Synchronizing signal selection circuit

Details Synchronizing signal selection circuit Synchronizing signal selection circuit

1991-08-08

1993-09-14

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358153, 358155, H04N 510, H04N 58

Patent

active

052454312

ABSTRACT:
In a synchronizing signal selection circuit, in response to the input of a vertical synchronizing signal extracted from a composite synchronizing signal, a control signal is generated. The control signal is in a predetermined state during a period which begins when a first predetermined time period has elapsed after the input of the vertical synchronizing signal, and which terminates when a second predetermined time period has elapsed after the input of the vertical synchronizing signal. The composite synchronizing signal is output when the control signal is in the predetermined state, and a horizontal synchronizing signal separated the composite synchronizing signal is output when the control signal is in a state other than the predetermined state.

REFERENCES:
patent: 4701796 (1987-10-01), Kamiya
patent: 4709268 (1987-11-01), Akimoto et al.
patent: 4772950 (1988-09-01), Furuhata et al.
patent: 4792857 (1988-12-01), Akiyama
patent: 4870297 (1989-09-01), Karlock
patent: 5132794 (1992-07-01), Okada et al.
Translation of Abstract of Japanese Appln. No. 1-298875.

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