A DIGITAL ACOUSTIC SIGNAL CODING APPARATUS A METHOD OF CODING A DIGITAL ACOUSTIC SIGNAL AND A RECORDING MEDIUM FOR RECORDING A PROGRAM OF CODING THE DIGITAL ACOUSTIC SIGNAL

摘要

The present invention provides a digital sound signal encoding method capable of appropriately dividing a short block into groups so that speech quality does not deteriorate in response to a sampling frequency difference of an input sound signal, and simultaneously distinguishing between long and short. The purpose.;Perceptual entropy calculating means for calculating perceptual entropy of the input sound signal calculated for each short transform block, perceptual entropy total calculating means for obtaining the sum in the perceptual entropy frame calculated by the perceptual entropy calculating means, and temporally A comparison means for comparing the absolute value of each total difference in a perceptual entropy frame of two consecutive frames with a predetermined threshold value, and a block of the input sound signal based on the comparison result by the comparison means Long / short block determination means for determining whether or not to convert the data into one.