chap4

butterworth lowpass filter used for finding speech signal.

说明：  二段桥的搭建方法，简单明了，看了还想看，不看后会…………(Bridge Sec)

test1.m 固定增量法求分界面 test2.m 利用误差平方和函数集群 delet.m 删除数组元素 Err.m 计算误差平方和 Distance.m 欧拉距离计算 (test1.m fixed incremental method for use interface test2.m squared error function cluster de let.m delete array elements Err.m calculation error square Distance.m Euler distance)

PSPICS使用手册,详细介绍了PSPICE的使用方法，是一本很好的入门书籍。(examples for the use of pspice)

使用MATLAB编的一段程序。用于计算时间序列的盒维数。(make it in matlab and be used to analys fractal demination)

说明：  解波动方程的matlab 程序，分别用L-W格式，MacCormark格式(matlab program)

this program simulates 2D electromagnetic Maxwell equations in transverse magnetic mode , by using finite difference time domain method FDTD

PSO算法，采用matlab编程，比较实用，可以改变参数后直接使用(PSO algorithm, using matlab programming, more practical, you can change the parameters directly)

MATLAB CODE FOR extrema.m, extrema2.m

研究表明超高斯分布更加贴近语音信号的实际分布，然而语音信号很难用单一的概率密度 函数准确描述，针对这一情况，提出了一种用超高斯混合模型对语音信号幅度谱建模的新方法，并推导了 基于此模型的幅度谱最小均方误差估的估计式。仿真结果表明：与传统的短时谱估计算法相比，该算法不 仅能够进一步提高增强语音的信噪比，而且可以有效减小增强语音的失真度，提高增强语音的主观感知 质量。 (Recent research indicates that the speech spectral amplitude distributions could be fairly described with super-Gaussian probability density function. However, the complexity of speech signal determines that the distribution statistics ofspeech signal could not be well described by single simple function. Thus a super-Gaussian mixture model for speech spectral amplitude is proposed, and with this model, a minimum mean-square error (MMSE) estimator for speech signals spectral amplitude is derived. The simulation results show that this algorithm based on Gaussian and super-Gaussian speech model could achieve better noise suppression and lower speech distortion as compared with the conventional short-time spectral amplitude estimation algorithm. )