| 摘要 |
<p>PURPOSE:To embody a sound source searching system having higher detection accuracy by providing two scan microphones, one reference microphone, and an operating means for locating a sound source. CONSTITUTION:Scan microphones M1, M2 are arranged with respect to a plane to which a sound source S belongs, i.e., a reproducing plane, and the scan microphones M1, M2 are moved horizontally on front and rear measuring planes MF, MR by means of a microphone traverse system TVS. Sound pressure outputs from the scan microphones M1, M2 and a fixed reference microphone M3 are amplified through amplifiers A1-A3. The sound pressure outputs thus amplified are then subjected to data conversion through A/D converters C1-C3 and further subjected to frequency region conversion through fast Fourier transform units FFT1-FFT3. Acoustic holography operation is then carried out at a holography operating section HD. In other words, the scan microphones M1, M2 are moved in parallel with the sound source S and sound pressure data of one scan microphone is expressed in terms of sound pressure data at the position of the other scan microphone assuming that the sound data has come from the direction of reproducing point and then the difference is subjected to weighting thus obtaining a synthesized sound pressure data. This operation is performed over the entire measuring plane thus locating the sound source.</p> |
