The sounds and images are converted into electrical signals by a microphone( sounds) or video camera( images), amplified, and used to modulate a carrier wave that has been generated by an oscillator circuit in a transmitter.
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- 声音合图像由话筒(音)摄像机(像)换为电子信号,经过放大后,用来调制发射器中一个振荡器产生的负载电波。