分组话音通信中分组丢失对汉语话音清晰度的影响

The Effects of Voice Packet Loss on Articulation of Chinese Speech in Packet Voice Communications

分组话音通信中分组丢失对汉语话音质量的影响还未有人研究过。本文给出了在一个令牌总线型话音/数据综合局域网上进行的汉语话音清晰度测试结果。测试结果表明,在收方采用重复丢失前一帧的丢失填补策略下,对于16 kbit/s CVSD编码加静默压缩,以50 ms为话音分组长度的分组话音通信,当分组丢失率达到25％时,汉语话音清晰度的下降不超过3％。

The effects of voice packet loss on articulation of Chinese speech in packet voice communications have not yet been published before. Some experimental results of the project are presented in this paper. The experiments were carried out on an experimental Token-Passing Bus Local Area Network. Voice signals encoded using 16 kbit/s CVSD are packetized with silence detection and transfered on this LAN. The voice packet length is 50ms, and the packet just preceding the lost one is repeated as a substitutionin the receiving end. The most important conclusion obtained is that losing 25% of all packets is tolerablewhile the degradation of articulation of Chinese speech is less than 3%.