编码

For reducing boundary distortion area, the elevations of grid DEM are viewed as a discrete sequence under a generalized coordinate, so that the boundary problem of two-dimensional discrete wavelet transform is turned into the boundary problem of one-dimensional discrete wavelet transform, which not only greatly reduces the boundary distortion area, improves the precision of reconstructed DEM data near the boundary, but also decreases the number of zeros adding on the boundary for wavelet transform, and boosts the compression ratio. On the basis of analyzing the distribution characteristics of coefficients in low and high frequency bands, a mixed entropy coding plan is applied, and a high efficient quantizator called"self-adaptive hard threshold"is established, which is helpful for improving the precision of the reconstructed DEM data and for enhancing compression ratio.

为了减小小波变换山区格网DEM数据压缩中边界失真区域，将山区格网DEM高程值视为广义坐标下的离散随机序列，把二维离散小波变换中的边界问题转换为一维离散小波变换中的边界问题，不仅大大减少了小波变换边界失真区域，提高了重构DEM数据边界点的精度，而且减少了边界补零个数，提高了压缩比；通过对山区格网DEM数据小波变换低频区和高频区变换系数分布特点的分析，采取了霍夫曼—游程混合熵编码方案，设计了高效、低失真的"自适应硬阈值"量化器，即对低频区变换系数不进行量化，直接进行霍夫曼编码；对高频区变换系数则先用"自适应硬阈值"方法量化处理，再进行游程编码。

By analyzing the current status of speech coding, it proposes that low bit rate speech coding is hot off the press.

首先通过分析当前语音编码的现状，提出了低速率语音混合编码是现代语音编码研究的热点。

This paper proposes 8 kinds of specific technique by the Huffman encoding as a model of the entropy encoding.

本文是以Huffman编码作为熵编码的一种代表，介绍8种关于Huffman编码的具体实现办法。

After convolutional encoding , the data is reordered by the interleaver. At the receiver , the data pass through deinterleaver for the purpose of dividing possible consecutive error bursts into inconsecutive code , so it can be corrected by convolutional decoding. Matrix interleaver with CPLD is designed , because it is convenient to program. Considering various matrix interleaver , an all - purpose matrix interleaver is designed. You can ap2 ply it to your own project only altering initial parameters.

交织编码在3G系统中已经大量使用，数据通过卷积编码后进行分组交织，在接收端完成反交织，将连续误码分散成非连续误码，从而使得误码在纠错允许的范围内得到纠正； CPLD 具有方便的在线编程功能，可以用来实现交织编码；考虑到矩阵交织器的多样性而设计的通用矩阵交织器，只须通过修改一些参数值即可实现不同的交织器，大大节省了设计时间。

The Turbo codes and interleave are Key techniques in Third Generation Mobile Communication.

第三代移动通信系统中，其编码关键技术就是Turbo码编码技术，而交织器技术又很大程度上影响着Turbo码的编码性能。

This algorithm involves multi-frame motion compensationk,rate-distortion optimizing strategy with Lagrangian cost function and context-based adaptive arithmetic coding.

根据系统的终点和初始状态，提出了泛横向对称编码和泛纵向对称编码理论，为进一步拓展对称编码理论的应用空间提供了理论基础。

The coding method includes the steps of representing respective digital data by digits of a predetermined same number, and coding the digital data represented by digits of the same number by a predetermined coding method from the uppermost significant digit sequence to the least significant digit sequence.

编码方法包括以下步骤：用相同的预定位数表示有关数字数据，以及使用预定编码方法自最高有效位序列至最低有效位序列将由相同位数表示的数字数据编码。

Combinational Logic design which based on the theory of Linear block code is the circuit map of Linear block code using AND-gate, OR-gate, Flip-flop and so on. VHDL design is the hardware description of the circuit map to make linear block code into realization.

组合逻辑电路设计，是根据线性分组编码理论，利用与非门、触发器等逻辑器件搭建起来的电路原理图；VHDL设计，是将线性分组编码理论通过用VHDL描述，实现其编码功能。

Combinational Logic design which based on the theory of Linear block code is the circuit mapof Linear block code using AND-gate, OR-gate, Flip-flop and so on. VHDL design is the hardware description of the circuit map to make linear block code into realization.

组合逻辑电路设计，是根据线性分组编码理论，利用与非门、触发器等逻辑器件搭建起来的电路原理图；VHDL设计，是将线性分组编码理论通过用VHDL描述，实现其编码功能。

Scalable Zerotree Wavelet Entropy coding codes the low-low band uniquely and the other bands with the multiscale zerotree entropy coding scheme to achieve a fully scalable.

尺度小波零树编码将低通子带独立编码、其它子带多尺度零树熵编码，实现了自然/合成视频信息的空间/质量尺度完全可调。

John Robbins lives with his family in Santa Cruz, California.

约翰罗宾和家人居住在加利福尼亚州的圣克鲁斯县。

The international background is mainly the economic ties among different nations tented to be widen and deepen at the peace and development times.

国际背景主要是和平与发展时代条件下的世界各国经济贸易联系的日益加深。