Title :
The application of the IMBE speech coder to mobile communications
Author :
Hardwick, John C. ; Lim, Jae S.
Author_Institution :
Digital Voice Syst. Inc., Cambridge, MA, USA
Abstract :
A 6.4 kb/s improved multiband excitation (IMBE) speech coder is presented. This speech coder combines high speech quality with a robustness to channel impairments which is necessary for successful operation in a mobile communication environment. MOS (mean opinion score) results for the IMBE speech coder are compared against those of four 6.4-kb/s CELP (code excited linear prediction) based speech coders which were tested as part of the INMARSAT-M voice codec evaluation. The IMBE system yielded the best performance of the systems tested. It received an MOS score of 3.4 at both 0% and 1% bit error rate. The test results show that the IMBE system is a viable alternative to CELP based speech coders
Keywords :
codecs; encoding; mobile radio systems; speech analysis and processing; 6.4 kbit/s; CELP; IMBE; INMARSAT-M voice codec; code excited linear prediction; improved multiband excitation; mean opinion score; mobile communications; speech coder; Bit error rate; Degradation; Mobile communication; Robustness; Smoothing methods; Speech analysis; Speech codecs; Speech coding; Speech synthesis; System testing;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., 1991 International Conference on
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-0003-3
DOI :
10.1109/ICASSP.1991.150324
