Bilateral Waveform Similarity Overlap-and-Add Based Packet Loss Concealment for Voice over IP

 

J.F. Yeh*¹, P.C. Lin², M.D. Kuo^1,3, Z.H. Hsu¹

 

¹ Department of Computer Science and Information Engineering, National Chiayi University, Taiwan. (R.O.C.). *ralph@mail.ncyu.edu.tw.

² Department of Computer Science and Information Engineering.

³ Department of Digital Design and Management, Far East University, Taiwan (R.O.C.).

 

ABSTRACT

This paper invested a bilateral waveform similarity overlap-and-add algorithm for voice packet lost. Since Packet lost will cause the semantic misunderstanding, it has become one of the most essential problems in speech communication. This investment is based on waveform similarity measure using overlap-and-Add algorithm and provides the bilateral information to enhance the speech signal reconstruction. Traditionally, it has been improved that waveform similarity overlap-and-add (WSOLA) technique is an effective algorithm to deal with packet loss concealment (PLC) for real-time time communication. WSOLA algorithm is widely applied to deal with the length adaptation and packet loss concealment of speech signal. Time scale modification of audio signal is one of the most essential research topics in data communication, especially in voice of IP (VoIP). Herein, the proposed the bilateral WSOLA (BWSOLA) that is derived from WSOLA. Instead of only exploitation one direction speech data, the proposed method will reconstruct the lost voice data according to the preceding and cascading data. The related algorithms have been developed to achieve the optimal reconstructing estimation. The experimental results show that the quality of the reconstructed speech signal of the bilateral WSOLA is much better compared to the standard WSOLA and GWSOLA on different packet loss rate and length using the metrics PESQ and MOS. The significant improvement is obtained by bilateral information and proposed method. The proposed bilateral waveform similarity overlap-and-add (BWSOLA) outperforms the traditional approaches especially in the long duration data loss.

Keywords: Packet loss concealment, waveform similarity overlap-and-add, VoIP, speech communication.

 

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