lmstest_tien

正交相移键控 (Quadrature Phase Shift Keying)简称“QPSK”，是一种数字调制方式。它分为绝对相移和相对相移两种。由于绝对相移方式存在相位模糊问题，所以在实际中主要采用相对移相方式DQPSK。目前已经广泛应用于无线通信中，成为现代通信中一种十分重要的调制解调方式。(QPSK THAT IS TO SAY....)

音频频谱的分析程序,在程序中实现了采样速率的提取(Audio spectrum analysis procedures, the procedures to achieve a sampling rate of extraction)

代码是自行编写的基-2FFT算法，并与MATLAB系统自带的FFT作比较(This is code for fft2dit， which is self-coding. compare is considered between fft and fft2dit)

这是一个凯瑟窗的例子，利于凯瑟窗做成一个带通滤波器(This is a Kaiser window example, conducive to the Kaiser window into a band-pass filter )

说明：  采用谱元法计算声传播问题，带matlab代码(spectral method used for wave transmission problems, with matlab code)

说明：  一段带噪信号经过一butterworth低通滤波器后的输出，再求出其频谱！(butterworth)

rake接收，walsh码直接扩频，三种分集合并方式(rake receiver, walsh code direct spread spectrum, three kinds of collection and methods)

切比雪夫滤波器的设计与实现,设计的滤波器可满足通带内平坦的群延迟响应和通带外足够大的的衰减(Design and Implementation of Schiff cut filter, the filter designed to meet the passband than flat group delay response and pass-band attenuation is large enough)

A program used for feature extraction in matlab. Can be used for emotion recognition in artificial neural network.

matlab for cosine_modulated_gaussian