Am 30.01.2011 11:34, schrieb Hartmut Noack:
Am 28.01.2011 13:23, schrieb fons@xxxxxxxxxxxxxxx:
On Fri, Jan 28, 2011 at 01:40:00AM -0500, Michal Seta wrote:
A friend of mine would like to record some impulse response of various
spaces. I don't know the details nor the ultimate goal of this
undertaking
but the problem was about the bst equipment for such recordings. I
know a
loud signal is needed (she has a starter gun for that purpose) but
unclear
about what kind of microphones should be used. Any tips? Ideas?
experiences?
Starter guns, electric sparks, exploding balloons or preservatives,
etc. are not the best way to do this. You get a much more accurate
result and a much better S/N ratio using a sine sweep and deconvolution
instead.
This is true if you want perfectly exact, high fidelity, realistic
response-files of real rooms.
But if you just want files, that produce interesting sounding
reverb-effects, enything that fits, fits.
I use to record rooms using my mobile-phones puny videofunction, the
built-in micro and finger snapping ;-)
Not hi-fi at all and I would distribute these files claiming they would
be something like tools to reproduce the original rooms.
Sorry for being too rash -- of course I would NOT...
But I like,
what I hear, if I load them into a convolver....
Aliki (available on my website) can do this. See
<http://www.kokkinizita.net/papers/aliki.pdf> for an introduction.
The actual application does not have all the features explained in
the paper but it will do the basic IR measurement.
As for the microphones, this depends on the intended use of the
IR. For acoustic analysis you'd use a measurement mic, for reverb
whatever mic type provides the format you require.
Ciao,
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