Horizontal synchronizing signal generating circuit

Details Horizontal synchronizing signal generating circuit Horizontal synchronizing signal generating circuit

1995-04-04

1996-07-23

Wambach, Margaret Rose

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327151, 327154, 327155, 327160, 348524, 348531, 348541, H03L 706

Patent

active

055393438

ABSTRACT:
There is disclosed a horizontal synchronizing signal generating circuit for generating a horizontal synchronizing signal which has no frequency variations and which is in phase with an entered composite synchronizing signal if the entered composite synchronizing signal is a nonstandard signal having a varying horizontal frequency. A horizontal counter circuit (5) counts a reference clock (V.sub.CL), and a window pulse generating circuit (4) outputs a window pulse signal (V.sub.W) which is low for a fixed time period when a counter output (V.sub.CT) equals a counter value (878) indicative of a standard output timing. A horizontal synchronizing signal separating circuit (1) outputs a horizontal synchronizing signal (V.sub.2) only when the composite synchronizing signal (V.sub.1) falls within the fixed time period. Then a horizontal phase judging circuit (2) outputs a standard signal flag (V.sub.3) and a synchronizing signal generating circuit (3) outputs the horizontal synchronizing signal (V.sub.2) in synchronism with the reference clock (V.sub.CL). When the composite synchronizing signal (V.sub.1) does not fall within the fixed time period, the horizontal phase judging circuit (2) outputs a nonstandard signal flag (V.sub.3), and the synchronizing signal generating circuit (3) outputs a horizontal synchronizing signal (V.sub.4) produced from the window pulse signal (V.sub.W).

REFERENCES:
patent: 4169659 (1979-10-01), Marlowe
patent: 4672447 (1987-06-01), Moring et al.
patent: 4675734 (1987-06-01), Widom
patent: 4722007 (1988-01-01), Fling
patent: 4876589 (1989-10-01), Orsburn et al.
patent: 5162910 (1992-11-01), Willis
patent: 5272532 (1993-12-01), Akiba
patent: 5404172 (1995-04-01), Berman et al.
"Transistor Gijyutsu special No. 5" pp. 92-93 Sep. 10, 1987.

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