Title :
Harmonic vector excitation coding of speech at 2.0 kbps
Author :
Nishiguchi, Masayuki ; Iijima, Kazuyuki ; Matsumoto, Jun
Author_Institution :
Archit. Lab., Sony Corp., Tokyo, Japan
Abstract :
A low rate speech coding algorithm, harmonic vector excitation coding (HVXC) is proposed for MPEG-4 standardization, in which an efficient coding scheme based on harmonic and stochastic vector representation of linear predictive coding (LPC) residuals is employed. A combination of weighted vector quantization of harmonic spectral envelope of LPC residual signal for voiced segments and vector excitation coding for unvoiced segments provides good speech duality at very low bit rates. MPEG-4 formal listening tests in December 95 showed that the subjective speech quality of HVXC at 2.0 kbps was better than that of FS1016 4.8 kbps CELP
Keywords :
code standards; linear predictive coding; spectral analysis; speech coding; speech intelligibility; speech processing; standardisation; telecommunication standards; vector quantisation; 2 kbit/s; 4.8 kbit/s; CELP; FS1016; LPC residual signal; MPEG-4 formal listening tests; MPEG-4 standardization; decoding; harmonic spectral envelope; harmonic vector excitation coding; harmonic vector representation; linear predictive coding; low rate speech coding algorithm; stochastic vector representation; subjective speech quality; unvoiced segments; very low bit rates; voiced segments; weighted vector quantization; Acoustic noise; Bit rate; Decoding; Distortion measurement; Linear predictive coding; MPEG 4 Standard; Shape measurement; Speech coding; Vector quantization; Weight measurement;
Conference_Titel :
Speech Coding For Telecommunications Proceeding, 1997, 1997 IEEE Workshop on
Conference_Location :
Pocono Manor, PA
Print_ISBN :
0-7803-4073-6
DOI :
10.1109/SCFT.1997.623885
