Chroma phase modulator

Details Chroma phase modulator Chroma phase modulator

1992-05-28

1993-05-11

Peng, John K.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358324, 358 28, H04N 989, H04N 964

Patent

active

052106195

ABSTRACT:
An A/D converter converts a composite video signal to a digital signal. A bandpass filter extracts a chroma signal-A sinX from the composite video signal in digital form. A delay circuit delays the chroma signal-A sinX by 1/4 fsc to output-A cosX. Delay circuits delay the chroma signal-A sinX by 1/2 fsc to output A sinX. A ROM stores values of -(1 - cos.theta.) and sin.theta.. Values of -(1 - cos.theta.) and sin.theta. are read from the ROM in accordance with a phase modulation amount .theta. of a voltage controlled oscillator. A multiplier multiplies a value of sin.theta. read from the ROM and A cosX output from the delay circuit. A multiplier multiplies a value of -(1 - cos.theta.) read from the ROM and A sinX output from the delay circuit. An adder adds outputs of the multipliers. Delay circuits delays the composite video signal output from the A/D converter. An adder adds an output of the adder and the composite video signal output from the delay circuit.

REFERENCES:
patent: 4123774 (1978-10-01), Hjortzberg
patent: 4266241 (1981-05-01), Hjortzberg
patent: 4292648 (1981-09-01), Koval
patent: 4814859 (1989-03-01), Kimura et al.
patent: 4860091 (1989-08-01), Kimura et al.

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