| 摘要 |
PROBLEM TO BE SOLVED: To effectively reduce an influence of an operation sound mixed with an audio signal even when the audio signal itself varies in magnitude. SOLUTION: A signal processing device includes: a signal conversion means of converting a plurality of first audio signals of predetermined time width, obtained by dividing the audio signal comprising a mixture of a target sound and the operation sound and represented with a time function by the predetermined time width, into second audio signals represented with frequency functions; a signal calculating means of finding a third audio signal whose influence of the operation sound is reduced from the second audio signals and an audio signal representing the operation sound; a ratio calculating means of finding the ratio of the magnitude of a reference signal and the magnitude of the third audio signal, the reference signal being an audio signal showing the target sound among a plurality of second audio signals; a correcting means of correcting frequency characteristics of the third audio signal based upon frequency characteristics of the reference signal having been multiplied by the ratio; and a signal inverse transformation means of inverse-transforming the audio signal having been corrected by the correcting means from the audio signal represented with the frequency function into the audio signal represented with the time function. COPYRIGHT: (C)2011,JPO&INPIT
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