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A 16, 24, 32 kbit/s Wideband Speech Codec Based on ATCELP

Authors:

Pierre Combescure, Jürgen Schnitzler, Kyrill Fischer, Ralf Kirchherr, Claude Lamblin, Dominique Massaloux, Alain Massaloux, Catherine Quinquis, Joachim Stegmann, and Peter Vary

Book Title:

Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

Volume:

I

Venue:

Phoenix, Arizona, USA

Date:

Mar. 1999

Pages:

5–8

Language:

English

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.

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