音频处理电路的作用就是将音频调频信号解调成伴音信号供扬声器发出声音。伴音调频副载波的频率各国标准不同 ,一般都在 4 .5～ 8ＭＨｚ之间 ,我国采用6 .6ＭＨｚ。目前卫星电视接收机中的伴音解调电路都设计为可调谐的 ,能适应各种体制的需要。卫星电视广播的伴音采用模拟信号 Audio processing circuit is the role of the audio frequency modulation signal demodulated into audio signals for the speaker to sound. Audio FM subcarrier frequency of different national standards, are generally between 4.5 ~ 8MHz, China uses 6 .6MHz. At present, the sound demodulation circuits in satellite TV receivers are all designed to be tunable and can adapt to the needs of various systems. The sound of satellite television uses analogue signals