Patent ID: 8600070

Claim:
A signal processing apparatus, comprising: a signal transforming unit transforming a first sound signal for each predetermined time width obtained by dividing a sound signal by the predetermined time width into a second sound signal represented by a frequency function, the sound signal being represented by a time function and in which a target sound and an operation sound are mixed; a calculating unit determining a third sound signal which has a reduced influence of the operation sound by using the second sound signal and a sound signal representing the operation sound; a correcting unit performing a correction, by setting a sound signal representing the target sound among the second sound signal as a reference signal, on a frequency characteristic of the third sound signal based on a frequency characteristic of the reference signal; and a signal inverse transforming unit inverse-transforming a sound signal on which the correction is performed by the correcting unit from the sound signal represented by the frequency function into the sound signal represented by the time function, wherein: the frequency characteristic is a frequency spectrum; and the correcting unit replaces the value of the frequency spectrum of the third sound signal with the value of a corresponding frequency spectrum of the reference signal multiplied by the coefficient when the value of the frequency spectrum of the third sound signal is different from the value of the corresponding frequency spectrum.