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    • 1. 发明授权
    • Half-duplex speakerphone echo canceler
    • 半双工扬声器回声消除器
    • US08923508B2
    • 2014-12-30
    • US13490596
    • 2012-06-07
    • Donald R. LaturellKannan SrinivasanChao-pin Chen
    • Donald R. LaturellKannan SrinivasanChao-pin Chen
    • H04M9/08
    • H04M9/082
    • A speakerphone having transmit path with a microphone and a first amplifier having a gain determined by a controller and an input coupled to the microphone, a receive path with a second amplifier having a gain determined by the controller and a speaker coupled to an output of the second amplifier, and operable in a half-duplex mode using an adaptive echo canceller to at least partially remove from the transmit path acoustically-coupled signals from the receive path. The controller increases the gain of the first amplifier and decreases the gain of the second amplifier when a level of signals in the transmit path exceed a level of signals in the receive path, and decreases the gain of the first amplifier and increases the gain of the second amplifier when the level of signals in the receive path exceed the level of signals in the transmit path.
    • 具有麦克风的发送路径的扬声器和具有由控制器确定的增益和耦合到麦克风的输入的第一放大器,具有由控制器确定的增益的第二放大器的接收路径和耦合到该麦克风的输出的扬声器 第二放大器,并且可以使用自适应回波消除器以半双工模式操作以至少部分地从发送路径去除来自接收路径的声耦合信号。 当发射路径中的信号电平超过接收路径中的信号电平时,控制器增加第一放大器的增益并降低第二放大器的增益,并且降低第一放大器的增益并增加第 第二放大器当接收路径中的信号电平超过发送路径中的信号电平时。