Automatic gain control in a loudspeaker telephone set

Details Automatic gain control in a loudspeaker telephone set Automatic gain control in a loudspeaker telephone set

1986-02-28

1988-08-16

Ng, Jin F.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379388, H04M 908

Patent

active

047649542

ABSTRACT:
A loud-speaker telephone set includes a switching control circuit to attenuate the incoming signal, during transmission, and to attenuate the outgoing signal, during reception, in order to prevent feedback from the loud-speaker to the microphone. An automatic gain control circuit is added which detects at least one of the incoming signal level and the outgoing signal level and which adjusts the attenuation of both the incoming and outgoing signals so as to reduce the attenuation change between reception and transmission below 20 dB and eliminate the unpleasant sensation, to a user, of large attenuation changes.

REFERENCES:
patent: 3461240 (1969-08-01), Lindgren
patent: 3952166 (1976-04-01), Kato et al.
patent: 4002854 (1977-01-01), Penrose
patent: 4161624 (1979-07-01), Brosow
patent: 4317959 (1982-03-01), Kuriki
patent: 4513177 (1985-04-01), Nishino et al.
patent: 4527014 (1985-07-01), Styrna

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