| 摘要 |
PURPOSE: To obtain a digital sound signal encoding method by which short blocks can be grouped adequately without deteriorating sound quality and a long/short discrimination can be performed even when the sampling frequencies of an input sound signal are different. CONSTITUTION: This device is equipped with a perception entropy calculating means 12 which calculates the perception entropy of the input sound signal calculated by each short conversion block, a perception entropy total calculating means 13 which finds the total of the perception entropy calculated by the calculating means 12 in a frame, a comparing means 14 which compares the absolute value of the difference between the totals of perception entropy in two temporally successive frames with a predetermined threshold, and a long/ short block decision means 15 which decides into which of a long and a short block a block of the input sound signal can be converted according to the comparison result of the comparing means 14.
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