4th International Conference on Spoken Language Processing
Philadelphia, PA, USA
In this paper, an algorithm for coding 20 Hz - 15 kHz speech signals at 64 kbit/s with a very low delay (frame of 0.16 ms) is presented. To achieve a quality near to transparency, we propose adapting the Low-Delay CELP coder  to the 15 kHz bandwidth and suggest a new noise shaping method based on a psycho-acoustic model. In this way we take advantage of linear predictive coding and masking properties of the human perception system. Finally, an algebraic codebook is proposed, allowing an important reduction of coder computational complexity, without decreasing the perceived quality of signals.
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Bibliographic reference. Murgia, C. / Feng, G. / Guyader, A. Le / Quinquis, C. (1996): "Very low delay and high quality coding of 20 hz-15 khz speech signals at 64 kbit/s", In ICSLP-1996, 302-305.