Telephone headset interface circuit

Details Telephone headset interface circuit Telephone headset interface circuit

1987-05-05

1988-11-01

LaRoche, Eugene R.

Telephonic communications

Substation or terminal circuitry

Amplifying

379387, 379400, 379413, 379414, H04M 119, H04M 160

Patent

active

047825243

ABSTRACT:
An interface circuit interfaces a four wire telephone circuit to a telephone headset. An adjustable receiver portion of the interface circuit receives a line input signal from the four wire circuit and produces a headset input signal limited to a predetermined signal level. An adjustable output portion of the interface circuit accepts a headset output signal and conditions it for use as a line output signal on the four wire circuit. A DC voltage is also supplied to a headset microphone through the output portion of the interface circuit.

REFERENCES:
patent: 4536888 (1985-08-01), Wilson

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