Handsfree communication apparatus

Details Handsfree communication apparatus Handsfree communication apparatus

1995-03-02

1996-08-13

Hofsass, Jeffery

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379387, 379395, 379419, 381 92, 381 94, H04M 100

Patent

active

055464580

ABSTRACT:
A handsfree communication apparatus utilizing a plurality of microphones to allow simultaneous communication by a plurality of persons. The plurality of microphones are separately provided apart from one another. An amplifier section (or a noise canceller) includes a plurality of operational amplifiers for signal amplification individually corresponding to the plurality of microphones, and differential amplifier circuit for executing a differential amplification. Through the differential amplification, simultaneously input noise components are canceled out and reduced, and at the same time speech components are extracted.

REFERENCES:
patent: 5379338 (1995-01-01), Umemoto et al.
patent: 5381473 (1995-01-01), Andrea et al.
patent: 5384843 (1995-01-01), Masuda et al.

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