Synchronous separation circuit

Details Synchronous separation circuit Synchronous separation circuit

1984-11-02

1987-01-06

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 508

Patent

active

046351159

ABSTRACT:
A synchronous separation circuit comprises a capacitor, one end of the capacitor serving as an input terminal for receiving a synthetic video signal, a first C-MOS inverter, an input terminal of which is connected to the other end of the capacitor, a first resistor, one end of which is connected to the other end of the capacitor, a diode, one end of which is connected to the other end of the capacitor, and a second C-MOS inverter, an input terminal of which is connected to the other end of the diode, while an output terminal of which is connected directly or through a second resistor to the input terminal of the second C-MOS inverter, wherein when the synthetic video signal has positive characteristics, a potential at the other end of the first resistor is set to a value equal to or lower than a potential at the input terminal of the second C-MOS inverter, and when the synthetic video signal has negative characteristics, the potential at the other end of the first resistor is set to a value equal to or higher than the potential at the input terminal of the second C-MOS inverter, so as to provide a direct current bias voltage.

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