In:
Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 140, No. 4_Supplement ( 2016-10-01), p. 3405-3405
Abstract:
Ideal outdoor music hall will be what has invisible but acoustically hard wall. This rather impossible objective can be achieved, at least, in some extent, for example allowing quite acceptable sound level in certain zone or zones where most residence lives and hear unwanted sound. This challenging problem can be tackled by finding the solutions that determines the magnitudes and phases of speakers, which surround the ideal hall's wall, that minimizes acoustic contrast between the listeners zone (bright zone) and residence zone (dark zone). It is interesting to find that acoustic contrast control essentially builds up acoustically hard wall, in other words, it makes large impedance mismatch on the wall. This bright observation, however, has been essentially based on two dimensional simulation and experiment. Next step has to go how well this can be extended to general 3D cases. We attempted to have another layer of speaker arrays, and requiring bright zone inside of the double array with certain height, therefore making a cylindrical volume of bright zone, and dark zone having certain angle, between two lines: one connects between the center and the bottom array and another one is the line between the center and upper array, rotating these two lines makes a diverging volume outside of the wall that has certain angle. Simulations and experiments demonstrated how well it can be practically applied and what are its limitations.
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
2016
detail.hit.zdb_id:
1461063-2
detail.hit.zdb_id:
219231-7
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