A significant amount of power is used by the broadcast transmitter to send the sync pulse.

由于大量的功率被广播发射机用来发送同步脉冲,一般将视频信号的极性设计为在传送同步信号降低功耗的方式.

An instrument that converts sound waves into an electric current, usually fed into an amplifier, a recorder, or a broadcast transmitter.

将声波转变成电流的工具，通常接至扩音器，录音机或广播发射机上。