Circuit for suppressing white noise in received voice

Details Circuit for suppressing white noise in received voice Circuit for suppressing white noise in received voice

H - Electricity

04

M

H04M 1/60 (2006.01) H03G 5/18 (2006.01) H04B 1/10 (2006.01) H04M 1/74 (2006.01)

Patent

CA 2059411

A white noise suppressing circuit for suppressing white noise contained in a received voice of a speaker telephone apparatus includes a filter for suppressing white noise contained in an aural input signal input to an aural signal line, a switch for short-circuiting the filter, a detecting circuit for detecting the aural input signal, and a comparator for comparing an output of the detecting circuit with a preset voltage and for controlling the switch on the basis of the results of the comparison. When it is determined by the comparator that there is a voice input, the switch is short-circuited to make the filter inoperable. When there is no voice input, the switch is opened so as to make the filter operate.

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