Multi-band CELP coding of speech and music
A. Ubale, A. Gersho · 2002
A novel low-delay wideband speech coder, called multi-band CELP (MB-CELP), overcomes the major obstacles usually associated with two traditional CELP approaches to wideband speech coding, namely, fullband CELP and splitband CELP. The new MB-CELP coder employs a multiband bank of off-line filtered excitation codebooks, fullband linear prediction synthesis, and minimization of the error between original and synthesized audio signals over the full frequency range. Two versions of MB-CELP coder at 16 and 24 kbps are described. Subjective comparison test results show that these coders perform better than G.722 coder at 48 and 56 kbps respectively.