1)QAGC Quiet Automatic Gain Control,无噪音自动增益控制2)quiet automatic gain control,无噪声自动增益控制3)quiet automatic gain control,静噪自动增益控制(电信)4)quiet automatic gain control,静噪自动增益控制5)quiet qutomatic gain control,无噪声增益控制6)QAVC Quiet Automatic Volume Control,无噪声自动音量控制
