Effect of codec bit rate and packet loss on Thai speech recognition over IP
Conference proceedings article
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Publication Details
Author list: Triyason T., Kanthamanon P.
Publisher: Springer Verlag (Germany): Computer Proceedings
Publication year: 2013
Volume number: 409
Start page: 232
End page: 241
Number of pages: 10
ISBN: 9783319037820
ISSN: 1865-0929
Languages: English-Great Britain (EN-GB)
Abstract
Nowadays, VoIP has become the core communications on the internet. One of the crucial applications on VoIP is the automated IVR system that interacts with the user automatically. Speech recognition plays an important role behind this kind of system. This paper studies the effect of codec bit rate and network packet loss on Thai speech recognition systems over an IP network. We encoded the speech samples of male, female and artificial voice with various bit rates of Speex codec. The speech sample was sent by RTP through the IP network with packet loss simulation. The speech quality was measured by PESQ and compared to word error rate of speech recognition. The results show that the codec bit rate and level of packet loss have a significant impact on the performance of speech recognition over IP. ฉ Springer International Publishing Switzerland 2013.
Keywords
PESQ, QoS, Speech recognition, Thai language, VoIP
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