Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1978-10-25
1980-08-05
Murray, Richard
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 27, H04N 9535
Patent
active
042164931
ABSTRACT:
A chrominance signal processing circuit in a color television receiver which comprises a bandpass amplifier, a burst gate pulse source, a subcarrier generator, a 90.degree. phase shifter for phase shifting the generated subcarrier, a B - Y demodulator and an R - Y demodulator both coupled to the bandpass amplifier and separately coupled to the subcarrier generator and the 90.degree. phase shifter, respectively, characterized in that a flip-flop is provided responsive to the burst gate pulse to alternately provide a first and second selected burst gate pulses, the B - Y and R - Y demodulators are structured to provide a burst magnitude representing signal and a subcarrier phase drift representing signal, respectively, in the line blanking period and to be disabled responsive to the first and second selected burst gate pulses, respectively, an automatic color control sample and hold circuit is provided to be enabled to the second burst gate pulse to hold the burst magnitude representing output of the B - Y demodulator to supply the held level signal to the bandpass amplifier as a gain control signal, and an automatic phase control sample and hold circuit is provided to be enabled responsive to the first selected burst gate pulse to hold the subcarrier phase drift representing output of the R - Y demodulator to supply the held level signal to the subcarrier generator as a frequency control signal. Preferably a color gain control and tint control are provided, which are structured to be responsive to the burst gate pulse to be disassociated with the bandpass amplifier and the subcarrier generator.
REFERENCES:
patent: 3673320 (1972-06-01), Carnt et al.
patent: 4101927 (1978-07-01), Isono et al.
Murray Richard
Sanyo Electric Co,. Ltd.
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