CORRECTING METHOD FOR MICROPHONE OUTPUT FOR SOUND SOURCE SURVEY, LOW-FREQUENCY GENERATING DEVICE, SOUND SOURCE SURVEY SYSTEM, AND MICROPHONE FRAME

摘要

PROBLEM TO BE SOLVED: To provide a sound source survey system securely specifying a noise source even when a low-frequency sound is targeted for measurement. SOLUTION: When microphones M1 to M5 are arrayed to be disposed at respective vertexes of a quadrangular pyramid of a microphone frame 20 and the direction of a sound source is estimated from phase differences of output signals of the respective microphones M1 to M5, data on phase shifts between pairs of microphones (Mi and Mj), which are measured by using a low-frequency generating device are stored in a phase correction file 42n in a data storage means 42a in advance and after the phase shifts among the respective microphones are corrected, the phase differences (time lags Dij) between the respective microphones (Mi, Mj) constituting the microphone pairs are found respectively to estimate the position of the sound source. COPYRIGHT: (C)2007,JPO&INPIT