DIRECT SOUND EXTRACTION DEVICE AND REVERBERATION SOUND EXTRACTION DEVICE

摘要

PROBLEM TO BE SOLVED: To extract a direct sound or a reverberation sound from a signal in which the reverberation sound is included in the direct sound.

SOLUTION: A direct sound extraction device comprises: spectrum conversion means that converts a Fourier transformation processed input signal into a first amplitude spectrum signal Lfa and a phase spectrum signal; lowpass filter means 4 that generates a second amplitude spectrum signal Lfa1 by performing lowpass filtering processing to the first amplitude spectrum signal Lfa for each frequency using a preset normalization cutoff frequency; first subtraction means 18 that calculates a third amplitude spectrum signal by subtracting the second amplitude spectrum signal Lfa1 from the first amplitude spectrum signal Lfa; and inverse Fourier transformation means that generates a direct sound signal by performing inverse Fourier transformation processing from a frequency spectrum signal calculated on the basis of the phase spectrum signal and the third amplitude spectrum signal.

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