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Re: Question about In-Ear Microphones

FG-3329 and 3629 are essentially the same, except that the 3629 has leads already attached to it, which saves you the time of having to solder them to the miniature microphone.

Regarding your question about the HRTF's how-to, we give some details in

Grassi E, Tulsi J & Shamma SA (2003) Measurement of Head-Related Transfer Functions based on the Empirical Transfer Function Estimate, in Proc.9th Int. Conf. on Auditory Displays, Boston, MA, pp. 119-122, July 2003.

And, of course there are many other researchers that give details on their HRTF measurements...example:

V. R. Algazi, C. Avendano, D. Thompson (1999). “Dependence of subject and measurement position in binaural signal acquisition”, J. Audio Eng. Soc., 47, 937-947.

but it's far from a complete how-to! I'll be happy to help you filling in some more details though.

Best regards,
-elena


Benjamin, Eric wrote: 
You can do very well using the Knowles FG capsules.  These are hearing
aid capsules that measure 2.5mm X 2.5mm and the FG-3329 and FG-3629
types have a frequency response that is quite flat and very low noise
for the size.  They can be purchased in the US from Digikey
http://www.digikey.com/digihome.html
for US$25.25 in single quantity.  For me, in the US, the Sennheiser
capsules are essentially impossible to obtain.  For you, in the UK, it
may be different.  If I can help out, please feel free to contact me
off-list.

I wonder if anyone has a web page which details the difficulties and the
actual how-to-do-it parts of HRTF measurement?

Eric Benjamin

-----Original Message-----
From: AUDITORY Research in Auditory Perception
[mailto:AUDITORY@xxxxxxxxxxxxxxx] On Behalf Of Martin Ostermayer
Sent: Wednesday, February 01, 2006 5:37 AM
To: AUDITORY@xxxxxxxxxxxxxxx
Subject: Question about In-Ear Microphones

Dear List,

I need to purchase a pair of in-ear microphones for doing HRTF
measurements. I found a couple of threads suggesting the Sennheiser KE 4
to be a suited mic to do the job but the threads were from 1995. So I
was wondering if anybody knew of other (better? cheaper?) alternatives
available nowadays. I also would be thankful for any hint where I can
buy any of them.

Thanks in advance for your help.

Cheers,
Martin Ostermayer



--------------------------------
Martin Ostermayer
RA, School of Psychology
University of Reading
Reading, RG6 6AL, UK

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Elena Grassi, Ph.D.
Perceptual Interfaces and Reality Lab
University of Maryland
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