標題: Incorporating error shaping technique into LSF vector quantization
作者: Nein, HW
Lin, CT
電控工程研究所
Institute of Electrical and Control Engineering
關鍵字: human perception;quadratically weighted measure;sensitivity matrix;weighted logarithm spectral distortion (WLSD);weighted mean squared error (WMSE)
公開日期: 1-二月-2001
摘要: This paper presents an error shaping technique for line spectrum frequency (LSF) vector quantization, The error shaping technique based on the weighted logarithm spectral distortion (WLSD) measure can be used for shaping the spectral distortion distribution of quantization error into any different curve depending on what kind of weighting function is used. However, the high computational complexity of the WLSD measure deters this error shaping technique from practical use. To solve this problem, we approximate the WLSD measure by the quadratically weighted measure or the weighted mean squared error (WMSE) measure and propose an optimal error shaping technique of LSF vector quantization. In this proposed error shaping technique, the optimal WMSE weights (i.e., the optimal weights of LSF parameters) are determined based on the theoretical analysis of the WLSD measure. Three experiments are performed to check the performance of the proposed error shaping technique. One experiment is set up by incorporating human perception into the LSF quantization and another is set up by emphasizing the human-sensitivity frequency band in lower frequency bandwidth 0-3 kHz. In the third experiment, we apply the proposed error shaping technique to the LSF quantization of a CELP coder to test how it affects the overall speech quality in an actual speech coding algorithm.
URI: http://dx.doi.org/10.1109/89.902275
http://hdl.handle.net/11536/29857
ISSN: 1063-6676
DOI: 10.1109/89.902275
期刊: IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING
Volume: 9
Issue: 2
起始頁: 73
結束頁: 86
顯示於類別:期刊論文


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  1. 000167012000001.pdf