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低通巴特沃斯滤波器设计求阶数，适合广大学生们参考，(Low-pass Butterworth filter design requirements order, for the majority of students reference)

ElGamal數位簽章加解密程式, 可自行修改訊息M用以產生簽章S1與S2(ElGamal digital signature encryption and decryption program can modify the message M to produce the Signature S1 and S2)

Oqpsk调制与解调matlab源代码，用于在matlab中仿真oqpsk调制与解调的过程，非常适合初学者。(Oqpsk modulation and demodulation matlab source code for the simulation in matlab oqpsk modulation and demodulation process, very suitable for beginners.)

audio signals coding using lpc

this is the file for rasbery pi program in beween the master and slave device

说明：  基于局域法多步预报模型的混沌时间序列预报模型，对多个典型混沌序列的仿真测试表明，本算法具有良好的多步预测精度和较好的抗噪声能力(based multi-step prediction model of chaotic time series prediction model, a number of typical chaotic sequence of simulation tests show that the algorithm has a good multi-step forecast accuracy and better noise immunity)

说明：  本文件主要是针对于粒子群算法在matlab环境中地应用说编写地m文件！其中粒子群算法地目标函数可在源程序中自行更改！ -(this document is mainly targeted at PSO algorithm in Matlab environment application to the preparation of that document m! )

基于PCA的故障检测 采用主元分析法 可以对其进行故障检测 生成ABC图(Based on PCA fault detection using principal component analysis method can generate the fault detection ABC figure)

线性卡尔曼滤波，二维状态空间模型一般的卡尔曼滤波(kalman fitering)

wave packet , particle in box , quantum