CELP speech coding: comparisons in terms of quantization techniques for the synthesis filter parameters
R. S. Maia, R. J. R. Cirigliano, D. Rojtenberg, F.G.V. Resende · Anais do 2002 International Telecommunications Symposium · 2002
Vector quantization of the synthesis filter parameters in Code-Excited Linear Prediction (CELP) speech coders is a common procedure nowadays.This paper describes a CELP coder implementation and makes a comparison in terms of quality and bit rate when vector and scalar quantization of the synthesis filter parameters are employed.Usage of vector quantization in comparison to scalar quantization allows for a bit rate reduction of 340 bps, giving rise to a 4,06 kbps CELP coder, keeping a similar subjective evaluation.