Phase locked loop system for providing a phase shifted output si

Details Phase locked loop system for providing a phase shifted output si Phase locked loop system for providing a phase shifted output si

1984-12-03

1987-01-13

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 25, H04N 945

Patent

active

046368361

ABSTRACT:
A phase locked loop system is described in the context of a digital television receiver. The system includes a band-pass filter which shifts the phase of burst samples provided to it by 33.degree.. This phase shift makes the zero-crossing points of the filtered burst signal coincident with the I color difference signal sampling phase relative to the unfiltered burst signal. The phase locked loop uses a zero-crossing phase detector to develop a control signal for a VCO. The oscillatory signal provided by the VCO has a frequency of, for example, four times the frequency of the burst, but shifted in phase relative to the burst to allow sampling composite video signal coincident with the phase of at least one of the I and Q color difference signals.

REFERENCES:
patent: 3806635 (1974-04-01), Abbott et al.
patent: 4291332 (1981-09-01), Kato et al.
patent: 4404583 (1983-09-01), Tatami
patent: 4527145 (1985-07-01), Haussmann et al.

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