查询词典 digital coding

along with the development of digital technology,digital filters are widely used in many fields,this paper introduces how to design a iir digital notch filters in matlab environment.the design of digital notch filters can be achieved through three steps:firstly,the design of analog lowpass filter; secondly,it is analog lowpass to analog band stop filter conversion;at last,using the bilinear transformation make the analog notch filters change into digital notch filters.the paper also introduces how to design the transfer function of the digital notch filters using all the zeros and farthest points at the same time,it also introduces the program of the digital notch filters under butterworth analog lowpass prototype.

摘 要：随着数字技术的发展，数字滤波器在许多领域得到广泛的应用。研究一种在matlab语言环境下设计iir数字陷波滤波器的方法，在数字陷波滤波器设计过程中，先进行模拟低通滤波器的设计，然后进行模拟低通/模拟带阻滤波器转换，最后采用双线性变化法将模拟陷波滤波器转化成数字陷波滤波器。提出一种用所有零点和极点来表达数字陷波器传递函数的方法，同时给出以巴特沃斯模拟低通为原型设计数字陷波滤波器的程序。关键词：无限冲激响应；巴特沃斯滤波器；数字陷波滤波器；matlab；双线性变换

Basic image coding VC procedures, including Shannon theorem, Huffman coding, bitplane coding (in accordance with the importance of bit-coding).

详细说明：最基本的图像编码VC程序，包括香农定理、霍夫曼编码、位平面编码(按照比特位的重要性编码)等。

Secondly, the platform of IPTV set-top box named DM6446 is introduced, and then the AVS video coding standard which is implemented as the video coding standard of IPTV is introduced. The kernel architecture, peripheral devices of DM6446 and the key technique of AVS video coding such as transformation, quantization, intra-prediction, inter-prediction, interpolation, and loop filter is introduced in detail. Thirdly, the system procedures of set-top box which are implemented on the ARM side of DM6446 are introduced in detail. This part focuses on the demultiplex of audio and video data, the design of data interface, the playback of audio and video, and the communication between ARM and DSP. Fourthly, the loop filter algorithm of AVS video coding standard is introduced in full detail, and the optimized procedures of the algorithm on the DSP side of DM6446 are introduced, and then the optimized results are presented. Fifthly, the thesis introduces and analyzes the state-of-art technique of deblocking filter, and proposes a deblocking method, and then the results of proposed method are given. Finally, summarize of this thesis and further development is given.

首先对IPTV技术、视频编解码技术以及去块滤波技术做了简要介绍；然后介绍了IPTV机顶盒的实现平台DM6446，并介绍了该处理器的外围接口和内核结构，同时介绍了作为本IPTV系统视频标准的AVS第二部分视频标准，以及该标准中变换量化、帧内预测、帧间预测、插值和环路滤波等多个模块的算法；接着，详细介绍了机顶盒系统相应程序在DM6446 ARM核上的实现，重点介绍了音视频系统码流的解复用、数据接口设计、音视频的播放以及ARM核与DSP核之间的通信；然后，详细介绍了AVS视频标准中环路滤波算法及该算法在DM6446 C64+内核上的优化，并给出优化结果；然后对去块滤波算法进行了研究并提出了一种环路滤波方案，同时给出了此方案的实验结果；最后总结了本文的工作，并提出了可以改进的方向。

Firstly, the research studies the coding rule of the PDF417 barcode and designs related computer code algorithm, with making it programmed, and completes the coding part of the system software. Next, the coding and decoding principle of Reed-Solomon error-correcting code is briefly introduced. According to thecoding and decoding principle in galois field GF(929), to analyze and study its practical application with emphasis in this topic. Then, the PDF417 barcode decoding process is analyzed and studied detailed according to the barcode coding principle, with the corresponding realization method designed, improving the design in theory aspect by using material example, at the same time programming the design method to complete the decoding part of the system. Finally, validated the system program in the practical application of image information aspect, by using the nonrepeatability and the randomicity characteristic of Julia mark shape artwork.

本课题首先研究PDF417条码的编码规则并设计相关的计算机编码算法使其程序化，完成系统软件的编码部分；其次，简要介绍Reed—Solomon错误控制码的编码与译码原理，在伽罗瓦域GF(929)内根据其编译码的原理重点分析与研究其在本课题中的实际应用；然后根据条码的编码原则对PDF417条码的译码过程进行详细的分析与研究，并设计出相应的实现方法，利用具体实例对设计方法进行理论方面的实践同时将设计方法程序化完成系统软件的译码部分；最后利用Julia集分形图形的不可重复性和随机性的特点对系统软件在图像信息方面的实际应用进行了验证。

Three network coding protocols, i.e., non-regenerative network coding protocol, regenerative complex field network coding protocol and regener-ative Galois field network coding protocol are proposed and applied to the multicastnetwork to enhance the throughput.

然后，本文研究了两源、两宿、单中继的协作组播网络，提出了三种网络编码协议，即非再生网络编码(Non-Regenerative NetworkCoding，NRNC)、复数域再生网络编码(Regenerative Complex FiledNetwork Coding，RCNC)和伽罗华域再生网络编码(Regenerative GaloisFiled Network Coding，RGNC)。

3 The inhomogeneity rule-coding and non-coding ORFs differ in inhomogeneity of base composition on three codon positions. By use of inhomogeneity index one can make a distinction between coding (IHI＞14) and non-coding (IHI≤14) ORFs at 95％ accuracy.

遵守这一规则的ORF在酵母基因组中占99.7％。3ORF碱基分布的非均匀规则—ORF的编码能力和密码子三个位点上四种碱基的组成的不均匀性相关。

The choice of the best wavelet bases is one of the subjects attracting more attentions. This paper presents a new choosing method based on numerical analysis. Here the coding performance of wavelet bases is evaluated overall numerically by using several standards, which had been confirmed to be relating to image coding The best chosen wavelet bases fitting static images and video coding are respectively Daubechies's biorthogonal wavelet 9-7 and 5-3, which have been proved by coding experiments.

最佳小波基的选择是倍受关注的问题之一，本文提出一种新的基于数值分析的挑选方法，通过用几个已被证实是与图像编码密切相关的小波基评价标准对小波基的编码性能进行全面的数值评价，并经实际编码检验，选出了适宜静态与活动图像编码的最佳基分别为Daubechies双正交小波9-7与5-3。

Cloning and sequencing of the genes coding a and 3 subunit of phycoerythrin of a red alga-Corallina officinalis are reported firstly(GenBankaccession number: AF510986). The sequence contain 1,140 nucleotide, including 10 nucleotide that locate in the upstream of the initiation codon ofP subunit, 534 coding for P subunit(coding 177 amino acid), 101 nucleotide for gene spacer and 495 nucleotide that draw near the 5 terminal of a subunit(coding 164 amino acid).

首次测定了珊瑚藻藻红蛋白α和β亚基基因的全序列(GenBank登录号：AF510986)，测定的基因序列长为1，140个碱基，包括β亚基起始密码子上游的10个碱基，6亚基编码区的534个碱基(编码177个氨基酸)，101个碱基的间隔区以及α亚基编码区近5'端的495个碱基(编码164个氨基酸)。

Experiments show that rhomb partitioning is more powerful in suppressing block artifacts than square partitioning, results in much higher reconstructed image quality, but takes longer encoding time; 2 For solving exhausting encoding problem of fractal image coding, we present a fast rhomb-partitioning fractal image coding based on neighbor-searching; we present a fast rhomb-partitioning fractal image coding based on block classification; we present a fast square-partitioning fractal image coding based on neighbor-searching, block classification and wavelet transform.

2针对分形图象压缩编码过程非常耗时的致命弱点，提出了基于邻域搜索的菱形块分割的快速分形图象压缩编码方法，提出了基于块分类的菱形块分割的快速分形图象压缩编码方法，提出了基于邻域搜索·块分类和小波变换的方块分割的快速分形图象压缩编码方法，实验结果表明，我们提出的快速分形图象压缩编码与传统的分形图象压缩编码相比，编码速度提高了近40倍。

Microsatellites in various components in Oryza sativa SSP. Japanica were computed and censused. The result showed: Microsatellites distributed in both coding regions and non-coding regions of genes and other regions in rice genome. The only quantitative relationship of microsatellites among regions could be confirmed. In quantitative, microsatellite content in non-coding region is higher than in coding region, but the nature of tri-nucleotide microsatellite excepts. That microsatellites in rice EST sequences are plentiful was found similar to the research before.

对水稻基因组中各成分的微卫星进行统计分析，结果表明：微卫星在基因的编码区和非编码区都有分布，主要是数量上的差异；在数量关系上，非编码区的微卫星含量大大高于编码区，但是三核苷酸微卫星相反；在水稻EST中微卫星含量非常丰富；在微卫星motif长度使用上，二核苷酸微卫星的含量最高，且以at/ta微卫星占大多数；比较籼稻和粳稻基因组上的微卫星，发现它们在含量、组成和motif使用频率上都非常相似。

Many will continue to choose to live in duality and in conflict.

许多人将继续选择活在二元对立性和冲突中。

I find that students of the University of Physical Education all wear sportswear at first sight.

我发现：体育大学的学生乍一看，都是穿运动衣，大家都一样