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2-D median filtering with better boundaries response. A modified version of the MATLAB function medfilt2 that deals better with the boundaries. Unlike medfilt2, the function medfilt2m does not pad the matrix with extra elements on the edges, but computes the median using only elements in the matrix.

DDS用matlab实现的源程序，可以实现调频信号，和调相信号(DDS source code with matlab implementation, can achieve FM signal, and phase modulation signal)

Matlab 《统计工具箱》基本统计命令(Matlab statistic toolbox function)

求取信号的包络，信号的包络含有重要的调制信息，本程序给出了求取信号包络的方法(To strike a signal envelope, signal modulation envelope contains important information, this program gives way to strike a signal envelope)

1. 给定模拟信号：，式中，，。对进行采样，可得采样序列 选择采样频率=1 kHz，观测时间ms，观测所得序列及其幅频特性 改变采样频率=300Hz，观测此时的变化 令采样频率=200Hz，观测此时的变化 要求分析说明原理，绘出相应的序列及其它们对应的幅频特性曲线，指出的变化，说明为什么？(failed to translatefailed to translatefailed to translatefailed to translate)

说明：  本程序是遗传算法求极值,有助于对遗传算法的理解(This procedure is a genetic algorithm for extreme value, contribute to the understanding of the genetic algorithm)

很不错的RS纠错编码原理及其实现方法。pdf格式(rs encode and decode.)

脉冲编码调制(PCM)实现 编程实现PCM技术的三个过程：采样、量化与编码。 采样：低通连续信号采样，以 x=sin(200*t) m=x./(200*t) m=m.*m 为例说明低通采样定理，绘出信号时、频图形；带通连续信号采样，以x=sin(20*t) m=x./t 为例说明带通采样定理，绘出信号时、频图形。 量化：均匀量化，以幅度 的正弦信号为例实现为64级电平的均匀量化；非均匀量化，输入A律PCM编码器的正弦信号 ，采样序列为 ，将其进行PCM编码，给出编码器的输出码组序列 编码：以上述信号为例，实现A律的13折线近似法及国际标准PCM对数A律量化编码。(Pulse code modulation (PCM) to achieve PCM technology programming three processes: sampling, quantization and coding. Sample: low-pass continuous signal sampling to x = sin (200* t) m = x./(200* t) m = m.* m an example low-pass sampling theorem, draw the signal, frequency graphics bandpass sampling continuous signals to x = sin (20* t) m = x./t an example bandpass sampling theorem, draw the signal, frequency graph. Quantization: uniform quantization, in order to realize the magnitude of sinusoidal signal as an example for the 64 level uniform quantization non-uniform quantization, input A law PCM encoder sine signal, the sampling sequence, to be PCM encoded, the encoder is given The output code sequence Code: A Case Study of the signal to achieve the 13 A line approximation law and international standards on the number of A law PCM coding quantization.)

多载波系统中的交调失真，输入信号是频率在11Hz和 14Hz的双音带通信号。(Multicarrier system intermodulation distortion, the input signal is frequency 11Hz and 14Hz dual tape communication number.)

希尔伯特黄变换非常有用的初学资料，有很多实例可以参考(Hilbert Huang Transform is very useful beginner information, there are many instances can refer to)