共查询到20条相似文献,搜索用时 15 毫秒
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While some original work is presented, this paper is mainly of the nature of a survey of redundancy techniques to date. Several redundancy techniques are described in detail with mathematical models for estimating reliability improvement. The methods are compared on the basis of reliability improvement and general comments are made about applications. The reliability equations for Moore-Shannon, majority, gate connector, and other redundancies, show that Moore-Shannon type of redundancy provides the best reliability improvement An example of a Moore-Shannon redundant flip-flop shows that large reliability improvements are obtained applying redundancy to only the less reliable components, thus keeping the amount of redundancy to a minimum. 相似文献
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目前文本水印算法多基于文本外在特征,很少利用文本内容上的内在关联性,通过对文本句子的主语和宾语进行指代冗余分析,构造用于嵌入水印的指代冗余矩阵,再根据水印信息和矩阵编码规则确定指代冗余矩阵修改位置,利用实体状态编码和状态转移操作修改原文本完成水印嵌入。该算法可以抵抗格式变换、同义词替换等攻击,具有较低的文本修改率和较好的鲁棒性。 相似文献
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Kai Cai Pingyi Fan 《IEEE transactions on information theory / Professional Technical Group on Information Theory》2007,53(2):775-779
In this correspondence, we investigate the link failure problem based on the recent results of network coding. We propose a concept, named capacity factor of a network, which is the minimum link set that can influence the network capacity, as our basic tool. We define the capacity rank to each link of the network to characterize its criticality and present the concept of the p-stable network. Based on these notions, an upper bound for the capacity factor size is derived and a family of p-stable networks is constructed 相似文献
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本文提出一种新的基于神经网络的矢量量化零冗余度信道编码方法,该方法能有效地降低矢量量化编码系统在有噪信道下的平均失真。 相似文献
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数字基带IJF编码及其实现 总被引:5,自引:0,他引:5
IJF编码是将数字基带信号变换成无符号间干扰和抖动的基带波形信号。它具有频谱主瓣窄、滚降速度快的特点。本文给出了一种采用非线性开关滤波器实现IJF编码电路方案 相似文献
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数字音频编码技术的回顾与发展 总被引:3,自引:2,他引:1
介绍了早期的OCF,PXFE,CNET和MUSICAM等编码器,分析了MPEG-4中的两个音频编码器TwinVQ和MPEG-2AAC,对小波在音频编码上的引用也作了阐述。 相似文献
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数字电视信号通过信源编解码技术,经过压缩消去数据冗余,解决了传输的可能性问题,提高信号的抗干扰能力,保证传输信号的可靠性,从而达到在接收端进行判错和纠错的目的,在有限的带宽中提高有效性和可靠性。 相似文献
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在传输有线数字电视信号的过程中,为保证信号正常无误地传送,采用的核心技术就是有线数字电视信道编码技术。在介绍有线数字电视及信道编码的基础上,详细分析讨论了有线数字电视信道编码中的数据随机化、RS编码和卷积交织等技术的原理及其参数的意义。 相似文献
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随着数字技术迅速发展,数字指纹技术也在不断地更新,针对数字指纹编码技术,文章研究了对数字指纹的攻击方式,分析了数字指纹编码的主要算法,并在介绍数字指纹编码发展状况的基础上探讨了数字指纹可能的研究方向。 相似文献
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数字声音压缩编码的进展 总被引:3,自引:0,他引:3
本文描述了用于声音编码的主观听觉模型,介绍MPEG声音编码、DolbyAC-2和AC-3的算法、实时实现的复杂度以及多声道主观测试结果。 相似文献
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简要介绍了数字领域声音的两种编解码方法,即MUSICAM和AC-3的编解码原理,并就此对MUSI—CAM和AC-3进行了比较。 相似文献
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数字图像通信及图像压缩编码的进展 总被引:6,自引:2,他引:4
本文简要综述了各类图像的数字通信及图像压缩编码最近令人瞩目的进展,其中包括静止图像、电视电话/会议电视、常规电视及高清晰度电视。 相似文献
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In earlier publications, we have presented two coding schemes which take into account the conditional statistics of input signals. In the first scheme, the codewords are assigned in such a way as to provide a signal with long runs of zeros and ones. In the second scheme, each picture element is coded by variable-length codewords according to the values of previously transmitted PEL's. In this paper, by providing further results, we examine these coding schemes in greater detail. The performance of both schemes in terms of entropy and bit rate are compared with an optimum predictive coder. The simulation results indicate that these schemes have a significant advantage over standard predictive encoders. Methods to reduce the storage requirement for the encoder and decoder codebooks are also discussed. 相似文献