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Fixed 7/17/93 to use inverse-hessian instead of hessian itself in bfgs

巴克码的编码程序，基础程序可以好好学习下，希望有帮助！(Barker coding procedures, based on the program can learn under, want to help!)

包含FIR IIR窗函数法，频率采样法，模拟滤波器等 (FIR IIR contains window function method, frequency sampling method, such as analog filters)

自己编写的PSO算法优化BPM文件，用于时滞系统的辨识，辨识效果还不错。(This is a M file of BPNN I have written for the identification of delay systems identification.The simulation result shows that the method is valid.)

直流电机双闭环调速系统，亲测可用,欢迎下载(DC motor double closed loop speed regulation system, pro test available)

Program to encode in JPEG algorithm. Note, this doesnot output JPEG file. but a matlab demonstration of the process how jpeg is created.

说明：  本程序实现了RGB图像转化为灰度图像，而后对图像进行了二值化，比较适合初学者，因为很多复杂的程序初学者比较难理解，我写的这个程序可以作为入门程序。(This program realized RGB images to gray image, and then to the binary image.It is suitable for beginners, because many complicated procedure is difficult for beginners, I write this program can be used as introductory programs.)

leafrong method matlab code

画包络谱，功率谱程序，初学者试着看看，对你有用。( U753B u5103 u5B09 u5B09 u5B09 u0B05 )

说明：  基于负熵的盲源分离算法，可以用于语音的盲分离，提高语音信号质量。本代码中，对原始信号分别为正弦波，方波，和随机信号，通过高斯信道的混合矩阵，获得接收信号，并通过基于负熵的盲源分离算法分理处原始信号。PS：Matlab版本为2018Ra(The blind source separation algorithm based on negative entropy can be used for speech blind separation and improve the quality of speech signal. In this code, for the original signal, sine wave, square wave and random signal, the received signal is obtained through the mixture matrix of the Gauss channel, and the original signal is processed by the blind source separation algorithm based on negative entropy. PS: MATLAB Version 2018Ra)