Packet loss concealment for overlapped transform codecs

Details Packet loss concealment for overlapped transform codecs Packet loss concealment for overlapped transform codecs

2005-06-30

2009-12-01

Han, Qi (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S200000, C704S201000, C704S203000, C704S219000

Reexamination Certificate

active

07627467

ABSTRACT:
Real-time packet-based audio communications over packet-based networks frequently results in the loss of one or more packets during any given communication session. The real-time nature of such communications precludes retransmission of lost packets due to the unacceptable delays that would result. Consequently, packet loss concealment methods are employed to “hide” lost packets from the listener. Unfortunately, conventional loss concealment methods, such as packet repetition or stretch/overlap methods, do not fully exploit information available from partially received samples. Therefore, when a single frame of N coefficients is lost, 2N samples are only partially reconstructed, thereby degrading the reconstructed signal. To address this problem, an optimized packet loss concealment solution is identified for particular lost packets by solving an underdetermined system of linear equations representing partially received samples while minimizing a computed error based on a model of the signal obtained from neighboring blocks or frames received by the decoder.

REFERENCES:
patent: 7356748 (2008-04-01), Taleb
patent: 2002/0007273 (2002-01-01), Chen
patent: 2004/0039464 (2004-02-01), Virolainen et al.
Y. J. Liang, N. Färber, and B. Girod, “Adaptive playout scheduling and loss concealment for voice communication over IP networks,”IEEE Transactions on Multimedia, vol. 5, No. 4, pp. 532-543, Dec. 2003.
R. Ramjee, J. Kurose and D. Towsley, ‘Adaptive playout mechanisms for packetized audio applications in wide-area networks,’ Proc. of INFOCOM'94, vol. 2, pp. 680-688, Jun. 1994.
C. Perkins, O. Hodson, and V. Hardman, “A survey of packet-loss recovery techniques for streaming audio,” IEEE Network Magazine, Sep./Oct. 1998.

Affiliated with

Also associated with

Rating

Packet loss concealment for overlapped transform codecs does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Packet loss concealment for overlapped transform codecs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Packet loss concealment for overlapped transform codecs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4113792