A Novel Approach for Excitation Codebook and Perceptual Weighting Filter Design

Code Excited Linear Prediction (CELP) leads to enhancement over Linear Prediction Coefficient (LPC) coder in terms of decoded speech superiority and the encoded bit rate (4.8Kbps). The proposed work shows the different types of codebooks and their advantages, design, and implementation for the stochastic excitation codebook (ternary codebook) with reduced memory requirement along with an address generator module. A recursive filter namely, perceptual weighting filter is designed to achieve enhanced speech quality with reduced hardware requirements.