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.
英
美
- 聲音合圖像由話(huà)筒(音)攝像機(像)換為電子信號，經(jīng)過(guò)放大后，用來(lái)調制發(fā)射器中一個(gè)振蕩器產(chǎn)生的負載電波。
