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US07809129B2 Acoustic echo cancellation based on noise environment 有权
基于噪声环境的声学回声消除

  • Patent Title: Acoustic echo cancellation based on noise environment
  • Patent Title (中): 基于噪声环境的声学回声消除
  • Application No.: US11848376
    Application Date: 2007-08-31
  • Publication No.: US07809129B2
    Publication Date: 2010-10-05
  • Inventor: Jincheng Wu , Joel Clark
  • Applicant: Jincheng Wu , Joel Clark
  • Applicant Address: US IL Schaumburg
  • Assignee: Motorola, Inc.
  • Current Assignee: Motorola, Inc.
  • Current Assignee Address: US IL Schaumburg
  • Main IPC: H04M9/08
  • IPC: H04M9/08
Acoustic echo cancellation based on noise environment
Abstract:
A method (200) of cancelling echo in a duplex communication device (100). The method can include detecting a level of noise present on an uplink signal path (104), generating a noise classifier (194) based on the detected level of noise, detecting whether uplink audio is present on the uplink signal path (104) and detecting whether downlink audio is present on a downlink signal path (102). The method further can include generating a double talk flag (136) based at least on the noise classifier, whether uplink audio is present on the uplink signal path, and whether downlink audio is present on the downlink signal path. In addition, the double talk flag, the noise classifier and an uplink signal can be processed to generate an output signal (120) having reduced echo.
Abstract(Chinese):

一种在双工通信设备（100）中消除回波的方法（200）。 该方法可以包括检测存在于上行链路信号路径（104）上的噪声电平，基于检测到的噪声电平产生噪声分类器（194），检测上行链路信号路径（104）上是否存在上行链路音频并检测 下行链路信号路径（102）是否存在下行链路音频。 该方法还可以包括至少基于噪声分类器生成双向通话标志（136），上行链路信号路径上是否存在上行链路音频，以及下行链路信号路径中是否存在下行链路音频。 此外，可以处理双向通话标记，噪声分类器和上行链路信号以产生具有减小的回波的输出信号（120）。

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