The lower bound on gain factor is obtained by keeping the speech distortion smaller than the residual noise.Accordingly, the corresponding lower bound on the NMT is also obtained.

• 我们限制语音失真必须小于残留杂讯为准则，便可以得到增益因子的下限值，因此其对应的杂讯遮蔽阈值也会得到一个下限值；