发明名称 |
CIRCUIT FOR SUPPRESSING WHITE NOISE IN RECEIVED VOICE |
摘要 |
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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申请公布号 |
CA2059411(C) |
申请公布日期 |
1996.03.26 |
申请号 |
CA19922059411 |
申请日期 |
1992.01.17 |
申请人 |
NEC CORPORATION |
发明人 |
EHARA, TATSUJI;KOMODA, MOTOYOSHI;MATSUSHITA, AKIMASA |
分类号 |
H03G5/18;H04B1/10;H04M1/60;(IPC1-7):H04M1/60;H04M1/74 |
主分类号 |
H03G5/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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