Title :
Improved adaptive CELP coder at 5.2 kbit/s
Author :
Shijun Yang ; Xixian Chen
Author_Institution :
Beijing Univ. of Posts & Telecommun., China
Abstract :
The code-excited linear predictive (CELP) coder is considered to be a good candidate for speech coding at low bit rates. Although the speech quality of this coder is good, certain distortions can still be perceived. In the paper, the authors introduce some procedures to improve the performance of the CELP coder. They improve synthetic speech quality quite a lot both in objective (signal-to-noise ratio) and subjective (listening tests) measures. Experimental results revealed that the proposed CELP coder improved segmental SNR by nearly 3 dB over the conventional CELP coder at 5.2 kbit/s.<>
Keywords :
codecs; linear predictive coding; speech coding; vector quantisation; vocoders; 5.2 kbit/s; code-excited linear predictive coder; distortions; improved adaptive CELP coder; objective measures; performance; speech coding; speech quality; subjective measures; synthetic speech quality; Bit rate; Degradation; Delay; Error correction; Filters; Linear predictive coding; Signal to noise ratio; Speech analysis; Speech coding; Testing;
Conference_Titel :
TENCON '93. Proceedings. Computer, Communication, Control and Power Engineering.1993 IEEE Region 10 Conference on
Conference_Location :
Beijing, China
Print_ISBN :
0-7803-1233-3
DOI :
10.1109/TENCON.1993.327981
