Speaker phones

Details Speaker phones Speaker phones

1980-03-17

1982-08-24

Popek, Joseph A.

179 81B, H04M 908

Patent

active

043462618

ABSTRACT:
A speaker telephone system having hands-free telephone sets with microphones and loud-speakers and including circuitry for preventing feedback between the loud-speakers and the microphones in both the transmitting and receiving modes by automatically controlling the amplification of the signals coming from the microphones and going to the loud-speakers, as a function of the signal direction, while still maintaining the microphones and loud-speakers electrically coupled to the telephone lines.

REFERENCES:
patent: 3751602 (1973-08-01), Breeden
patent: 4115658 (1978-09-01), Williams

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