Synchronism detecting circuit utilizing pulse width

Details Synchronism detecting circuit utilizing pulse width Synchronism detecting circuit utilizing pulse width

1991-10-08

1992-12-29

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358155, H04N 510

Patent

active

051756200

ABSTRACT:
A synchronizing detecting circuit removing video and audio noises by discriminating the non-broadcasting channels from the broadcasting channels. The synchronizing detecting circuit has a first inspector for recognizing signals based on the number of pulses of the gated pulse rows supplied from a gate device during the synchronized pulse period of the received synchronizing signal, a second inspector for recognizing the synchronizing signal by inspecting the number of pulses of the gated pulse rows from the gate device during the period of the synchronized width of the synchronizing signal supplied in accordance with the output of the first inspector, and an output stabilizer for outputting synchronism detecting signals of a stabilized logic state by stabilizing the outputs of the second inspector.

REFERENCES:
patent: 4459612 (1984-07-01), Shinkai et al.
patent: 4736162 (1988-04-01), Ishihara
patent: 4891705 (1990-01-01), Suzuki et al.
patent: 5025496 (1991-06-01), Canfield

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