送话器是在声波的作用下，按照声压的变化规律，产生相应的电流变化(话流)的一种器件，即将声音信号转换成电信号的声电转换器件。从结构上分有炭精式、电磁式，压电式。
这套设备除了一般的电话送话器以外，还包括一个小萤光屏和一个电视摄像机。
In addition to the usual telephone hanDset the equipment includes a small television screen anD, combined with the screen, a television camera.
你看，传声器作用与电话的送话器很相像。
The microphone, you see, ACTS much like a telephone transmitter.
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。
The telephone contains a transmitter and receiver for converting back and forth between analog voice and analog (voice-frequency) electrical signals.
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