Telephone headset interface circuit

Details Telephone headset interface circuit Telephone headset interface circuit

1993-05-17

1997-04-22

Matar, Ahmad F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379395, 379387, H04M 900

Patent

active

056235445

ABSTRACT:
A telephone headset interface circuit is coupled to a telephone line to extract power for use by a headset amplifier and is particularly adapted for use with telephone handsets having dynamic or electret microphones. The telephone line connects a telephone to a service system, such as a Central Office, a PBX system, or a Key system. The interface circuit includes a power extraction circuit having a plurality of circuit portions, each one coupled to a corresponding one of the telephone line wires, so that substantially identical electrical impedance characteristics are introduced to each such wire. A ring suppress circuit, serially coupled between the power extraction circuit and the headset amplifier, senses the presence of a ringing voltage on the telephone line and decouples the power extraction circuit from the amplifier in response thereto.

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