Hands-free circuitry providing audio signal adjustment based on

Details Hands-free circuitry providing audio signal adjustment based on Hands-free circuitry providing audio signal adjustment based on

1995-02-17

1996-07-09

Urban, Edward F.

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

455 89, 379388, 379390, H04B 138, H04M 908

Patent

active

055354335

ABSTRACT:
A hands-free circuitry in which, in order to prevent howling caused by acoustic coupling between a speaker and a microphone, a loss is inserted in a transmit audio path in a receive mode while a loss is inserted in a receive voice path in a transmit mode and values of the losses are controlled according to the volume set value of the speaker. Since the quantities of the losses are minimized when a howling margin is sufficient, simplex communication can be prevented that a user cannot listen to party's receive voice signal due to excessive attenuation.

REFERENCES:
patent: 4378603 (1983-03-01), Eastmond
patent: 4400584 (1983-08-01), Vilmur
patent: 4629829 (1984-12-01), Puhl et al.
patent: 4648110 (1987-03-01), Elsasser
patent: 4715063 (1987-12-01), Haddad et al.
patent: 4982425 (1991-01-01), Yoshida
patent: 5201068 (1993-04-01), Kawashima

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