| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide technique capable of correctly and rapidly identifying noises even when the noises are different kinds of aircraft noises. <P>SOLUTION: Noises including a single shot noise and a quasi-stationary noise are detected (S100), and feature amounts indicating the change of the arrival direction of the detected noises are calculated (S200). The calculated feature amounts are smoothed (S300), and candidate points being the points of time when the sound sources of the noises are changed are extracted based on the change qualities of the feature amounts from the smoothed feature amounts (S400). The candidate point close to the single shot noise and the excessively adjacent candidate point are excluded from the extracted candidate points (S500, S600). When the single shot noise exists between the candidate points in a section divided with the remaining candidate points without being excluded, the candidate points on both sides of the single shot noise are determined to be the quasi-stationary noise of the same sound source when correlation in the histogram of azimuth angles of the candidate points on both sides satisfies fixed reference (S700). <P>COPYRIGHT: (C)2013,JPO&INPIT |
