Demodulation circuit for a digitized chrominance signal

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

H - Electricity

04

N

350/72

H04N 9/12 (2006.01) H04N 11/16 (2006.01)

Patent

CA 1223061

13 ABSTRACT: In a digital demodulation circuit for a chromi- nance signal of a colour television signal comprising 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 sig- nal 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 sampl- ing 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 said addition in the phase control loop of the first oscillator, variations in the horizon- tal deflection frequency cannot lead to the undesired phenomenon of the first digital oscillator being pulled to a side-band frequency of the colour subcarrier wave.

443370

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