Method and apparatus for converting synchronizing signal

Details Method and apparatus for converting synchronizing signal Method and apparatus for converting synchronizing signal

1991-12-31

1993-12-28

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358150, H04N 5073

Patent

active

052744507

ABSTRACT:
In a converting method and apparatus therefor, synchronizing signal is received from an external synchronizing signal generator, which includes a circuit which generates two or more frequency signals, and alternately transmits these signals to the converting apparatus. The apparatus includes a decoder circuit for decoding an alternating rate of the frequency signals, outputted from the external synchronizing signal generator, and generating a new synchronizing pulse signal on the basis of the decoded signal. The new synchronizing pulse signal which has a level higher than the white level or lower than the black level of a composite video signal, generated by the TV camera, is injected into a video transmission line connected to the TV camera for synchronizing the latter on the basis of the injected synchronizing pulse.

REFERENCES:
patent: 3443024 (1969-05-01), Allen et al.
patent: 3525808 (1970-08-01), Brown
patent: 4603352 (1986-07-01), Kaneta et al.

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