標題: Perceptual quantisation of LPC excitation parameters
作者: Chang, WW
Wang, DY
電信工程研究所
Institute of Communications Engineering
關鍵字: perceptual quantisation;digital audio compression;LPC coder
公開日期: 1-六月-1998
摘要: A new approach to wideband digital audio compression at 64 kbit/s is presented. This LPC coder features a sinusoidal excitation model and adaptive bit-allocation based on a mask-to-noise ratio perceptual measure. Owing to its localised spectral sensitivity, sinusoidal excitation representation can be shown to provide an ideal framework for incorporating an estimated masking threshold in the design of noise spectral shaping. Quantisation of LPC and excitation parameters is also examined. Simulation results indicate that sine waves are preferred to spectrally flat signals for use in excitation modelling, because in the former the estimated masking threshold can be more precisely implemented in the distribution of quantisation noise.
URI: http://hdl.handle.net/11536/32590
ISSN: 1350-245X
期刊: IEE PROCEEDINGS-VISION IMAGE AND SIGNAL PROCESSING
Volume: 145
Issue: 3
起始頁: 155
結束頁: 159
顯示於類別:期刊論文


文件中的檔案:

  1. 000074966600003.pdf