Dual polarity sync processor

Details Dual polarity sync processor Dual polarity sync processor

1982-02-22

1984-06-05

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358153, 358154, H04N 506

Patent

active

044531834

ABSTRACT:
A synchronizing pulse processor accepts integrated and differentiated composite sync signal inputs of either positive or negative polarity. Processed horizontal and vertical sync pulses are produced which have a single predetermined polarity independent of the polarity of the composite sync signal. The polarity of the differentiated composite sync signal is used to select the reference level for the vertical sync pulse threshold detector. The sync processor may be formed as a part of an integrated circuit and require only two input interface terminals regardless of composite sync signal polarity.

REFERENCES:
patent: 3527887 (1970-09-01), Glapp
patent: 4097896 (1978-06-01), Avery
patent: 4185299 (1980-01-01), Harford
patent: 4237487 (1980-12-01), Ikeda et al.
patent: 4266245 (1981-05-01), Balaban

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