Loudspeaking telephone

Details Loudspeaking telephone Loudspeaking telephone

H - Electricity

04

M

379/81

H04M 1/60 (2006.01) H04M 9/08 (2006.01)

Patent

CA 1181541

ABSTRACT An apparatus and method of controlling the loop gain in a loudspeaking telephone comprising storing representations of an outgoing signal and an incoming signal in corresponding storage means with reduced representations of the incoming and outgoing signals respectively, in which the storage means have much faster attack times than decay times, comparing the representations, and controlling the gains of outgoing and incoming signal paths of the loop according to the degree and polarity of the result of the comparison. With the outgoing signal path connected to a microphone or a signal source and the incoming signal path connected to a loudspeaker, a hands-free communication can be carried on having much more natural characteristics than in the past, devoid of most of the "hollow" sound characteristic of prior art systems.

403582

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