Method and apparatus for using a waveform segment in place...

Details Method and apparatus for using a waveform segment in place... Method and apparatus for using a waveform segment in place...

2011-01-11

2011-01-11

McFadden, Susan (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

Reexamination Certificate

active

07869992

ABSTRACT:
A method for using a waveform segment in place of a missing portion of an audio waveform generated in response to a packet stream encoding portions of the audio waveform, the method comprising: phase matching a trailing portion of the waveform segment with a trailing portion of the audio waveform that follows the missing portion; and adding the phase matched waveform segment to the audio waveform.

REFERENCES:
“Packet Loss Concealment for Voice Transmission over IP Networks”, Ejaz Mahfuz, Department of Electrical Engineering, McGill University, Montreal, Canada Sep. 2001 (www-mmsp ece.mcgill ca/MMSP/Theses/2001/MahfuzT2001 pdf ).
“A Survery of Packet Loss Recovery Techniques for Streaming Audio”, C Perkins, O. Hodson, V Hardman, University College London, IEEE Network, Sep./Oct. 1998, pp. 40-48.
“Packet Loss Concealment for use with ITU-T Recommendation G 711- T1 521a-2000”: ANSI-American National Standard-Committee T1 Telecommunications-, Supplement to T1 521-1999, prepared by T1A1, Technical Subcommittee on Performance and Signal Processing.
“Packet Loss Concealment for use with ITU-T Recommendation G 711- T1 521 T1 521-1999”, ANSI-American National Standard-Committee T1 Telecommunications, Dec. 1999.
Series G: Transmission Systems and Media, Digital Systems and Networks: Digital transmission systems—Terminal equipments—Coding of analogue signals by pulse code modulation Pulse code modulation (PCM) of voice frequencies Appendix I: “A high quality low-complexity algorithm for packet loss concealment with G 711”, ITU-T Recommendation G 711—Appendix I International Telecommunications Union (ITU-T), 1999.
Algorithms for Sound and Music Computing: Chapter 2, “Sound modeling: signal based approaches” by Giovanni De Poli and Federico Avanzini, 2 1-2 62; 2006.

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