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A modified CS-ACELP algorithm for variable-rate speech coding robust in noisy environments

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1 Author(s)
F. Beritelli ; Ist. di Inf. e Telecommun., Catania Univ., Italy

This letter deals with a variable bit-rate CS-ACELP speech coder based on new algorithms that are robust in the presence of the background noise typical of wireless communications. The coder presents eight operating modes ranging from 0-8 kbit/s with an average bit-rate of about 4 kbit/s. Subjective and objective comparisons with the recent ITU-T G.729 8 kbit/s standard, used in the discontinuous transmission mode, demonstrate that the proposed coder provides an average bit rate reduction of about 20% maintaining the same algorithmic delay and perceptive quality.

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IEEE Signal Processing Letters  (Volume:6 ,  Issue: 2 )