NOISE CODE BOOK PREPARATION AND LINEAR PREDICTION CODING/DECODING METHOD USING NOISE CODE BOOK AND APPARATUS THEREFOR

摘要

PURPOSE: A noise code book preparation and a linear prediction coding/decoding method using the noise code book and an apparatus therefor are provided to improve the quality of synthetic speech by extracting a pitch and a formant from a speech to make a pulse train and preparing a noise code book based on the pulse train. CONSTITUTION: A pitch is extracted by using an autocorrelation coefficient of a speech signal in a frame of a predetermined speech signal(501). An LPC(Linear Prediction Coefficient) coefficient representing a present frame is inverse-quantized(502). A formant is obtained from a spectrum based on the LPC coefficient of a speech characteristic parameter representing the frame(503). A speech code book is prepared by generating a pulse train based on the extracted pitch information and formant information(504).