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

fYear

1999

fDate

1999

Firstpage

129

Lastpage

131

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Speech Coding Proceedings, 1999 IEEE Workshop on

Conference_Location

Porvoo

Print_ISBN

0-7803-5651-9

Type

conf

DOI

10.1109/SCFT.1999.781507

Filename

781507