23 June 2009
UAM 2009,  Nafplion, Greece
12
Industrial Engineering Dept.
University of Parma – Italy
Advanced Industrial Design in Acoustic
“Passive mode”: DOA estimation
•Analysis was performed in octave bands and the most significant results were obtained in the 4, 8 and 16 kHz bands.
•Confined environment (swimming pool) Ž reflections on the walls.
–Position A: effects noticeable at low frequencies (4 kHz band), a broad lobe is present at around -40°, caused by reflections on the lateral wall. This “false image” disappears with increasing frequency because it increases the array directivity.
–Position B: it is apparent only direct sound, reflections are not appreciable.
The first step of these tests was anali