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Title:
HIGHLY ACCURATE SOUND RAY TRACKING DEVICE AND METHOD THEREFOR
Document Type and Number:
Japanese Patent JP3482055
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To realize a high-quality sound field simulation so that unneeded sound rays can be removed when a plurality of sound rays passing through the same reflection path exist.
SOLUTION: The sound ray tracking device judges (S3-S6) if rays enter a sound reception area consisting of a radius (S13 and S14) of a sphere specified by a user or a radius of a sphere calculated from the maximum time for tracking the sound rays specified by the user or an angle step for emitting sound rays (S1 and S2). When the sound rays enter, the area of a sphere with the size of a radius (smaller than the first radius) calculated from a time it takes for reaching from a sound source to the sound receiving area is newly prepared (S7) to judge if sound rays enter the new sound reception area again (S8), thus removing unneeded rays (S9 and S10). Also, the history information of the arriving sound rays is finally compared and another is removed when a sound ray with the same exists (S11).


Inventors:
Ikezawa, Tatsu
Nishi, Takashi
Application Number:
JP1995000325890
Publication Date:
December 22, 2003
Filing Date:
December 14, 1995
Export Citation:
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Assignee:
NIPPON HOSO KYOKAI <NHK>
International Classes:
G01H17/00; G01S5/18; (IPC1-7): G01H17/00; G01S5/18
Other References:
藤原恭司、吉村道彦、増田潔、周期構造壁を持つ室内の音場シミュレーション,日本音響学会誌,1990年12月25日,第47巻、第1号,pp.2−12
藤原恭司、吉村道彦、増田潔、音響計測における確率・統計解析手法−統計手法による室内音場予測,日本音響学会誌,1994年 2月 1日,第50巻、第2号,pp.149−155
Attorney, Agent or Firm:
谷 義一 (外1名)



 
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