| 摘要 |
<p>A sound determination apparatus (1) receives acoustic signals by a plurality of sound receiving units (13), and generates frames having a predetermined time length. The sound determination apparatus (1) performs FFT on the acoustic signals in frame units, and converts the acoustic signals to a phase spectrum and amplitude spectrum, which are signals on a frequency axis, then calculates the difference at each frequency between the respective acoustic signals as a phase difference, and selects frequencies to be the target of processing. The sound determination apparatus (1) calculates the percentage of frequencies at which the absolute values of the phase differences of the selected frequencies are equal to or greater than a first threshold value, and determines that the acoustic signal coming from the nearest sound source is included in the frame when the calculated percentage is equal to or less than a second threshold value. With the present invention, it is possible to easily identify acoustic signals from the target sound source even in a loud environment, and it is possible to suppress noise.</p> |
