Demodulation circuit for a digitized chrominance signal having a

Details Demodulation circuit for a digitized chrominance signal having a Demodulation circuit for a digitized chrominance signal having a

1983-12-12

1986-11-25

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 966

Patent

active

046252320

ABSTRACT:
In a digital demodulation circuit for a chrominance signal of a color television signal having a first digital oscillator (35) for producing reference signals and a phase control loop (29, 17, 19, 49, 43) therefor, there is added in the phase control loop a signal combination (at 56) which is obtained from a phase control loop (67, 63, 59) of a second digital oscillator (77). This second digital oscillator derives the sampling frequency for sampling the chrominance signal from a signal source (83) of a constant frequency and couples this sampling frequency to the horizontal deflection frequency. By the addition in the phase control loop of the first oscillator, variations in the horizontal deflection frequency cannot lead to the undesired phenomenon of the first digital oscillator being pulled to a side-band frequency of the color subcarrier wave.

REFERENCES:
patent: 4502074 (1985-02-01), Reitmeier
patent: 4514754 (1985-04-01), Nillesen et al.

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