中文说明：mmse降噪，高斯加噪，绘制语谱图，需预先在matlab中安装voicebox。包含三个mmse降噪函数。使用matlab2016a以前版本运行。
English Description：
MMSE noise reduction, Gaussian noise, drawing spectrogram, need to install voicebox in MATLAB in advance. It contains three MMSE noise reduction functions. Run using versions prior to Matlab 2016a.