| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a sound gathering device capable of appropriately gathering target area sounds even in the case where there are a plurality of sound sources in a target area.SOLUTION: A sound gathering device 20 comprises a directivity formation part 22 for forming directivity in a target area direction through beamformer (BF) processing with respect to output of a microphone arrays MA1 (main) and MA2 (sub). The sound gathering device also comprises: a propagation delay difference correction part 23 which calculates a ratio of an amplitude spectrum of main BF output in an amplitude spectrum of sub BF output for each frequency, obtains frequency distribution of the calculated ratio, calculates a ratio (peak value) taking a peak of the distribution and, in the case where there are a plurality of peak values, determines a maximum value of the peak values as a correction coefficient; and a target area sound extraction part 26 which obtains noise in the main BF output by performing spectrum subtraction of a correction coefficient multiple of sub BF output from the main BF output and extracts a target area sound by performing spectrum subtraction of weighted noise from the main BF output.</p> |
