DEVICE AND METHOD FOR CODING DIGITAL ACOUSTIC SIGNALS AND MEDIUM WHICH RECORDS DIGITAL ACOUSTIC SIGNAL CODING PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a device and a method for coding digital acoustic signals in which differences in sampling frequencies of input acoustic signals are responded, short blocks are appropriately divided into groups without deteriorating tone quality and long and short blocks are discriminated. ;SOLUTION: Perception entropy of input acoustic signals computed for every short conversion block is computed (12). Then, a difference between a maximum value and a minimum value of the perception entropy is obtained and the difference and a threshold value determined for every sampling frequency of the signals are compared (14). Based on the comparison result, plural short conversion blocks are divided into groups (15). Then, based on the number of the divided groups, discrimination is made to determine whether a long or a short block is used for the conversion of acoustic signal blocks.;COPYRIGHT: (C)2000,JPO