BUTTERCHEBY

This is a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious. (This is a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious. )

graphics and data analysis program in matlab

HHT变换，用于实现希尔伯特黄变换，源代码附上(Hilbert transform)

code NRZ nodeur NRZ sous matlab

说明：  noma的固定算法和树形算法的matlab仿真，可以直接运行。(Matlab simulation of fixed algorithm and tree algorithm of noma can run directly.)

数值积分法通过matlab实现，对于初学者非常有用。从书上下载的源代码。(Achieved by numerical integration matlab, very useful for beginners. Downloaded from the book source code.)

双音多频 DTMF（ Dual Tone Multi-Frequency ）信号，是用两个特定的单音频率信号的组合来代表数字或功能(DTMF DTMF (Dual Tone Multi-Frequency) signals, use of two specific combinations of tone frequency signals to represent the number or function)

利用背景抑制实现复杂背景下的小目标检测，具有一定的实用性。(This program realizes small target detection under complex background by background suppression , and it possesses a certain practically)

关于数字信号处理的MATLAB例程，包括随机信号产生，线性调频Z变换，卷积(MATLAB on digital signal processing routines, including the random signal generation, chirp Z transform, convolution)

seismic response analysis of MDOF structures using wilson-theta method