Synchronizing signal detecting circuit

Details Synchronizing signal detecting circuit Synchronizing signal detecting circuit

1992-06-02

1994-10-18

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

348536, 348540, H04L 704, H04N 506, H03L 700

Patent

active

053575458

ABSTRACT:
When supplied with an external synchronizing signal from an input terminal (2), a synchronizing separating circuit (6) separates and detects a horizontal synchronizing signal from the input signal and generates an HD pulse. When supplied with the HD pulse, a flip-flop (9) is set to generate a pulse. This output pulse is integrated by an integrating circuit (8) and an integrated output from the integrating circuit (8) is used to adjust a width of an output pulse from the flip-flop (9) to a value corresponding to a horizontal scanning frequency. The flip-flop (9) can be set only when supplied with the HD pulse, thereby preventing the flip-flop (9) from outputting a pulse whose width is longer than the width of the HD pulse. Therefore, the length of the back porch can be prevented from being reduced more than it is needed.

REFERENCES:
patent: 4024571 (1977-05-01), Dischert et al.
patent: 4334243 (1982-06-01), Srivastava
patent: 4870297 (1989-09-01), Karlock

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