Self-adjusting window circuit with timing control

Details Self-adjusting window circuit with timing control Self-adjusting window circuit with timing control

1993-11-09

1995-07-11

Groody, James J.

Television

Synchronization

Sync separation

348533, 348530, H04N 508, H04N 510

Patent

active

054325595

ABSTRACT:
A self-adjusting window circuit suitable for fabrication as a monolithic integrated circuit. The self-adjusting window circuit comprises an input port, a positive edge detector coupled to the input port, a latch coupled to the output of the edge detector and a charging stage coupled to the latch. The input signal comprises a signal having a sequence of pulses appearing at a predetermined scan rate, for example, a composite video signal. The input port feeds the input signal to the edge detector which produces a pulse output signal in response to detecting a pulse in the input signal. The pulse output from the edge detector is latched and used to generate a charging control signal which controls the charging stage. In response to the charging control signal, the charging stage produces a window control signal for a predetermined period. The circuit includes a feedback network which injects the window control signal into the positive edge detector so that the positive edge detector is disabled while the window control signal is active.

REFERENCES:
patent: 3492424 (1970-01-01), Hare
patent: 4237487 (1980-12-01), Ikeda et al.
patent: 4445092 (1984-04-01), Yoshinaka et al.
patent: 4694256 (1987-09-01), Kawamura
patent: 4722004 (1988-01-01), Miyamoto et al.
patent: 4792852 (1988-12-01), Narusawa

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