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TPA2018D1: 有底噪,如何调整放大倍率

Part Number: TPA2018D1

请问fixed gain值这个值是可以改变放大倍率吗,因为目前底噪比较大声,所以想调小放大倍率试下,但是改fixed gain这个值,对声音大小并没有变化,如果不是这个值,哪个可以实现呢