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1. 发明授权

US4652703A Digital voice transmission having improved echo suppression 失效
标题翻译：数字语音传输具有改善的回声抑制
公开(公告)号：US4652703A
公开(公告)日：1987-03-24
申请号：US471137
申请日：1983-03-01
申请人： Chun C. Lu , William J. Miller , Jack E. Stephenson , Jay P. Jayapalan
发明人： Chun C. Lu , William J. Miller , Jack E. Stephenson , Jay P. Jayapalan
IPC分类号： H04B3/20
CPC分类号： H04B3/20
摘要： A digital voice communication apparatus having improved echo suppression includes a transmission gain detection circuit for detecting a near talker signal and a receiver gain detection circuit for detecting a far talker signal. An echo detecting circuit detects which of the near talker and far talker signals has a lesser value and suppresses the gain of the one detected to have the lesser value. A far talker suppressing circuit detects whether the most recent peak gain in this near talker signal is greater than a threshold and is greater than the gain of the far talker signal. If this condition exists the far talker signal is suppressed. A near talker signal suppressing circuit detects whether the most recent gain of the far talker signal is greater than a threshold and is greater than the gain of the near talker signal. If so, the gain of the near talker signal is suppressed.
摘要翻译：具有改善的回波抑制的数字语音通信装置包括用于检测近距离讲话者信号的发送增益检测电路和用于检测远扬声器信号的接收机增益检测电路。回波检测电路检测近旁话者和远谈话者信号中的哪一个具有较小的值，并且抑制检测到的那些增益具有较小的值。远扬声器抑制电路检测该近距离讲话者信号中最近的峰值增益是否大于阈值，并且大于远扬声器信号的增益。如果这种情况存在，则说话人信号被抑制。近距离讲话者信号抑制电路检测远扬声器信号的最近的增益是否大于阈值，并且大于近旁话者信号的增益。如果是这样，则抑制近旁话者信号的增益。

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