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Re: Characteristics of a diffuse sound field

It's interesting that you ask the question "what constitutes a 'diffuse sound field' " in terms of how a layman would perceive it.  I've tried getting an answer to that question on a number of occasions, with very little success.  Usually I don't get an answer.  When I do get an answer, it's always couched in terms of light and something on the order of "It means that I can't see the source".  Which is, in fact, a bit helpful.

Have a look at "A simulated diffuse field for in situ microphone measurements"

and further information at:

I've used variations on this technique with good success.  I verify the diffuseness of the generated field by rotating a cardioid microphone through the range of directions and then plotting the polar patterns at various frequencies.

Eric Benjamin

From: Phil McCandless <pmccand@xxxxxxxxx>
To: AUDITORY@xxxxxxxxxxxxxxx
Sent: Thu, January 24, 2013 9:51:17 PM
Subject: Characteristics of a diffuse sound field


I am designing a manikin head for recording and am interested in HRTF's.  I have run into a bit of a shortfall on information relating to what constitutes a "diffuse sound field". 

I would like someone to answer this question from two audience viewpoints....

1) the layman.   How is one to find a suitable "room" for creating a reverberant environment such as a closet, empty classroom, cafeteria, or empty basketball stadium to conduct informal, but effective HRTF studies using manikin dummy models?  

2) the scientist.  What is the definition or characteristics of a truly diffuse sound field useful for experimentation with HRTF's?

Thanks in advance

Phil Mc Cand.le.ss