Transistor circuit

Details Transistor circuit Transistor circuit

1982-01-13

1983-11-08

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

328139, H04N 508

Patent

active

044145691

ABSTRACT:
The present invention provides a transistor circuit suited for a synchronizing signal separator. More particularly, the transistor circuit can separate the noise-free synchronizing signal from a composite video signal.
The transistor circuit comprises a transistor having an emitter coupled to an input terminal through a capacitor and to a constant current source, a base applied with a bias voltage and a collector connected to an output terminal, a comparator comparing the emitter voltage with a reference voltage, and means for turning the transistor off in response to the comparator output. A current charging circuit is preferably added.

REFERENCES:
patent: 3629501 (1971-12-01), Cense
patent: 3858003 (1974-12-01), Scoubis
patent: 3879576 (1975-04-01), Okada
patent: 3903365 (1975-09-01), Arai
patent: 4027178 (1977-05-01), Larner
patent: 4185299 (1980-01-01), Harford
patent: 4289981 (1981-09-01), Sakamoto

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