A frame erasure concealment algorithm based on gain parameter re-estimation for CELP coders

Authors
Citation
Hk. Kim et Hg. Kang, A frame erasure concealment algorithm based on gain parameter re-estimation for CELP coders, IEEE SIG PL, 8(9), 2001, pp. 252-256
Citations number
6
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Eletrical & Eletronics Engineeing
Journal title
IEEE SIGNAL PROCESSING LETTERS
ISSN journal
1070-9908 → ACNP
Volume
8
Issue
9
Year of publication
2001
Pages
252 - 256
Database
ISI
SICI code
1070-9908(200109)8:9<252:AFECAB>2.0.ZU;2-5
Abstract
In this paper, we propose a frame erasure concealment algorithm based on re estimating gain parameters for a code-excited linear prediction (CELP) code r. When a frame is detected as being erased, the coding parameters, especia lly the adaptive codebook gain and fixed codebook gain, of the erased and s ubsequent frames, are reestimated by a gain-matching procedure. By doing th is, we can reduce the abrupt change caused in the decoded excitation signal by a simple scaling down procedure. We have applied this technique to the IS-641 speech coder and found that the proposed algorithm improves the spee ch quality under various channel conditions compared with the conventional extrapolation-based concealment algorithm.