说明：Kamath于2002年提出的多频带谱减法,用于调节频率减法系数以及信噪比。注意：信号的第一个0.25sec用于噪声建模。-Multiband_Kamath.m Descr iption: Multiband spectral subtraction as proposed by Kamath 2002. Uses adjusts the subtraction coefficient with the frequency as well as the SNR. note