Patent ID: 6401062
Filing Date: 2002-06-04
Classification: G10L

Abstract:
A speech and musical signal encoding apparatus, which, when encoding an input signal upon splitting the input signal into a plurality of bands, generates a reconstructed signal by exciting a synthesis filter by a full-band sound source signal, wherein the full-band sound source signal is obtained by summing, over all bands, signals obtained by exciting a higher-order linear prediction filter, wherein the higher-order linear prediction filter represents a fine structure of a spectrum relating to the input signal of each band, by a multipulse sound source signal corresponding to each band, wherein:a residual signal is found by inverse filtering of the reconstructed signal using a linear prediction filter for which linear prediction coefficients obtained from the reconstructed signal have been determined; and orthogonal transform coefficients obtained by converting the residual signal are split into bands, and said higher-order linear prediction filter uses coefficients obtained from a residual signal of each band generated in each band by inverse-converting the orthogonal transform coefficients that have been split into the bands.