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在一般近代的短波无线电话终端机上,都装有话音控制增益的放大器,以便对不同的用户话音进行自动的电平调整,供给发射机一个足够高而动态变化很小的调制信号,以保证发射机提供足够的输出功率.这种音控放大器,在利用电子管电路设计时,有用变跨导电子管来自动调整增益;也有将放大器的增益固定,而在放大器之前或放大器级际之间插入变阻电路,用话音来控制变阻电路中流过的电流,以达到输出电平
In modern modern shortwave radiotelephone terminals, are equipped with voice-controlled gain amplifier, in order to automatically adjust the voice of different users to provide a sufficiently high and dynamic transmitter transmitter modulation signal to ensure that the launch Machine to provide sufficient output power of the audio amplifier, the use of the tube circuit design, the useful variable transconductance tube to automatically adjust the gain; also have the gain of the amplifier fixed, and before or in the amplifier amplifier interstage variable resistance Circuit, using voice to control the current flowing through the variable resistance circuit, in order to achieve the output level