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语音丢帧补偿算法的评价方法研究

作　者: 杨海松
导　师: 卢晶；林志斌
学　校: 南京大学
专　业: 声学
关键词: Packet loss compensation PESQ Evaluation of speech quality
分类号: TN912.3
类　型: 硕士论文
年　份: 2011年
下　载: 21次
引　用: 0次
阅　读: 论文下载

内容摘要

With the development of telecommunication technology, the quality of multimedia data is getting more and more attention. Voice over IP (VoIP) is the destined trend of speech communication technology; however, it suffers from the delay and packet loss problems caused by the mechanism of Ethernet data transfer. Packet loss compensation (PLC) algorithms become increasingly important in VoIP, which effectively improve the speech quality in bad network conditions. Nevertheless, there is not any efficient method and standard to evaluate the performance of different PLC algorithms.The reconstructed speech quality is the direct manifest of the PLC algorithm. The commonly used speech quality evaluation methods are classified into two categories:objective and subjective test. The subjective test is directly related to the human ear perception, which leads it to the most effective evaluation method. However, it suffers from the big burden of repetitive listening test. The objective test is fulfilled by comparing the original speech signal and the reconstructed speech signal using some psychoacoustic model. It can be easily implemented, but its effectiveness, compared with that of the subject test, is a matter to be concerned.It this thesis, different possible evaluation methods for PLC algorithms are summarized, and an objective test method based on perceptual evaluation of speech quality (PESQ) is proposed. The PESQ value distribution is given based on the evaluation of large data collection. Furthermore, the comparison between the proposed objective test method and the subjective method is conducted, which proves the effectiveness of the proposed objective method. In addition, some description words are summarized from the subjective test to facilitate the improvement of PLC algorithms.

全文目录

英文摘要  2-5
第一章绪论  5-8
  1.1 课题的目的与意义  5-6
  1.2 本文的主要内容  6-8
第二章音频质量的主观测评方法  8-15
  2.1 音频质量主观评测的历史发展与现状  8
  2.2 语音主观测试的常用方法  8-12
  2.3 音频质量的主观评测方法及主观实验要求  12-15
第三章音频质量的客观测评方法  15-25
  3.1 模拟主观评测的音频质量客观测试方法概述  15
  3.2 PESQ原理与实验应用  15-21
    3.2.1 PESQ原理  15-16
    3.2.2 PESQ内部各模块原理  16-21
  3.3 PESQ测量结果的可靠性  21-22
  3.4 PESQ测量的精确度值  22-25
第四章丢帧补偿算法的评价方法及验证  25-34
  4.1 基于E-Model的VolP质量测量方法  25-27
  4.2 实验的前期准备  27-28
  4.3 实验条件与数据分析  28-30
  4.4 置信区间分析  30-31
  4.5 主客观测试相关度分析  31-33
  4.6 丢帧语音的主观特性描述  33-34
第五章总结与展望  34-36
参考文献  36-38
致谢  38-39
研究生期间主要成果  39-40

语音丢帧补偿算法的评价方法研究

内容摘要

全文目录

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