Fourth European Conference on Speech Communication and Technology

Madrid, Spain
September 18-21, 1995

Scalar Quantization of LSF Parameters at 28 bits/frame

H. C. Ng, S. H. Leung

Department of Electronic Engineering, City University of Hong Kong, Hong Kong

Line Spectral Frequencies (LSF) are widely used to quantize spectral information in most of low-bit-rate linear predictive speech coders because of their desirable features with regard to ordering property and spectral sensitivity. Although LSF vector quantizer uses fewer bits [1][2], scalar quantization of LSF [3] is still adopted because codebook storage and computational complexity are the major considerations for real-time implementation. In this paper, a new set of LSF-based coefficients is proposed which can be coded efficiently by increasing the utilization of quantization table. With the novel table search technique based on vector measure, 10th-order LPC parameters can be coded at 28 bits/frame with transparent quantization quality.

Full Paper

Bibliographic reference.  Ng, H. C. / Leung, S. H. (1995): "Scalar quantization of LSF parameters at 28 bits/frame", In EUROSPEECH-1995, 1061-1064.