Perceptual Optimization of Playout Buffer in Voip Applications

Packet delay and loss are two essential problems to real-time voice transmission over IP networks. In the proposed system, the playout delay is adaptively adjusted based on a simplified version of the conversational-quality E-model. Perceptual-based buffer design is formulated as an unconstrained optimization problem leading to a better balance between end-to-end delay and packet loss. Experimental results show that the proposed playout buffer algorithm can achieve the optimum perceived speech quality under various network conditions.

[1]  Wen-Whei Chang,et al.  Spectral and prosodic transformations of hearing-impaired Mandarin speech , 2006, Speech Commun..

[2]  Donald F. Towsley,et al.  Packet audio playout delay adjustment: performance bounds and algorithms , 1998, Multimedia Systems.

[3]  Henning Schulzrinne,et al.  Adaptive playout mechanisms for packetized audio applications in wide-area networks , 1994, Proceedings of INFOCOM '94 Conference on Computer Communications.

[4]  Lingfen Sun,et al.  New models for perceived voice quality prediction and their applications in playout buffer optimization for VoIP networks , 2004, 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577).

[5]  Cormac J. Sreenan,et al.  An adaptive predictor for media playout buffering , 1999, 1999 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings. ICASSP99 (Cat. No.99CH36258).

[6]  JongWon Kim,et al.  Adaptive delay concealment for Internet voice applications with packet based time-scale modification , 2001, 2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.01CH37221).

[7]  Masayuki Murata,et al.  Adaptive Playout Buffer Algorithm for Enhancing Perceived Quality of Streaming Applications , 2004, Telecommun. Syst..

[8]  Luigi Atzori,et al.  Speech playout buffering based on a simplified version of the ITU-T E-model , 2004, IEEE Signal Processing Letters.

[9]  Robert G. Cole,et al.  Voice over IP performance monitoring , 2001, CCRV.

[10]  Masayuki Murata,et al.  Statistical Analysis of Packet Delays in the Internet and Its Application to Playout Control for Streaming Applications , 2001 .