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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
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.
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
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
I wonder if anyone has a web page which details the difficulties and the
actual how-to-do-it parts of HRTF measurement?
From: AUDITORY Research in Auditory Perception
[mailto:AUDITORY@xxxxxxxxxxxxxxx] On Behalf Of Martin Ostermayer
Sent: Wednesday, February 01, 2006 5:37 AM
Subject: Question about In-Ear Microphones
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.
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
3355 A. V. Williams Bldg
College Park, MD 20742
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