[LAU] Impulse Response Files for Guitareros

hermann brummer- at web.de
Fri Sep 10 17:36:58 UTC 2010

Am Freitag, den 10.09.2010, 18:29 +0200 schrieb Renato:
> On Fri, 10 Sep 2010 22:49:26 +0800
> Ray Rashif <schivmeister at gmail.com> wrote:
> > On 10 September 2010 22:36, Renato <rennabh at gmail.com> wrote:
> > > As a side note, could someone explain what exactly are IR-files and
> > > how software like guitarix and rakarrack use them to emulate
> > > amps/cabinets/rooms?
> > 
> > http://en.wikipedia.org/wiki/Impulse_response
> > 
> > They are basically audio files, or you can call them "reverberation
> > samples".
> > 
> > If you record the impulse response of a hall, the resulting audio
> > file, when applied programmatically to a signal, will process that
> > signal against the "properties" it had recorded.
> > 
> ok... is it the same for impulse responses of amps/cabinets?

yes, it use the same base  
> then, if I understand correctly, these files are convoluted with the
> signal... this means that the overall effect will be equivalent to a
> specific equalization, or to some type of reverb...or both? 

Yes, depending on the setup to produce the IR file it could included
both. Often you have also some artefacts from the signal witch was used
to produce the IR file, witch wasn't the case with the files I mention
above in this thread. I prefer to talk about a sound colour (in non
technical language). The difference between the plain signal and the
signal send to a amp, Speaker, Hall, Coffee-cup, or what ever you could
imagine. When you search the net about Impulse Response Convolution you
will find crazy stuff. You could use it for match more then plain

> the fact is the wiki talks about "convolution reverb", but I used to
> think that amp emulation was just a matter of equalization

Not only equalization, re/ver/vi/bration takes also a role.
> renato
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