TIME WARP ACTUATION SIGNAL SUPPLY UNIT, AUDIO SIGNAL ENCODER, METHOD FOR SUPPLYING TIME WARP ACTUATION SIGNAL, METHOD FOR ENCODING AUDIO SIGNAL AND COMPUTER PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a method for improving auditory impression caused by an audio signal encoded based on information available in a time warping type audio signal encoder or decoder.SOLUTION: A time warp actuation signal supply unit 100 for supplying a time warp actuation signal 112 on the basis of expression 110 of an audio signal includes: an energy compression information supply section 120 for supplying energy compression information 122 indicating energy compression in spectral expression after time warp conversion of the audio signal; and a comparison section 130 for comparing the energy compression information 122 with a reference value and supplying the time warp actuation signal 112 depending on the comparison result.