Automatic Speech Recognition For Voip With Packet Loss Concealment
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Abstract
This paper proposes a packet loss concealment (PLC) technique for increase the robustness of automatic speech recognition (ASR) of speech coded with the G729 codec, on the Voice over Internet Protocol (VoIP). Many of the standard ITU-T CELP based speech coders, such as the G.723.1, G.728, and G.729, model speech reproduction in their decoders. These decoders have enough state information to integrate PLC algorithms directly in the decoder, and are specified as part of their standards in particular by PLC based ITU-T G711 Appendix I. Speech is transmitted with source and channel codes optimized, this channel is simulated by two states Markov model to modeled loss packets. The objective of PLC based ITU-T G711 Appendix I is to generate a synthetic speech signal to cover missing data or loss packets in a received bit stream for the ASR application, i.e., to minimize word error rate.
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References
ITU-T Recommandation G.729, Coding of speech at 8 kbit/s using conjugate-structure algebraic-code-excited linear prediction CS-ACELP ,1996.
H.Yong, Z.Jiang ,Imlementation of ITU-T G729 Speech Code in IP Telephony Gateway ,Wuhan university Journal of natural sciences , vol.5, pp.159-163,2000.
B.Milner ,B, Semmani ,Robust speech Recognition Over Networks, IEEE International Conference Acoustics,Speech , And signal processing, pp.1791-1794, vol.3,2000.
Recommandation UIT-T G.711 , A high quality low-complexity algorithm for packet loss concealment with G.711, September 1999.
J.Wiley , Volp voice and fax signal processing , published simultaneously in Canada ,p.592,2008.
K.Nakamura, An Improvement ofG.711 PLC Using sinusoidal model proceedings of the IEEE The International conference on computer as a toll,pp.1670-1673,2005.
P.C.X. Sommen and J.A.K.S. Jayasinghe, On Frequency Domain Adaptive Filters using the Overlap-add Method , IEEE Philips Research Laboraories,pp.28-30,1988.