Burst phase correcting circuit

Details Burst phase correcting circuit Burst phase correcting circuit

1993-01-12

1994-09-27

Groody, James J.

Television

Synchronization

Phase locking regenerated subcarrier to color burst

348536, H04N 9455

Patent

active

053510917

ABSTRACT:
A burst phase correcting circuit includes a first all-pass filter which receives a chrominance sign inputted from a terminal. A phase reference signal from an oscillator is applied to a first phase-comparator together with an output signal from the first all-pass filter, after the same is phase-shifted by 90 degrees by a first phase-shifter. A signal according to a phase difference of the both signals is outputted from the first phase-comparator and applied to the first all-pass filter via a first low-pass filter and a capacitor. Therefore, in the first all-pass filter, a delay time is varied in accordance with the phase difference between the chrominance signal and the phase reference signal. Therefore, a jitter component of the chrominance signal can be removed.

REFERENCES:
patent: 4150395 (1979-04-01), Pritchard
patent: 4170023 (1979-10-01), Yamakoshi et al.
patent: 4352121 (1982-09-01), Lilley
patent: 4403244 (1983-09-01), Fujishima
patent: 4631600 (1986-12-01), Fukui
patent: 4635097 (1987-01-01), Tatami
patent: 4647984 (1987-03-01), Suzuki et al.
patent: 4688081 (1987-08-01), Furuhata et al.
patent: 4797730 (1989-01-01), Smith

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