Apparatus and method for synchronizing a horizontal deflection s

Details Apparatus and method for synchronizing a horizontal deflection s Apparatus and method for synchronizing a horizontal deflection s

1995-07-14

1997-04-15

Hsia, Sherrie

Television

Receiver circuitry

Automatic frequency control

348536, 348540, H04N 550

Patent

active

056214855

ABSTRACT:
In an automatic frequency control circuit for synchronizing a horizontal deflection current of a television receiver with a horizontal sync signal, a bi-level signal which assumes either of two levels when the flyback pulse is or below a threshold value is produced, and a wider sync signal in synchronism with the horizontal sync signal and having a pulse width wider than the horizontal sync signal and equal to an odd multiple of the operating clock period is also produced. A phase comparator detects the difference in the number clock periods between a period period from a leading edge of the wider sync signal to an edge of the bi-level signal, and a period from the edge of the bi-level signal to a trailing edge of the wider sync signal. The detected difference is used to control a VCO. In an alternative configuration, a digital signal indicative of a magnitude of the flyback pulse during its rising or falling slope at an edge of the horizontal sync signal is produced and used for control of the VCO.

REFERENCES:
patent: 3990107 (1976-11-01), Hanma

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