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    • 10. 发明授权
    • Echo suppressor
    • 回声抑制器
    • US4864608A
    • 1989-09-05
    • US84323
    • 1987-08-10
    • Takanori MiyamotoSumie NakabayashiYoshiro SuzukiKazuhiro KondoShinichi Niina
    • Takanori MiyamotoSumie NakabayashiYoshiro SuzukiKazuhiro KondoShinichi Niina
    • H04B3/20
    • H04B3/20
    • An echo suppressor for a communication system wherein a signal sent to a transmitting line is returned to a receiving line with some delay. The suppressor comprises an attenuator for attenuating the amplitude of a received speech signal. The transmitting speech signal amplitude level is compared to the amplitude of a receiving speech signal, and according to the result obtained, a signal for controlling the signal attenuation of the attenuator is generated. The delay time, until the attenuation control signal operates on the attenuator according to a change in the amplitude level of the receiving speech signal, is controlled. The controlled delay time is normally held at a predetermined maximum value, and is minimized when a change in amplitude of the receiving speech signal indicates a beginning of speech. Thus, an echo of the speech uttered by a near end user can be suppressed without impairing a beginning of the speech signal uttered by a far end user.
    • 用于通信系统的回波抑制器,其中发送到传输线的信号以一定延迟返回到接收线。 抑制器包括用于衰减接收到的语音信号的振幅的衰减器。 将发送语音信号幅度电平与接收语音信号的振幅进行比较,根据得到的结果,产生用于控制衰减器的信号衰减的信号。 直到衰减控制信号根据接收语音信号的幅度电平的变化对衰减器进行操作的延迟时间被控制。 受控延迟时间通常保持在预定的最大值,并且当接收语音信号的幅度变化指示语音的开始时被最小化。 因此,可以抑制由近端用户发出的语音的回声,而不会损害远端用户发出的语音信号的开始。