LEVEL DIFFERENCE CORRECTION DEVICE, LEVEL DIFFERENCE CORRECTION METHOD, LEVEL DIFFERENCE CORRECTION PROGRAM, AND RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To implement stable level difference correction.SOLUTION: A level difference correction device is configured to perform level difference correction on multiple acoustic signals collected by multiple microphones. The level difference correction device comprises a low-pass filter, a low frequency time average power calculation part, a power ratio calculation part and a gain adjustment part. The low-pass filter passes only a signal in a predetermined low frequency for each acoustic signal and outputs multiple low frequency acoustic signals. The low frequency time average power calculation part calculates low frequency time average power that is time average power for each low frequency acoustic signal. The power ratio calculation part calculates a ratio with respect to reference power that is calculated from the low frequency time average power by predetermined means, for each of low frequency time average power and defines a result of the calculation as a power ratio. The gain adjustment part adjusts a gain for each acoustic signal based on the power ratio.SELECTED DRAWING: Figure 1