Re: [LAU] OT - impulse response recording

Am 28.01.2011 13:23, schrieb fons@email-addr-hidden:
> 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. 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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Received on Sun Jan 30 16:15:02 2011