Title :
Embedded WI coding between 2.0 and 4.8 kbit/s
Author :
Kang, Hong-Goo ; Sen, D.
Author_Institution :
SIPS, AT&T Labs.-Res., Florham Park, NJ, USA
Abstract :
This paper describes an embedded speech coder based on waveform interpolation (WI) techniques. Since the quantization of line spectral frequency (LSF) parameters is fairly orthogonal to the quantization of excitation information, designing an embedded system with WI is much easier than that of other approaches. By using a hierarchical bit-allocation of excitation signals that consist of a slowly evolving waveform (SEW) and a rapidly evolving waveform (REW), the proposed system works well at the bit-rate of 2.0, 2.4, 3.0, 4.0 and 4.8 kbit/s. Listening tests indicate that the performance of the new system is comparable to an optimized fixed-rate WI coder, and the quality degrades gracefully as the bit-rate decreases
Keywords :
interpolation; linear predictive coding; speech coding; vector quantisation; 2 to 4.8 kbit/s; LSF parameters quantization; embedded speech coder; excitation signals; hierarchical bit-allocation; line spectral frequency parameters; listening tests; multistage vector quantization; rapidly evolving waveform; slowly evolving waveform; speech coding; waveform interpolation; Bandwidth; Communication networks; Degradation; Embedded system; Filtering; Interpolation; Scalability; Speech coding; Speech synthesis; System testing;
Conference_Titel :
Speech Coding Proceedings, 1999 IEEE Workshop on
Conference_Location :
Porvoo
Print_ISBN :
0-7803-5651-9
DOI :
10.1109/SCFT.1999.781493
