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在军民用通信设备中,由于设备接收电路接收到的无线电信号起伏变化,导致接收的音频信号不恒定,对后续音频信号处理电路的实现带来一定困难,必须采取相应的音频动态压缩技术。文章引入一种适合音频动态变化范围的自动增益控制技术,电路采用步进式数字自动增益控制,给出了实用电路的设计思想、电路组成及工作原理,实现了音频宽动态范围输入信号的压缩,满足音频信号不同增益控制的实际需要。
In the military and civilian communication equipment, the received audio signal is not constant due to the fluctuation of the radio signal received by the equipment receiving circuit, which brings some difficulties to the realization of the subsequent audio signal processing circuit. Therefore, the corresponding audio dynamic compression technology must be adopted. This paper introduces a kind of automatic gain control technology which is suitable for the dynamic range of audio. The circuit adopts step-by-step digital automatic gain control. The design idea, circuit composition and working principle of the practical circuit are given, and the compression of audio wide dynamic range input signal , To meet the actual needs of different audio signal gain control.