Synchronized signal separating circuit for a recording and repro

Details Synchronized signal separating circuit for a recording and repro Synchronized signal separating circuit for a recording and repro

1986-05-21

1987-09-01

McElheny, Jr., Donald

Facsimile and static presentation processing

Facsimile

Recording apparatus

358153, H04N 508, H04N 593

Patent

active

046912487

ABSTRACT:
A synchronizing signal separating circuit comprises an input terminal for receiving a composite color video signal to be recorded at the time of a recording, and for receiving a time-division-multiplexed signal at the time of a reproduction, a measuring circuit for measuring a time interval between a time when a horizontal synchronizing signal within an input signal received through the input terminal assumes a first predetermined value and a time when the horizontal synchronizing signal assumes a second predetermined value, a memory circuit having various correcting data pre-stored therein, for producing one correcting data in accordance with the time interval measured by the measuring circuit, and a signal generating circuit for generating the separated horizontal synchronizing signal at a time position in accordance with the one correcting data which is produced from the memory circuit. The various correcting data are pre-stored in the memory circuit for each of various time intervals required for the horizontal synchronizing signal to reach the second predetermined value from the first predetermined value, and contain data for constantly generating a separated horizontal synchronizing signal at a time position which is approximately constant in each of the various time intervals.

REFERENCES:
patent: 4335393 (1982-06-01), Pearson
patent: 4616270 (1986-10-01), Nishimoto
patent: 4626929 (1986-12-01), Ichinoi et al.
patent: 4628369 (1986-12-01), Ichinoi et al.
patent: 4641201 (1987-02-01), Ichinoi et al.

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