Voice communication link interface apparatus

Details Voice communication link interface apparatus Voice communication link interface apparatus

1987-12-30

1989-11-07

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

379395, 379387, H04M 160

Patent

active

048797464

ABSTRACT:
Apparatus is provided for interfacing a voice communication instrument, e.g. headset, to a communication link, e.g. a telephone line. The interface includes a transmit channel having amplification, frequency shaping and voice switching to suppress background noise. The interface includes a receive channel having compression limiting as a function of the received signal amplitude and frequency. The interface further includes a power-down circuit and a low battery indicator.

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patent: 4457014 (1984-06-01), Bloy
patent: 4536888 (1985-08-01), Wilson
patent: 4641339 (1987-02-01), Stottlemeyer
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patent: 4712231 (1987-12-01), Julstrom
patent: 4718099 (1988-01-01), Hotvet
Marosi, Acoustic Protector Damps Telephone-Line Transients, Electronics (Feb., 1979), pp. 115-117.

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