Apparatus for controlling the sound generation in the loudspeake

Details Apparatus for controlling the sound generation in the loudspeake Apparatus for controlling the sound generation in the loudspeake

1977-06-02

1978-10-31

Brown, Thomas W.

179 1H, H04M 910

Patent

active

041236203

ABSTRACT:
An apparatus for controlling the generation of sound in the loudspeakers of intercommunicating telephone sets in response to pulse-code modulated speech signals from the microphones of the telephone sets. A digital comparator compares speech signals received from each microphone and delivers a binary control signal to a dividing circuit through which the speech signal having the highest maximum value passes. The dividing circuit responds to the control signal by dividing the speech signal by a desired factor. A loudspeaker, contained in the same telephone set as the microphone from which the speech signal having the highest maximum value emanated, is in circuit with a control unit. The same binary control signal causes the control unit to suppress the generation of sound in the loudspeaker.

REFERENCES:
patent: 3849603 (1974-11-01), Proios
patent: 3958084 (1976-05-01), Nicholas
patent: 4024345 (1976-01-01), Kochem
A. Assimus, et al., "Digital Conference Network etc." IBM Tech. Discl. Bull., pp. 2967-2969, Mar. 1975.

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