DocumentCode :
417132
Title :
On split quantization of LSF parameters
Author :
Nordin, F. ; Eriksson, Thomas
Author_Institution :
Dept. of Commun. Technol., Aalborg Univ., Denmark
Volume :
1
fYear :
2004
fDate :
17-21 May 2004
Abstract :
In this paper we investigate split quantization of the LSF source from an information theoretic perspective. It is a well known fact that split quantization is inferior to unconstrained quantization, due to the independent treatment of sub vectors. Here, we quantify lower bounds for the split loss, and suggest conditional quantization of splits as a method to reduce the losses. The investigation is based on information theoretic estimates of performance, rather than on the performance of actual quantization schemes. Simulations for a 10-dimensional LSF source point at a loss of around 8 bits if scalar quantization is performed, and a loss of approximately 2 bits for a 2-split quantization, both compared to 10 dimensional vector quantization. Furthermore, the results suggest that these losses can be considerably reduced using conditional quantization, down to as low as 0 to 2 bits.
Keywords :
quantisation (signal); speech coding; vocoders; 10-dimensional LSF source point; LSF parameters; conditional quantization; information theoretic estimates; lower bounds; performance; speech coders; split loss; split quantization; Bit rate; Communications technology; Entropy; Estimation theory; Frequency; Linear predictive coding; Mutual information; Random variables; Speech coding; Vector quantization;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2004. Proceedings. (ICASSP '04). IEEE International Conference on
ISSN :
1520-6149
Print_ISBN :
0-7803-8484-9
Type :
conf
DOI :
10.1109/ICASSP.2004.1325946
Filename :
1325946
Link To Document :
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