Method and system for speech frame error concealment in...

Details Method and system for speech frame error concealment in... Method and system for speech frame error concealment in...

2005-11-22

2005-11-22

Knepper, David D. (Department: 2654)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C223S073000, C223S073000, C223S073000

Reexamination Certificate

active

06968309

ABSTRACT:
A method and system for concealing errors in one or more bad frames in a speech sequence as part of an encoded bit stream received in a decoder. When the speech sequence is voiced, the LTP-parameters in the bad frames are replaced by the corresponding parameters in the last frame. When the speech sequence is unvoiced, the LTP-parameters in the bad frames are replaced by values calculated based on the LTP history along with an adaptively-limited random term.

REFERENCES:
patent: 5699485 (1997-12-01), Shoham
patent: 6188980 (2001-02-01), Thyssen
patent: 6377915 (2002-04-01), Sasaki
patent: 2002/0052734 (2002-05-01), Unno et al.
patent: 2002/0091523 (2002-07-01), Makinen et al.
Paulus et al. (0-7803-3192-3/96 IEEE, “16 kbit/s wideband speech coding based on unequal subbands”, Acoustic, Speech, and Signal Processing, p. 255-258 vol. 1).
3G TS 26.091 V3.1.0 3rdGeneration Partnership Project; Technical Specification Group Services and System Aspects; Mandatory Speech Codec speech processing functions AMR Speech codec; Error concealment of lost frames.
“Improved substitution for erroneous LTP-parameters in a speech decoder”; J. Makinen et al.; Norsig Symposium 2001; Oct. 18-20, 2001.
3G TS 26.091 v1.0.0 (Apr. 1999) ; 3rd Generation Partnership Project (3GPP) ; TSG-SA Codec Working Group; Mandatory Speech Codec speech processing functions; AMR speech codec; Error concealment of lost frames.

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