回波消除器

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文档信息

【标题】回波消除器

【发明人】 Sato  Akira  Tamura  Junzo  Kitayama  Seishi 

【公开日期】1978-11-21

【分类号】H04B 320

【摘要】An echo canceller in a telephone circuit for minimizing a residual echo obtained by subtracting a pseudo-echo reproduced from an impulse response of an echo path from a true echo, in which the inpulse response is corrected by the use of the product of the residual echo and received input. A variable coefficient circuit is provided between a multiplier for obtaining the product and a circuit for correcting the impulse response. A control circuit is provided for reducing the coefficient of the variable coefficient circuit in accordance with the lapse of time of the duration of the received input exceeding a predetermined threshold level after receiving a circuit connection completion signal of the telephone circuit.

【申请号】8804788

【优先权】JPX 50-133746 19751107

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