[LAU] OT - impulse response recording

Hartmut Noack zettberlin at linuxuse.de
Sun Jan 30 12:11:41 UTC 2011


Am 30.01.2011 11:34, schrieb Hartmut Noack:
> Am 28.01.2011 13:23, schrieb fons at kokkinizita.net:
>> 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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