... voice frequency circuit 音频电路 voice frequency receiver 音频接收机 voice frequency telegraph 音频电报 ...
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voice-frequency signal receiver 音频信号接收器
double voice multi-frequency receiver 双音多频接收器
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The telephone contains a transmitter and receiver for converting back and forth between analog voice and analog (voice-frequency) electrical signals.
电话机包括一个送话器和一个受话器，用来在模拟语音和模拟电信号之间进行变换。
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