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产生长度为1000的标准正太分布的随机信号,画出时域波形及频谱;
采用u=255的非均匀PCM编码,每符号为8bit,画输入-输出关系图;
计算信号量化噪声比(SQNR);
信道误码率为10-3;
解码,并画出u律反变换后的信号时域波形及频谱。
扩展要求:
采用均匀PCM、量化级数可变、信道误码率可变。
- have a standard len
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利用Matlab仿真脉冲编码调制(PCM)及A律、μ律PCM对声音进行压缩编解码过程。
脉冲编码调制(PCM,Pulse Code Modulation)是一种将模拟语音信号转换成数字信号的编码方式。波形编码器的作用是对采样后的信号样本进行量化和编码。从数学上来看,量化过程就是把一个连续幅度值的无限数集合映射成一个离散幅度值的有限数集合,编码就是用一组二进制数来表示这些映射后的有限数。国际标准化的PCM采用折叠二进制码,符合长途电话质量。根据量化方法的不同,PCM可分为均匀量化PCM和对数
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介绍A律13折线的原理,很好很强大,非均匀量化参考好资料-A law introduced the principle of 13 line, nice and strong, non-uniform quantization good reference information
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Quantization (signal processing)
uniformly and non-uniformily using A and miu law od companding.
simulation using simulink/matlab
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关于PCM的编码程序,通过输入量化电平,给出经过A律13折线压缩的8位二进制码元,已经经过本人翻译。-On the PCM coding process, by entering the quantization level, is given through the law of 13 Line A compressed 8-bit binary code yuan, has been translated himself.
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这是一个比较完整的JPEG压缩程序,支持 彩色/灰度、Y分量水平/垂直采
样律、图像质量 调整。使用的是最简单的基线系统(BaseLine)压缩方式,
量化表及Huffman表都是与ACDSee一致的,没有提供自适应Huffman表压缩功能。-This is a more complete JPEG compression process, support for color/grayscale, Y component horizontal/vertical sampling law,
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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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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
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G.711使用64Kbps的带宽,可将14bits转换成8bits。目前G.711有两个编码方式,A-law以及Mu-law。-G.711 defines two main compression algorithms, the µ -law algorithm (used in North America & Japan) and A-law algorithm (used in Europe and the rest of the world). Both are logarith
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A律十三折线量化编码的实现。-A thirteen line Quantization law implementation.
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脉冲编码调制(PCM,Pulse Code Modulation)是一种将模拟语音信号转换成数字信号的编码方式,从数学上来看,量化过程就是把一个连续幅度值的无限数集合映射成一个离散幅度值的有限数集合,编码就是用一组二进制数来表示这些映射后的有限数。
国际标准化的PCM采用折叠二进制码,符合长途电话质量。根据量化方法的不同,PCM 可分为均匀量化PCM 和对数PCM 两大类,对数PCM中,A律和μ律编码都已被定为国际标准。
本程序实现了A律、μ律以及均匀量化三种PCM,
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For a file(.wave)
• Find the sampling frequency and the number of bits per sample.
• Re-quantize the samples using the following methods:
o Linear Quantization
o A-Law Companding with A=87.6
o μ-Law Companding with μ=255
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LBG分类算法
用初始室心随机法和扰动因子分裂法两种方法,比较不同方法不同参数设置时的分类性能。
-LBG classification algorithm vector quantization: vector normalization within a certain range for a particular type, consists of two steps: first generate a codebook, which is the speech feature v
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语音信号的量化程序,直接量化,μ律压缩,A律压缩-quantization of voice signal, μ-law compress and A-law compress
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产生一个幅度为1,频率为w=1的正弦序列,采用非均匀8级量化和16级量化(类似A律13折线的方法),在同一坐标系内绘出原始信号和量化信号的曲线,并计算量化的S/N-Generating an amplitude of 1 and a frequency of the sinusoidal sequence w = 1, the use of non-uniform quantization 8 and 16 quantization (similar to Method A-law broken
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PCM编译码实验,自己通信原理的实验。对正弦信号进行抽样、量化和A律PCM编码,经过传输后,接收端进行PCM译码-PCM codec test their own communication principle experiment. Sinusoidal signal sampling, quantization and A-law PCM coding, after transmission, the receiving end PCM decoding
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使用MATLAB,
实现对一个余弦信号的均匀量化和A律非均匀量化,
并将结果输出在图形界面上。-
Using MATLAB,
Cosine signals to achieve a uniform quantization and A-law non-uniform quantization,
And outputs the results in a graphical interface.
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pcm编码A律Simulink和MATLAB(PCM in the communication system to complete the voice signal digital function, and its implementation mainly includes three steps to complete: sampling, quantization, coding. The binary representation of time discrete, amplitud
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数字通信中BPSK和DPSK调制以及PCM的均匀量化编码和A律13折近似编码的matlab例程(In digital communications, BPSK and DPSK modulation, and PCM uniform quantization coding and A law 87% off approximate encoding matlab routines)
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仿真求解正弦波通过 A 律十三折线编译码后的量化信噪比。////////////////////////////////(The quantization SNR of sine wave through A-Law 13 fold code is simulated.)
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