Electronic telephone terminal having noise suppression function

Details Electronic telephone terminal having noise suppression function Electronic telephone terminal having noise suppression function

H - Electricity

04

M

379/73

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

Patent

CA 1291837

ELECTRONIC TELEPHONE TERMINAL HAVING NOISE SUPPRESSION FUNCTION ABSTRACT OF THE DISCLOSURE An electronic telephone terminal having a trans- mitter and a receiver, both having an approximately linear acoustic-to-electric transduction characteristics, and having a surrounding noise suppression function, and including a variable attenuator for controlling a gain of a transmission system; a noise detection device for detecting surrounding noise; and a control device for controlling the variable attenuator in such a manner that when a sound pressure level input to the transmitter exceeds a predetermined threshold value, the gain is fixedly set to a constant value, and when the input sound pressure level is equal to or below the predetermined threshold level, the gain is controlled in response to a change in the surrounding noise level detected by the noise detection device.

571870

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