DocumentCode
3275799
Title
An Enhancement Layer for ACELP Coder
Author
De Meuleneire, M. ; Gartner, Martin ; Schandl, Stefan ; Taddei, Herve
Author_Institution
Siemens CT IC, Munich
fYear
2006
fDate
3-6 Oct. 2006
Firstpage
124
Lastpage
127
Abstract
This paper presents an enhancement layer coming on top of G.729 Annex A codec. This enhancement layer consists of an optimization of the algebraic fixed codebook pulses that were selected by the Annex A codec during the fixed codebook search. The pulses selected by the ACELP codec have all the same absolute amplitude. Our method optimizes each of these amplitudes in order to increase the quality. This is a low-complexity method that allows the introduction of an intermediate bitrate in ACELP-based scalable coder. On top of this pulse optimization method that requires 1.6 kbit/s we introduce a second fixed codebook search with a limited number of pulses (2) and a bitrate of 2.4 kbit/s
Keywords
speech codecs; vocoders; ACELP coder; G.729 annex A codec; algebraic fixed codebook; enhancement layer; Bit rate; Decoding; Optimization methods; Quantization; Speech analysis; Speech codecs; Speech coding; Speech processing; Standardization; Streaming media;
fLanguage
English
Publisher
ieee
Conference_Titel
Multimedia Signal Processing, 2006 IEEE 8th Workshop on
Conference_Location
Victoria, BC
Print_ISBN
0-7803-9751-7
Electronic_ISBN
0-7803-9752-5
Type
conf
DOI
10.1109/MMSP.2006.285281
Filename
4064531
Link To Document