BAND EXTENSION DEVICE AND SOUND CORRECTION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a band extension device capable of improving an auditory recognition degree.

SOLUTION: A band extension device includes: time frame division means for dividing an input signal of a time area for every time frame; Fourier transformation means for performing Fourier transformation to time frames to generate an original sound spectrum of a frequency area; harmonic spectrum generation means for generating a harmonic spectrum based on the original sound spectrum; harmonic spectrum addition means for adding the harmonic spectrum to the original sound spectrum; Fourier inverse transformation means for performing Fourier inverse transformation to the original sound spectrum to which the harmonic spectrum is added to generate output signal components of the time areas; and output signal generation means for adding the output signal components respectively to generate an output signal whose frequency band is extended.

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