码本

A pair of bi -directional recursive functions are derived based on this codebook, which are used to drive the dual processors to operate parallelly and efficiently.

该编码器构造了一个结构化的高斯噪声码本，并利用由此导出的双向递推求加权滤波器响应的公式，实现了快速的码本搜索过程。

A new method for updating the codebook is proposed to improve the accuracy of the adaptive backward codebook.

为了提高自适应后向码本的精度，提出了一种码本更新的新算法。

And its conversion of Line Spectral Pair and the production of adaptive codebook are different from that of traditional CELP.

在线谱对的转换和自适应码本生成方面也采用了有别于传统码本激励线性预测算法的新技术。

The main work of this dissertation is that after the conventional codebook design algorithm is used to decrease the expected distortion, evolutionary algorithm is introduced into vector quantization based on the partial distortion theorem to design the optimal codebook.

本论文的主要工作正是在利用传统码本设计算法减少平均误差的前提下，根据矢量量化的部分失真定理，引入进化算法，设计出较优的码本。

It is based on the method of modeling mobile voice channel and system identification is made so that the waveform samples are designed in frequency domain with less signal distortion.Then the waveform codebook is gotten by a genetic algorithm which has the maximum Euclidean distance.Thus,the modulation and demodulation are equivalent to the mapping from index to waveforms and from waveforms to index.

提出了对移动话音业务信道建模的思想，通过系统辨识获得模型的频率响应特性，在波形畸变较小的频带范围设计波形频谱，采用遗传算法在时域样本空间全局寻优获得欧几里德距离最大的波形码本，通过码本索引值和波形矢量的映射和解映射来实现数据的调制和解调。

Mainly in a method of the lattice vector quantifying coding and decoding, a new basic code book is selected out and directly or indirectly comprises all points whose value is less than or equal to 3 of any dimension in a RE point set, and points on a fourth grade hypersphere in the basic code book are all odd points so that part of nearest adjoint point values can be comprised in the basic code book only via corresponding odd number processing.

一种格矢量量化编解码的实现方法及装置，其主要是在格矢量量化编码方案中，选定新的基础码本，在该基础码本中直接或间接地包含了RE 8 点集中任意维的数值小于等于3的所有点，且该基础码本中的第4级超球面上的点全部为奇数点，以使得部分的最近邻点数值仅经过相应的奇数化处理便可以包含于基础码本中。

The norm and the angle made with the center line by the vector of the codeword are computed for each codeword off-line firstly, then the codewords are ordered according to the ascending order of their norm.

文章提出了一种改进的等范数最近邻码本矢量搜索算法，该算法预先离线计算好各码本矢量的2-范数和它与中心线的矢量夹角，再根据各码本矢量的2-范数进行升序排列。

Sixteen codebooks are equivalent to five ones, and then the best codebook is found by the tree search method.

将16组预编码码本等效为5组预编码码本，再通过树搜索找到最佳码本。

A codebook is used for feedbacking power distribution vector, which can effectively reduce the feedback amount of information; the use of two codebooks are used at the same time, which can respectively feedback the power distribution vector and pre-code matrix and can improve the transmission performance of the system under the condition of limited feedback.

使用码本反馈功率分配矢量，可以有效地减少信息的反馈量。同时使用两个码本，分别反馈功率分配矢量和预编码矩阵，可以在有限反馈的条件下提高系统的传输性能。

Improvements are made on the vector quantization LBG algorithm, the specific steps for producing the initial codebooks based on split method are also presented and their comparison is obtained by means of simulation.

文中还对已有的LBG(Linde，Buzo and Gray)算法进行了改进，用分裂法构造初始码本，给出量化码本设计算法的具体步骤，并通过仿真对两者产生的码本作了对比。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。