Matlab code for calculating masking threshold using psychoacoustic model.this involves graphical features

首先对输入音频PCM信号进行时频分析，决定MDCT的长度，即加窗，然后进行MDCT变换；同时对原始音频信号要进行FFT分析。两种变换的频谱系输入给心理声学模型单元，MDCT系数用于噪声掩蔽计算，H可结果用于音调掩蔽特性计算，共同构造总的掩蔽曲线。然后根据MDCT系数及掩蔽曲线，对频谱系数进行线性预测分析用LPC(Linear Prediction Coefficience，线性预测系数)表示频谱包络，即基底曲线(Floor Curve)；或通过线性分段逼近方式获得基底曲线。从MDCT系数中去掉

心理声学模型，频谱绘制，把人听到的声音模型展示出来，它解释人各种听感的生理原理。有需要的可以下载参考(Psychoacoustic model, spectral rendering, there is a need to download the reference)

Lame is an open source encoder wich features a new psychoacoustic model called GPsycho. It also brings joint stereo encoding and variable bitrate. Its quality is substantially better than ISO psy-model based encoders (such as Lame 2.1, BladeEnc, 8Hz-