Hue adjusting circuits

Details Hue adjusting circuits Hue adjusting circuits

1977-02-17

1978-10-03

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 25, H04N 950, H04N 9535

Patent

active

041187415

ABSTRACT:
In a circuit for processing a chroma signal the chroma signal is applied to a demodulator through a first phase shifter. The burst signal is applied to an automatic phase adjusting circuit including a phase detection circuit and a voltage-controlled oscillator. The output of the phase adjusting circuit is applied to a hue adjusting circuit including a second phase shifter and a mixing circuit connected to receive the output of the phase adjusting circuit and the output of the second phase shifter. A control voltage is applied to the mixing circuit for controlling the relative amplitude of the two inputs applied to the mixing circuit. The output of the hue adjusting circuit is applied to the demodulator to act as the subcarrier signal for demodulating the chroma signal. The first and second phase shifters are each comprised of a resistor and a capacitor and formed on the same integrated circuit semiconductor substrate.

REFERENCES:
patent: 2964588 (1960-12-01), Rhodes
patent: 3133987 (1964-05-01), Palladino
patent: 3527964 (1970-09-01), Hansen et al.
patent: 3575549 (1971-04-01), Hepner et al.
patent: 3781701 (1973-12-01), Cecchin et al.
patent: 3876934 (1975-04-01), Okada et al.

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