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This 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 -
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Companding is essentially a technique for achieving non-uniform quantization. There are basically 2 methods which are most popular in literature.:-A-law companding and u-law companding. These algorithms help in achieving to an extend, compression. Th
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对给定语音信号进行抽样、量化和13折线PCM编码,经过传输后,接收端进行PCM译码,对此过程进行matlab仿真分析。-Given speech signal sampling, quantization and PCM 13 line coding, after transmission, the receiver for PCM decoding, matlab simulation of this process
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(1) 在c或matlab环境下实现卷积码编码模块,并嵌入实验一的通信链路中,要求编码模块有一定通用性可以设定约束长度、卷积码抽头系数;
(2) 设定约束度分别为7、9的1/2卷积码,仿真分析这些码的硬判决译码性能、绘制误码性能曲线,对比不同约束度下卷积码的性能,分析译码复杂性;
(3) 设定约束度为7的1/2卷积码,进行无量化软判决译码,仿真分析比较软硬判决译码性能;
(4) 设定约束度为7的1/2卷积码,量化比特分别为3、4、5、6,仿真分析比较量化对误码性能的影响;
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使用matlab实现的jpeg基本系统,输入为灰度图像,输出为使用‘0’‘1’字符表示的字符串。
包括dct编码与解码、量化与反量化,Huffman编码与解码(The JPEG basic system implemented with MATLAB is entered into a gray image, and the output is a string represented with a '0' '1' character.
Including DCT coding and de
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