公开(公告)号：US06377679B1

公开(公告)日：2002-04-23

申请号：US08993412

申请日：1997-12-18

申请人： Hiroshi Hashimoto ,  Yoshiro Nishimoto ,  Tetsuya Takahashi ,  Akira Nakazumi ,  Masahiro Nishisaka ,  Toru Takahashi ,  Masahiko Toyoshima

发明人： Hiroshi Hashimoto ,  Yoshiro Nishimoto ,  Tetsuya Takahashi ,  Akira Nakazumi ,  Masahiro Nishisaka ,  Toru Takahashi ,  Masahiko Toyoshima

IPC分类号： H04M1100

CPC分类号： H04M9/082 ,  H04B3/234

摘要： The conventional speakerphone using the voice switch, when combined with the echo canceler, involves a problem that the threshold for switching the transmit/receive state of the voice switch cannot comply smoothly and stably with the performance variation of the echo canceler, thereby obstructing echo canceling in a manner that the voice switch cooperates with the echo canceler. The speakerphone of the invention estimates the performance variation of the adaptive filter by using the integrated value of a power of the receive signal or the transmit signal referred in the past when the adaptive filter learns, and varies the threshold in accordance with the performance variation. Thus, the speakerphone of the invention achieves a stable communication system that approaches to the fill duplex with the voice switching system and the echo canceling system combined.

摘要翻译： 使用语音切换的常规免提电话当与回波消除器组合时涉及到用于切换语音交换机的发送/接收状态的阈值不能顺利且稳定地符合回波消除器的性能变化，从而阻碍回波消除 语音交换机与回波消除器协同工作。本发明的扬声器电话通过使用接收信号的功率或过去所提及的发射信号的积分值来估计自适应滤波器的性能变化，当自适应滤波器 学习并根据性能变化改变阈值。 因此，本发明的扬声器电话实现了一种稳定的通信系统，其与语音交换系统和回声消除系统相结合地接近填充双工。