Circuit arrangement for synchronizing a television receiver

Details Circuit arrangement for synchronizing a television receiver Circuit arrangement for synchronizing a television receiver

1974-10-09

1976-01-27

Morrison, Malcolm A.

Telegraphy

Systems

Line-clearing and circuit maintenance

178 75S, 331 20, H04L 700, H04N 504

Patent

active

039353885

ABSTRACT:
The invention provides a circuit for centrally generating the horizontal and vertical sweep frequencies in a TV receiver. A central oscillator provides a frequency which is divided to obtain the horizontal frequency. A periodic counter with adjustable final counting value divides the central oscillator frequency to establish a vertical sweep signal. Phase comparators and gate circuits are used to gate the oscillator signal to the periodic counter to synchronize the vertical sweep with the transmitted vertical sync signal.

REFERENCES:
patent: 2853550 (1958-09-01), Reid
patent: 2980858 (1961-04-01), Grundin et al.
patent: 3024417 (1962-03-01), Secretan
patent: 3336440 (1967-08-01), Blake et al.
patent: 3384821 (1968-05-01), Beck
patent: 3814855 (1974-06-01), Kokado

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