Subject: Re: Question about In-Ear Microphones From: Elena Grassi <egrassi@xxxxxxxx> Date: Thu, 2 Feb 2006 10:29:59 -0500FG-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@xxxxxxxx On Behalf Of Martin Ostermayer > Sent: Wednesday, February 01, 2006 5:37 AM > To: AUDITORY@xxxxxxxx > 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 > > ----------------------------------------- > This message (including any attachments) may contain confidential > information intended for a specific individual and purpose. If you > are not the intended recipient, delete this message. If you are > not the intended recipient, disclosing, copying, distributing, or > taking any action based on this message is strictly prohibited. > -- Elena Grassi, Ph.D. Perceptual Interfaces and Reality Lab University of Maryland 3355 A. V. Williams Bldg College Park, MD 20742 301-405-2876 (office) 301-314-9920 (fax)