Hallo Katja,

Sennheiser works nicely although there is some audible pink noise, i.e., high frequency noise is present. The design of Sennheiser system is superior to Phone-or optical microhone (it was available 10 years ago but I could not find any info now).
http://www.freepatentsonline.com/6618124.html


Standard electret microphones, similar to the standard Elekta intercom microphone, are typically non-magnetic. You would need phantom power, RF filtering, and some manual work and soldering to make it useable in MEG. Anyway, these are low-priced items.

If you need a reasonable option for connecting microphone signals from stimulus cabinet to the outside world, I would recommend optical link, e.g., http://www.thomann.de/de/behringer_ultragain_pro8_digital_ada8000.htm. You would need two of those and fiber optic cables.

Veikko Jousmäki
MEG Core, Aalto NeuroImaging
[log in to unmask]
+358-400952525




Stephen Whitmarsh <[log in to unmask]> kirjoitti 11.12.2013 kello 9.55:

> Hi Katja,
> 
> We went for the Sennheiser SET MO 2000 OPTICAL MICROPHONE and we are really happy with that.
> Comes with an XLR and BNC output (in parallel) so you can feed the signal to the misc/analog input of your MEG system as well as to your speakers and recording equipment.
> 
> Price is about 2 000 EUR, in comparison to the Optoacustics which is about 10 000 USD.
> 
> Cheers,
> Stephen
> 
> NatMEG, Karolinska Institutet, Sweden
> 
> 
> On 11 December 2013 02:18, Tommi Raij <[log in to unmask]> wrote:
> Hi Katja,
> 
> In Boston / MGH Martinos Center we have been quite happy with the
> Sennheiser optical microphone (Sennheiser MO 2000 Set) with our
> VectorView.
> 
> http://www.sennheiserusa.com/professional-optical-microphones-industry-microphones-500488
> 
> Cheers,
> 
> Tommi
> 
> 
> ---
> Tommi Raij, MD, PhD
> TMS Core Director
> MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging
> Bldg 149, 13th St
> Charlestown, MA 02129
> U.S.A.
> 
> 
> 
> > Dear colleagues,
> >
> > does any of you have experience with a fiber optic microphone (built for
> > fMRI) in your MEG laboratory? Maybe with FOMRI-III by Optoacoustics?
> >
> > We would very much appreciate your opinion,
> > best
> > Katja
> >
> > --------------------------------------------------------------------------
> > Dr. Katja Biermann-Ruben
> > Clinical Neuroscience and Medical Psychology
> > Building 23.02, Floor 03, Room 45
> > Heinrich-Heine-University Duesseldorf
> > Universitaetsstrasse 1
> >
> > 40225 Duesseldorf
> > Germany
> > --------------------------------------------------------------------------
> >
> > Tel.: +49 211 - 81 - 12161
> > Fax.: +49 211 - 81 - 13015
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> > [log in to unmask]<mailto:[log in to unmask]>
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> 
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