Digital control of a loudspeaking telephone system

Details Digital control of a loudspeaking telephone system Digital control of a loudspeaking telephone system

1974-12-12

1976-04-27

Brown, Thomas W.

179 81B, H04M 908

Patent

active

039536769

ABSTRACT:
Two digitally controllable attenuator networks are provided in the receiver and transmit channels of a loudspeaking telephone system. The analog control signal usually utilized to control the total loop gain in such systems is converted to a digital representation and its complementary representation, one of which is then applied to control the transmit attenuator and the other to control the receive attenuator. Stable, thump-free control of the loop gain is thus achieved.

REFERENCES:
patent: 3136864 (1964-06-01), Cleary
patent: 3330912 (1967-07-01), Koseki
patent: 3660603 (1972-05-01), Andersen
patent: 3725585 (1973-04-01), Moniak et al.
patent: 3794763 (1974-02-01), Boudewijns et al.
patent: 3832491 (1974-08-01), Sciulli et al.
patent: 3860756 (1975-01-01), Shinoi et al.
patent: 3894187 (1975-07-01), Shibata et al.

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