The application of the IMBE speech coder to mobile communications

Authors:
J. C. Hardwick;J. S. Lim
Affiliations:
Digital Voice Syst. Inc., Cambridge, MA, USA;Digital Voice Syst. Inc., Cambridge, MA, USA
Venue:
ICASSP '91 Proceedings of the Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., 1991 International Conference
Year:
1991

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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.