Abstrakt
Despite the growing importance of packet switching systems, there is still
a shortage of thorough analyses of VoIP transmission effect on speech and
speaker recognition performance. Voice over IP transmission systems use
packet switching. There is no guarantee of delivery. The main disadvantage
of VoIP is a packet loss which has a major impact on the performance
experienced by the users of the network. There are several techniques to
mask the effects of a packet loss, referred to as packet loss concealment.
In this study, the effect of voice transmission over IP on automatic speaker
verification system performance was investigated. The analyzed system was
based on MAP-EM-GMM modelling methods. Four various speech codecs of H.323
standard were investigated with special emphasis placed on the packet loss
phenomenon and various packet loss concealment techniques.
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