Automatic phase control method and apparatus employing a region

Details Automatic phase control method and apparatus employing a region Automatic phase control method and apparatus employing a region

1995-11-08

1998-03-03

Tran, Thai

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

386 11, 386 13, H04N 970

Patent

active

057244715

ABSTRACT:
An automatic phase control method and automatic phase controller suitable for the method are disclosed, which can effectively cope with a phase error which is outside a proper operation region of a phase comparator, in which the phase comparator detects a phase difference between a reproduced color signal and a reference color signal. The automatic phase controller includes a region determiner for determining whether the phase difference between the burst signal and the reference color signal is in a positive or negative characteristic region for the phase comparator, and a phase inverter located between the reference color signal generator and the phase comparator, for providing the reference color signal generated from the reference color signal generator to the phase comparator if it is determined by the region determiner that the phase difference between the burst signal and the reference color signal is in the positive characteristic region of the phase comparator. The region determiner also inverts the phase of the reference color signal generated from the reference color signal generator and provides the phase-inverted result to the phase comparator if it is determined that the phase difference is in the negative characteristic region of the phase comparator. Therefore, a rapid and stable phase control operation can be performed by the automatic phase controller.

REFERENCES:
patent: 3624274 (1971-11-01), Araki
patent: 4209800 (1980-06-01), Yamamitsu et al.
patent: 4337477 (1982-06-01), Sagisshima et al.

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