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一、概述在立体声收音机中,为了把接收到的导频制立体声信号还原成为左、右两个声道的音频信号,必须采用适合于导频制工作的立体声解码电路来处理鉴频器输出的立体声复合信号。此类立体声解码电路,具有单声兼容性,即当接收单声广播节目或立体声信号太弱时,立体声解码电路能自动工作于单声状态,也可以手动置定在单声工作状态。工作状态最好能以指示灯的形式表明。综上所述,一个功能较完善的解码电路,应该具备图1所示的三个基本组成部分:
I. Overview In the stereo radio, in order to restore the received pilot system stereo signal into the left and right two-channel audio signal, you must use suitable for pilot system stereo decoding circuit to deal with the output of the discriminator Stereo composite signal. Such stereo decoding circuit, with monophonic compatibility, that is, when receiving monaural broadcast programs or stereo signal is too weak, the stereo decoding circuit can automatically work in monophonic state, you can also manually set in the mono working state. The best working condition can be indicated in the form of indicator light. In summary, a more complete decoding circuit should have the three basic components shown in Figure 1: