NDLI: An adaptive multi rate wideband speech codec with adaptive gain re-quantization

Content Provider	IEEE Xplore Digital Library
Author	Erdmann, C. Vary, P. Fischer, K. Stegmann, J. Quinquis, C. Massaloux, D. Kovesi, B.
Copyright Year	2000
Description	Author affiliation: Tech. Hochschule Aachen, Germany (Erdmann, C.)
Abstract	This paper describes an adaptive multi-rate wideband (AMR-WB) speech codec proposed for the GSM system and also for the evolving third generation (3G) mobile speech services. The coder is a multi rate SB-CELP (subband-code excited linear prediction) with five modes operating at bit rates from 24 kbit/s down to 9.1 kbit/s. Our basic approach consists of an unequal band-splitting of the input signal into two subbands (SB). A variable rate, multi-mode ACELP coder is applied to the lower subband (0-6 kHz). The various bit rates are integrated in a common structure where the scalability is realized by exchanging the fixed excitation codebooks while leaving all other codec parameters invariant. For the GSM related modes (9.1-17.8 kbit/s), the upper subband (6-7 kHz) is coded using a very low bit rate representation based on bandwidth expansion techniques. In case of the 3G application (24 kbit/s) the upper band is coded using a 4 kbit/s ADPCM coding scheme. In addition the analysis by synthesis (AbS) coder of the lower band employs a novel closed loop gain re-quantization technique controlled by the character of the speech signal. Thereby the codec achieves an enhanced performance for background noise while maintaining its clean speech quality.
Starting Page	145
Ending Page	147
File Size	399158
Page Count	3
File Format	PDF
ISBN	0780364163
DOI	10.1109/SCFT.2000.878431
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-09-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wideband Speech codecs Bit rate GSM Speech analysis Speech synthesis Scalability Bandwidth Signal analysis Signal synthesis
Content Type	Text
Resource Type	Article

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