| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an acoustic measuring instrument capable of reducing the number of microphones, while solving frequency dependency of a microphone interval. <P>SOLUTION: This acoustic measuring instrument includes a sound receiving part 10 and a computing part 20. The sound receiving part 10 has the plurality of microphones of single directivity. The plurality of microphones of the sound receiving part 10 is arranged to bring the sum of unit vectors directed to the maximum sensitivity direction into zero. The computing part 20 multiplies each unit vector with each of respective measured values of the plurality of microphones, and calculates a particle velocity vector and an acoustic intensity, using vector composition thereof. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
