Abstract
Efficient representation of LPC excitation signal is of utmost importance in predictive coding systems for achieving high quality speech at low bit rates. In this paper, we present a method for obtaining an efficient parametric representation of the LPC excitation signal for voiced speech in the frequency domain that takes advantage of the nonuniform spacing of critical bands [1] in the auditory system. In current analysis/synthesis systems [2,3], a significant portion of the available bits is used to represent the excitation signal in order to reproduce its detailed structure which is very complicated. The method presented in this paper aims to preserve only those details in the LPC excitation signal which are necessary to produce synthetic speech without audible distortion.
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