Composite synchronizing signal separation circuit

Details Composite synchronizing signal separation circuit Composite synchronizing signal separation circuit

1993-03-03

1994-03-22

Groody, James J.

Television

Synchronization

Sync separation

348531, 348500, H04N 508, H04N 504

Patent

active

052969282

ABSTRACT:
A composite synchronizing signal separation circuit in which separation of the composite synchronizing signal by a digital circuit is realized and such trouble as adjusting the time constant is not needed and a phase shift is reduced: a horizontal interruption receiving circuit 1 which is reset by a timing pulse signal at the time point of 3/4 from the starting time point of one horizontal synchronizing period, and separates and outputs a horizontal synchronizing signal HD from a composite synchronizing signal SYNC; a schedule counter circuit 2 which is reset by the horizontal synchronizing signal HD and outputs count value while counting up to a predetermined value in one horizontal synchronizing period; a timing decoding circuit 3 which decodes the count value and respectively outputs timing pulse signals at the time points of 1/4, 1/2 and 3/4 from the starting time point of one horizontal synchronizing period; and a vertical interruption receiving circuit 4 which samples the composite synchronizing signal SYNC by these signals and outputs a vertical synchronizing signal VD.

REFERENCES:
patent: 4491870 (1985-01-01), Aschwanden
patent: 4683495 (1987-07-01), Brock
patent: 4954893 (1990-09-01), Urakami
patent: 4999708 (1991-03-01), Aoki et al.
patent: 5132794 (1992-07-01), Okada et al.
patent: 5189515 (1993-02-01), Chen
"Basic Image Signal Processing", CQ Publishing Co., Apr. 1, 1987.

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