Title:
音声通信ネットワークにおける残留遠端エコーを低減するための方法と装置
Document Type and Number:
Japanese Patent JPH09512980
Kind Code:
A
Abstract:
A method and apparatus are described for reducing, in communication signals received by a local network from a remote network (FAR-IN signals), that energy content that is attributable to echoes of signals transmitted into the local network (NEAR-IN signals). This is achieved, in part, by generating a time-varying TEMPLATE signal which represents the smoothed energy content of NEAR-IN signals delayed according to the echo path and attenuated by an estimated echo transmission loss. A non-linear processor passes the FAR-IN signal substantially without attenuation if it exceeds the threshold derived at least in part from the TEMPLATE, but attenuates the FAR-IN signal if it lies within a defined range below the threshold.
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Inventors:
ヴェラード，パトリック マイケル，ジュニヤ
ワイン，ウッドソン デール
ワイン，ウッドソン デール
Application Number:
JP52683696A
Publication Date:
December 22, 1997
Filing Date:
January 11, 1996
Export Citation:
Assignee:
エイ・ティ・アンド・ティ・コーポレーション
International Classes:
H04B3/21; H04B3/23; H04B3/32; H04M3/00; (IPC1-7): H04B3/23; H04B3/32; H04M3/00
Attorney, Agent or Firm:
岡部 正夫 （外１１名）