Title :
Quantization of SEW and REW components for 3.6 kbit/s coding based on PWI
Author :
Bhaskar, U. ; Nandkumar, S. ; Swaminathan, K. ; Zakaria, G.
Author_Institution :
Hughes Network Syst. Inc., Germantown, MD, USA
Abstract :
The design of a prototype waveform interpolation (PWI) based codec, operating at 3.6 kbit/s, is presented with main focus on the quantization of the slowly evolving waveform (SEW) and rapidly evolving waveform (REW) components. The SEW magnitude component is quantized using a hierarchical mean-shape-gain predictive vector quantization approach. SEW phase is derived using a phase model, based on a measure of voice periodicity. The REW magnitude is quantized using a gain and a sub-band based shape. The REW phase is obtained by high pass filtering a weighted combination of the SEW and a white noise process
Keywords :
filtering theory; interpolation; phase coding; speech codecs; speech coding; vector quantisation; white noise; 3.6 kbit/s; PWI based codec; REW components; REW magnitude; REW phase; SEW components; SEW magnitude; SEW phase; hierarchical mean-shape-gain predictive vector quantization; high pass filtering; prototype waveform interpolation; rapidly evolving waveform; slowly evolving waveform; speech coding; white noise process; Band pass filters; Codecs; Frequency; Interpolation; Linear predictive coding; Low pass filters; Phase measurement; Prototypes; Speech; Vector quantization;
Conference_Titel :
Speech Coding Proceedings, 1999 IEEE Workshop on
Conference_Location :
Porvoo
Print_ISBN :
0-7803-5651-9
DOI :
10.1109/SCFT.1999.781497
