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音频信号理技术.ppt
音频信号的离散化指模拟的声音信号转换为数字的声音信号，这需要经过采样（Sampling）和量化（Quantization）两个步骤。采用这两个步骤方法又称为脉冲编码调制
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基于DCT域QIM的音频信息伪装算法
% 基于DCT域QIM的音频信息伪装算法 通信学报 2009
% 摘要：音频与图像相比具有信息冗余大、随机性强的特点，在音频中实现无误码的信息提取的难度更大。提出
% 一种基于DCT域QIM(quantization index modulation)的音频信息伪装算法，算法特点如下：应用QLM原理，以量
% 化的方式嵌入信息，根据量化区间与信息比特的映射关系提取信息，可
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speex回声消除算法
... -- probably by removing a "threshold effect" due to
quantization (rounding going to zero) when the gradient is small.
... "goal" this seems to
reduce the effect of quantization noise in the update phase. This
can be seen as ...
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Ldpc编码的介绍与应用
... topologies, respectively. Furthermore, by exploiting the inherent robustness of LLRs, it is shown, via simulations, that coarse quantization tables are sufficient to implement complex core operations with negligible or no loss in performance. The unified ...
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信息论基础（英文版）
... Noise 277
9.6 Gaussian Channels with Feedback 280
Summary 289
Problems 290
Historical Notes 299
10 Rate Distortion Theory 301
10.1 Quantization 301
10.2 Definitions 303
10.3 Calculation of the Rate Distortion Function 307
10.3.1 Binary Source 307
10.3.2 ...
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jpegsrc.v8d.tar.gz
... and viewing software, we have included
considerable functionality beyond the bare JPEG coding/decoding capability;
for example, the color quantization modules are not strictly part of JPEG
decoding, but they are essential for output to colormapped file ...
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Data_Compression+The+Complete+Reference+4th+edition
... Compression 27
1.5 Move-to-Front Coding 37
1.6 Scalar Quantization 40
1.7 Recursive Range Reduction 42
2 Statistical Methods 47
2. ... JBIG 369
4.12 JBIG2 378
4.13 Simple Images: EIDAC 389
4.14 Vector Quantization 390
4.15 Adaptive Vector Quantization 398
4. ...
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turbo系统 matlab 仿真代码 参考Dr.Wuyufei 有详细注释
... through a AWGN channel.
% Interleavers are randomly generated for each frame.
% While it's UNECESSARY in our first version!
%
% Log-MAP algorithm without quantization or approximation is used.
% By making use of ln(e^x+e^y) = max(x,y) + ln(1+e^(-abs(x-y ...
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XviD压缩包
Xvid（旧称为XviD）是一个开放源代码的MPEG-4视频编解码器，它是基于OpenDivX而编写的。Xvid是由一群原OpenDivX义务开发者在OpenDivX于2001年7月停止开发后自行开发的。Xvid支持多种编码模式，量化（Quantization）方式和范围控，运动侦测（Motion Search）和曲线平衡分配（Curve）等众多编码技术，对用户来说功能十分强大。Xvid的主要竞争对手是DivX。但Xvid是开放源代码的，而DivX则只有免费（不是自由）的版本和商用版本。
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RPE-LTE下的GSM全速率语音编解码算法（Matlab实现）
... yet for wavfiles sampled at any frequency. It
has been temporarily done only wavfiles with 8000 Hz sampling frequency.
Also that quantization effect hasn't been added yet. The codes will be
updated soon. We appolagize for the temporary inconvenience.
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