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说明：  本文件夹包含的是针对电话交换系统的C51程序源代码，包含了电话串口之间的通信功能，以及控制回铃音的程序源代码(This folder contains the telephone exchange system for the C51 source code, including a telephone communication between the serial port, and control ring back tone of the program source code)

it is a matlabe code

PID模糊控制程序,附带simulink仿真图形(PID fuzzy control procedures)

Mathematica 环境下GNSS导航信号体制中的BOC调制、BPSK调制的功率谱计算及频谱图绘制程序，相关函数计算(GNSS navigation signal system in the BOC Mathematica modulation, BPSK modulation of the power spectrum calculation and spectral mapping procedures, the calculation of the correlation function)

the attached file consists of matlab code for implementation of sequential importance sampling particle filter given in IEEE paper entitled as "A TUTORIAL ON PARTICLE FILTERS FOR ONLINE NONLINEAR NON GUASSIAN BAYESIAN TRACKING"

unsecnted Kalman Filter

利用matla设计的CIC内插滤波器，其中包含了其相应的补偿滤波器。(Matla designed using CIC interpolation filters, which contains the corresponding compensation filter.)

基于MATLAB的小波阈值去噪方法的研究（其中包括软阈值方法，硬阈值方法，广义小波阈值函数，自适应特征阈值等方法的代码）(MATLAB-based wavelet threshold denoising (including soft-thresholding method, hard threshold method, generalized wavelet thresholding function, adaptive threshold methods such as feature code))

matlab_introduction and def

关于基础PIDmatlab仿真的源码，适合基础学习。(About source basis PIDmatlab simulation, suitable for basic learning.)