查询词典 symbolic coding

A character-codes model based pattern recognition method by using amplitude data of targets frequency response is proposed after the establishment of high frequency response equation of radar targets. The method uses the same unvariant character-codes to express the same target of different angles and uses sequential separating of regions of target's reference variables to obtain multiple coding vectors of all regions for every target. The category and pose of target can be determined after a two-staged classification processing such as coding processing of target range profile data and errors correcting processing of coded data. The two-stage classification results are used to target identification as posterior hypothesis to be tested by sufficient convincing and necessary convincing. The character-codes model based pattern recognition method is also adaptive to variation of target angles and controllable in error probability. Time-consuming and complicated iterative computation is not necessary in the train process of pattern recognition.

首先建立了雷达目标的高频频率响应方程，这种方程将目标多散射中心理论与目标局部谐振理论有机地结合起来；进而提出了目标多频响应结构成像方法，这种方法将瑞利区频率响应或谐振区频率响应曲线的不同部位用各种不同的近似方法去逼近，通过特征谱估计方法将目标的局部频响特征与宽带距离响应特征结合起来；然后提出了一种基于姿态角变化区域的序贯划分与多模匹配的特征编码识别方法，这种方法具有能适应目标姿态角的变化以及能控制识别的差错概率α等优点，在目标识别时只需要目标在少数有限个频率激励下的幅频响应数据。

After the analysis of the algorithms model of MPEG-2 AAC, the thesis optimizes some blocks with great computation of Psychoacoustic Model, Filter banks and Quantization coding, etc. It omits some function blocks which have much computation and avail little to the gain of coding, for example, prediction in time domain, TNS, etc. It also adopts some fast algorithms to reconstruct some model for the reason of real time characteristic.

在对 MPEG-2 AAC算法模型进行分析之后，对心理声学模型，滤波器组和量化编码模块等计算量较大的模块进行优化，同时也省略了部分运算量大但对编码效果增益不明显的几个模块，如时域预测和 TNS 等，并使用了一些快速计算技术对算法模型进行实时化改造。

Based on this, this project firstly extensively studies, optimizes and ameliorates the key algorithm in coding -DCT and the movement estimation algorithm, so as to implement fast coding and the high compression ratio.

基于此，本课题首先对编码中的关键算法——DCT变换和运动估计算法进行重点研究、优化和改进，以实现快速的编码和高压缩比。

Three commixed still image coding algorithms are proposed based on them and such ideas as: zerotree coding, WMSE (which is based on mankind visual characteristics), classified vector quantization with different vectorstructures and classification methods.

首先回顾了矢量量化的基本原理和一般算法，对小波变换结合矢量量化技术的特点作出分析和总结。

Chapter 5 investigates the CWP-MC-CDMA system performance concatenating with space-time coding and Turbo coding.

论文第五章研究了级联空时编码和Turbo码的CWP-MC-CDMA系统及性能。

Based on this, we employ the Turbo code as channel code, and present a CWP-MC-CDMA system concatenating with space-time coding and Turbo coding, and give corresponding system model and principle analysis.

在此基础上，我们采用Turbo码作为信道编码，提出一种级联空时编码和Turbo码的CWP-MC-CDMA系统，给出相应的系统模型和原理性分析。

Based on the analysis of short-time calm characteristics of audio signal educing from produce-mechanism of audio signal , and the Linear Prediction coding technology , the basic principle of Code-Excited Linear-Prediction coding is discussed .

本文在分析了由语音信号的产生机理所得出的短时平稳特性的基础上，利用线性预测编码技术，分析了码激励线性预测编码的基本原理。

A new Wavelet Image Coding method based on Predictive Quadtree-split is proposed in this paper. This method hybridizes the intra-band and inter-band coding.

1引言小波变换有很强的去相关能力，但各频带内部以及各频带之间的小波系数还存在一定的相关性，如何利用这种相关性是小波变换图像编码的关键。

Huffman coding is the most commonly used to eliminate redundant coding methods are widely used in a variety of data compression technology.

详细说明：哈夫曼编码是消除编码冗余最常用的方法，被广泛应用于各种数据压缩技术。

As for the importance of the distribution of the solutions on the Pareto front, the following measures are introduced in the dissertation: the Niching technique for keeping the genetic diversity and the real coding combining with the average crossover operator for eliminating the so-called"ending effect"of the GAs coding.

求解Pareto波阵面时，解的分布性至关重要，本文从两个角度来提高解的分布性：一是采用小生境技术解决了基因材料多样性损失问题；二是采用常规实数编码配合平均交叉算子解决了端点效应问题。

The changes of the HAF after liver injury may be related to the volume of blood loss, the intraabdominal pressure and the pneumoperitoneum duration.

肝撞击伤伴失血后肝动脉血流量的变化与失血量、气腹压力以及气腹持续时间等有密切联系。

Reneging on our commitments to the world's poor cannot be an austerity measure, she said.

放弃我们给世界上的穷国的承诺不能成为一种紧缩措施。