Patent ID: 6904404
Filing Date: 2005-06-07
Classification: G06Q,G10L

Abstract:
1. An audio signal decoding apparatus for use with a coding apparatus that divides a frequency characteristic signal sequence into plural frequency bands, independently quantizes the divided sequence, calculates quantization errors produced by the respective quantization, and further quantizes the calculated quantization errors in plural stages, wherein the frequency characteristic signal sequence is obtained by subjecting an input audio signal to frequency transformation, and indicates how signal components at a prescribed times are distributed over frequency bands, said audio signal decoding apparatus operable to output a signal corresponding to the original audio signal and comprising: an input part operable to receive a coded signal from the coding apparatus; and an inverse quantization system operable to execute inverse quantization on a plurality of frequency bands within a first stage and to execute inverse quantization on at least one frequency band within a second stage prior to executing inverse quantization on all frequency bands within the first stage.