The other is the modified hamming bound , also the geometry of the bound is introduced . the fourth chapter is about the linear block codes and their unequal error protection capability 第三章主要证明了两个关于非均匀保护的性能限,这两个性能限不仅对线性码有效,对非线性码同样有效。
Mechanical error protection , the power supply will be cutoff automatically ( to avoid the equipment is burnt ) when the motor fail to work becauseof breakdown or it run continuously more than4 1s 机械故障保护当电机因故障而不能转动或连续运行时间超过4 1秒时,自动切断电源(以免出现烧坏机器的现象) 。
Unequal error protection block codes are investigated in the dissertation . the first chapter is an introduction of the background and history of unequal error protection codes , also the summary of the dissertation is given 第一章简单回顾了非均匀保护编码的历史,对有关的一些理论作了简要的介绍,并且叙述了本文的主要贡献和篇章结构。
Finally , the optimum encoding of an unequal error protection linear code is discussed . turbo codes and their unequal error protection are studied in the fifth chapter . after performance analyzing of turbo codes , the map decoding algorithm and its simulation results are given 第五章是针对turbo码展开的,先给出了turbo码的性能分析,然后讨论了turbo码的map ( maximumapostiori )解码算法,并仿真了map算法的性能。
There are several procedures used to reduce these deteriorating effects , including the use of forward error correction techniques , error concealment methods and error resilience schemes . this paper studies error resilient techniques in internet video transmission . in this techeniques , reed - solomon ( rs ) codes across packets is used for error protection against packet loss , and a self - adaptive error concealment method based on motion feature is proposed , which can conceal errors more effectively , particularly for video sequences with acute motion 本文针对因特网视频传输中的丢包现象进行研究,一方面利用rs编码来提高视频压缩码流抵抗误码的能力;另一方面,提出了一种基于运动特征的自适应误码掩盖方法,能够较好的掩盖视频传输带来的误码,特别对于运动幅度较大的视频序列更能体现出其优势。