A 16, 24, 32 kbit/s wideband speech codec based on ATCELP

Authors:
P. Combescure;J. Schnitzler;K. Fischer;R. Kircherr;C. Lamblin;A. Le Guyader;D. Massalaux;C. Quinquis;J. Stegmann;P. Vary
Affiliations:
Aachen Univ. of Technol., Germany;-;-;-;-;-;-;-;-;-
Venue:
ICASSP '99 Proceedings of the Acoustics, Speech, and Signal Processing, 1999. on 1999 IEEE International Conference - Volume 01
Year:
1999

Citing 0
Cited 2

A comparative study of LPC parameter representations and quantisation schemes for wideband speech coding

Digital Signal Processing
Improving signal quality of a speech codec using hybrid perceptual-parametric algorithm

International Journal of Intelligent Information and Database Systems

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Abstract

This paper describes a combined adaptive transform codec (ATC) and code-excited linear prediction (CELP) algorithm, called ATCELP, for the compression of wideband (7 kHz) signals. The CELP algorithm applies mainly to speech, whereas the ATC mode is selected for music and noise signals. We propose a switching scheme between CELP and ATC mode and describe a frame erasure concealment technique. Subjective listening tests have shown that the ATCELP codec at bit rates of 16, 24 and 32 kbit/s achieved performances close to those of the CCITT G.722 at 48, 56 and 64 kbit/s, respectively, at most operating conditions.