Television – Receiver circuitry – Automatic frequency control
Patent
1996-10-04
1997-10-14
Hsia, Sherrie
Television
Receiver circuitry
Automatic frequency control
348536, 348540, H04N 550
Patent
active
056777434
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
patent: 5181116 (1993-01-01), Nakagaki
Nishino Ko
Terao Chojiro
Hsia Sherrie
Mitsubishi Denki & Kabushiki Kaisha
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