Digital loudspeaking telephone

Details Digital loudspeaking telephone Digital loudspeaking telephone

H - Electricity

04

M

379/81

H04M 1/60 (2006.01) H04M 9/08 (2006.01) H04Q 1/453 (2006.01)

Patent

CA 1233925

ABSTRACT OF DISCLOSURE A digital loudspeaking telephone for connection to a telephone line, comprised of a microphone, speaker, codec and digital signal processor. Incoming and outgoing signals are received from remote and local subscribers respectively and in response, incoming and outgoing envelope and noise floor signal levels are generated and compared, and one of the incoming or outgoing signals is suppressed. Automatic gain control of outgoing signals is implemented in order to allow smooth switching of the outgoing signals and to suppress background noise from being transmitted by the microphone. The present invention also detects room echo and reverberation, and eliminates spurious channel switching due to echo signals in response thereto.

481289

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