PACELP: a high quality and low complexity scheme for narrow band coding of speech

The paper proposes a new Pulse Adaptive Code-Excited Linear Predictive (PACELP) speech coding algorithm. The optimal excitation search procedures become simple when the pulse adaptive method is used in matching the codebook. The codebook of PACELP is obtained from Regular-Pulse Excitation sequences using a varying threshold clustering algorithm. The codebook efficiency is 4 times as much as the basic CELP codebook, and its dimensions are reduced from 40 to 10. Finally computer simulation results show that at 4.8 kb/s, PACELP can produce a clear and natural-sounding synthetic speech.<
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