Title :
Study and subjective evaluation on MPEG-4 narrowband CELP coding under mobile communication conditions
Author :
Ozawa, Kasunori ; Nomura, Toshiyuki ; Serizawa, Masahiro ; Ehara, Hiroyuki ; Yoshida, Koji ; Tana, N.
Author_Institution :
C&C Media Res. Labs., NEC Corp., Japan
Abstract :
This paper evaluates MPEG-4 narrowband (NB) CELP speech coding under various mobile communication conditions, such as clean, background noise and transmission errors. In order to make the codec robust against the errors with minimum increase of redundant bits, a CRC error correction code is attached into the codec as well as an error concealment is included in the decoder. Subjective evaluation results demonstrate that the speech quality for MPEG-4 speech coding at above 8.3 kb/s is higher than that for the ITU-T G.726 ADPCM at 32 kb/s in the clean speech condition. Further, the speech quality degradation is less than 0.1 in MOS under 10-3 bit error conditions, and still comparable to or higher than that for G.726 at 32 kb/s without error
Keywords :
code standards; decoding; error correction codes; land mobile radio; linear predictive coding; noise; speech codecs; speech coding; speech intelligibility; telecommunication standards; 32 kbit/s; 8.3 kbit/s; CRC error correction code; IMT-2000 mobile communication system; ITU-T G.726 ADPCM; MOS; MPEG-4 narrowband CELP coding; MPEG-4 speech coding; background noise; bit error conditions; clean speech condition; decoder; error concealment; mobile communication conditions; speech codec; speech quality; subjective evaluation; transmission errors; Background noise; Codecs; Error correction codes; MPEG 4 Standard; Mobile communication; Narrowband; Niobium; Noise robustness; Speech analysis; Speech coding;
Conference_Titel :
Speech Coding Proceedings, 1999 IEEE Workshop on
Conference_Location :
Porvoo
Print_ISBN :
0-7803-5651-9
DOI :
10.1109/SCFT.1999.781507
