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The effect of moving microphones and rotating diffusers on the variance of decay rate

✍ Scribed by J.L. Davy; I.P. Dunn

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
674 KB
Volume
24
Category
Article
ISSN
0003-682X

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✦ Synopsis

Methods for reducing the uncertamty of standard butldlng acousttcs measurements are of value because they can be used to reduce the ttme requtred to obtam a gtven prectslon tn the measurements Thts paper mvestlgates the use of moving microphones and rotatmg dtffusers to reduce the uncertamty of decay rate or reverberatton ttme measurements m a reverberant room It ts shown that m most sttuattons the ensemble varzance of decay rate obtamed with stattonary mtcrophones and dtffusers is not affected by the use of a moving mtcrophone or a rotatmg dtffuser The reductton m spatial vartance of decay rate caused by a rotatmg dtffuser prevtously reported In the hterature ts observed A movmg mtcrophone reduces the spattal variance at frequencies above 315 Hz A movmg mzcrophone ts not as effecttve as a rotating dtffuser in reducing the spatlal vartance of decay rate 1

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