim 106 words

The apparatus of claim 5 for use in a color television receiver providing color difference signals along R-Y and B-Y demodulation axes and operative with a television signal including said color reference signal at -(R-Y) phase, wherein said third means includes means for monitoring the amplitude of the color difference signals provided along said B-Y demodulation axis and to develop said control signal for said first means to adjust the phase of said oscillatory signal to reduce the amplitude of said B-Y color difference signal in a direction to automatically compensate for transmission characteristic changes as would adversely affect the hue of the reproduced color image.

Claim 8

Dependent Claim 106 words

The apparatus of claim 5 for use in a color television receiver providing color difference signals along B-Y and R-Y demodulation axes and operative with a television signal including said color reference signal at -(B-Y) phase, wherein said third means includes means for monitoring the amplitude of the color difference signals provided along said R-Y demodulation axis and to develop said control signal for said first means to adjust the phase of said oscillatory signal to reduce the amplitude of said R-Y color difference signal in a direction to automatically compensate for transmission characteristic changes as would adversely affect the hue of the reproduced color image.

Claim 9

Dependent Claim 72 words

The apparatus of claim 6 wherein said fifth means includes means for monitoring the amplitude of the color difference signal provided along said R-Y demodulation axis and to develop said control signal for said fourth means to adjust the gain thereof to reduce the amplitude of said R-Y color difference signal in a direction to automatically compensate for transmission characteristic changes as would adversely affect the saturation of the reproduced color image.

Claim 10

Dependent Claim 72 words

The apparatus of claim 6 wherein said fifth means includes means for monitoring the amplitude of the color difference signal provided along said B-Y demodulation axis and to develop said control signal for said fourth means to adjust the gain thereof to reduce the amplitude of said B-Y color difference signal in a direction to automatically compensate for transmission characteristic changes as would adversely affect the saturation of the reproduced color image.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1975-06-27	1975-12-27	1976-06-27	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1979-06-27	1979-12-27	1980-06-27	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1983-06-27	1983-12-27	1984-06-27	$7700.00	Window Closed / Lapsed

Television apparatus responsive to a transmitted color reference signal

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