介绍一种采用DAC0832作为数控衰减器构成的自动增益控制电路，其外围电路非常简单，受控等级可达256级。
Presented in this paper is a digital AGC circuit that is constituted with digital attenuator DAC0832. Its controlled grade can reach 256 and the external circuit is very simple.
麦克风增益按钮，按下此钮会激活固定在麦克风内的衰减器，它是当本机工作在高噪音环境下使用。
Mic GAIN button. Pressing this button activates the built-in microphone attenuator. This feature is designed to be used when operating the Alan 9001 in high ambient noise environments.
麦克风增益按钮，按下此钮会激活固定在麦克风内的衰减器，它是当本机工作在高噪音环境下使用。
Mic GAIN button. Pressing this button activates the built-in microphone attenuator. This feature is designed to be used when operating the Alan 9001 in high ambient noise environments.
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