Automatic phase control apparatus

Details Automatic phase control apparatus Automatic phase control apparatus

1994-09-13

1997-05-20

Metjahic, Safet

Television

Synchronization

348556, 348540, H04N 183

Patent

active

056317085

ABSTRACT:
An automatic phase control apparatus for controlling the frequency of a sine wave produced from a variable frequency oscillator to be equal to that of the carrier wave of the extracted chrominance signal. A phase difference detector 4 detects a phase difference between the sine wave and the carrier wave. The detected phase difference is integrated to obtain an integrated value which is applied to the frequency oscillator for determining the oscillation frequency. A deviation detector is provided for detecting a deviation of the integrated value with respect to an expected frequency control data calculated by a calculator. When the deviation is greater than a predetermined range, the integrated value is replaced with the calculated data.

REFERENCES:
patent: 4000476 (1976-12-01), Walker et al.
patent: 4769691 (1988-09-01), Dischert
patent: 4807048 (1989-02-01), Yasuda
EPO Search Report (94114338.0) dated Aug. 17, 1995.

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