Method for packet loss and/or frame erasure concealment in a...

Details Method for packet loss and/or frame erasure concealment in a... Method for packet loss and/or frame erasure concealment in a...

2008-01-29

2008-01-29

Azad, Abul K. (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S500000

Reexamination Certificate

active

07324937

ABSTRACT:
A method for performing packet loss concealment (PLC) and/or frame erasure concealment (FEC) in a speech decoder of a voice communication system. In accordance with the method, if a segment of an encoded speech signal is determined to be bad, an excitation signal is derived by scaling a random sequence of samples, and long-term and short-term predictive parameters are derived based on parameters associated with a previously-decoded segment. The excitation signal is then filtered by a long-term synthesis filter and a short-term synthesis filter under the control of the respective long-term and short-term predictive parameters. If the number of consecutively-received bad segments exceeds a predetermined threshold, the decoded speech signal is gradually reduced.

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European Search issued in European Appl. No. 04025313.0 on Feb. 21, 2005, 3 pages.
Watkins et al., “Improving 16 kb/s G.728 LD-Celp Speech Coder For Frame Erasure Channels,” 1995 International Conference On Acoustics Speech, and Signal Processing, Detroit, MI, May 9-12, 1995, vol. 1, pp. 241-244.

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