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    • 10. 发明申请
    • ECHO CANCELLATION
    • ECHO取消
    • US20130230183A1
    • 2013-09-05
    • US13410677
    • 2012-03-02
    • Joakim ErikssonJonny Strandh
    • Joakim ErikssonJonny Strandh
    • H04B3/20H04R3/00
    • H04R3/02H03F3/185H03F2200/03H03F2203/45076H03F2203/45082H03F2203/45084H03F2203/45088H04R19/016
    • The invention is directed to echo cancellation for a microphone system. An exemplary microphone system comprises a first transistor, wherein a gate terminal of the first transistor is connected to a ground terminal via a microphone electret element, the microphone electret element being associated with a capacitance and a voltage, the microphone electret element reverse biasing the first transistor; and a second transistor in parallel with the first transistor, wherein a gate terminal of the second transistor is connected to the ground terminal via a capacitor, the capacitance of the capacitor being selected to suppress at least a portion of a common mode signal, and wherein the gate terminal of the second transistor is not connected to the microphone electret element. The common mode signal comprises the echo, which may be the output of a speaker system that is received as input to the microphone system.
    • 本发明涉及用于麦克风系统的回波消除。 示例性麦克风系统包括第一晶体管,其中第一晶体管的栅极端子经由麦克风驻极体元件连接到接地端子,所述麦克风驻极体元件与电容和电压相关联,所述麦克风驻极体元件反向偏置所述第一晶体管 晶体管 以及与所述第一晶体管并联的第二晶体管,其中所述第二晶体管的栅极端子经由电容器连接到所述接地端子,所述电容器的电容被选择为抑制共模信号的至少一部分,并且其中 第二晶体管的栅极端子不连接到麦克风驻极体元件。 共模信号包括回波,其可以是作为麦克风系统的输入接收的扬声器系统的输出。