Automatic hue control system

Details Automatic hue control system Automatic hue control system

1975-11-06

1977-09-13

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 9535

Patent

active

040486524

ABSTRACT:
An automatic hue control system operates to correct the phase of the color subcarrier reference signal used to operate the demodulators of a color television receiver. A regenerated color subcarrier signal at the phase of the I axis or the axis of flesh color is fed to one input of a phase comparator. The amplitude limited chrominance signal is fed to another input of the phase comparator, the output of which is used to operate a single pole double throw switch circuit. The switch passes the regenerated subcarrier signal to the demodulators when the phase difference between the limited chrominance and the regenerated subcarrier signals is outside a predetermined angle on each side of the I or flesh axis. Whenever the phase relationship between the limited chrominance signal and the subcarrier reference signal places the two signals within the predetermined angle on each side of the I or flesh axis, the switch circuit passes the limited chrominance signal to the demodulators as the color subcarrier reference signal.

REFERENCES:
patent: 3647941 (1972-03-01), Anorade
patent: 3688021 (1972-08-01), Ekstrand
patent: 3715471 (1973-02-01), Nakabe et al.
patent: 3740459 (1973-06-01), Okada
patent: 3743764 (1973-07-01), Wittmann

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