30 Jan
2011
30 Jan
'11
8:59 p.m.
On 30 January 2011 at 11:43, =?ISO-8859-1?Q?J=F6rn_Nettingsmeier?=
<nettings(a)folkwang-hochschule.de> wrote:
Fabulous.
Whew!
The task I'm starting to plan/attempt is to get my music room treated
and deal with the remaining artifacts with DRC. For a simple room,
e.g. 2 paths from source to listener, I should be able to see the
incident and 2nd path in the impulse response. In that case I can
identify the location of the reflection from the time delay and wall
location. In a more complicated room this might not be intuitive.
I was going to leave it there. But, it should be possible, once a
reflection is identified, to remove it from the impulse response
mathematically, leaving the other reflections, which would then show
up more clearly. I'm not planning to go down that road, just wanting
to understand.
Cheers....
--
Kevin
On 01/30/2011 10:39 AM, Kevin Cosgrove wrote:
Great.
I think I know how to get aliki to create an impulse response.
But, I'm unclear as to how to use that as an input for DRC
(digital room correction).
just export wav files from aliki. I'm also
unclear as to how to use
the impulse response to get at things like RT60, clarity and the
like. I *think* that if I could take the IR out of aliki and
bring it into octave, Maxima, or Matlab, that I could figure it
out from there. From the aliki docs it looks like exporting
of files outside it's initial format is planned, but not yet
implemented. Do I have this right?
no. aliki does wav export just fine. Another thing
I might want to do is to have a look at a time
plot including incident and reflected pulses. The time between
those should be an indicator of the total path length between
the source and the mic. By inspection of the acoustic space,
then I ought to be able to figure out about where reflections
are happening (thinking method of images) in that space and
apply sound treatments accordingly. At least, that's my wistful
hallucination.
no problem there. The pictures
of impulse responses in the various
docs I looked at weren't zoomed in enough for me to really tell
what might be going on, and they were probably of real spaces,
and not simple textbook rectilinear polyhedrons. I wonder, is
aliki a tool that could help in this endeavor, if my idea is
worth attempting at all.
it certainly is. what are you up to? first you mention doing DRC in
actual rooms, last paragraph seems to indicate you want to do some
theoretical stuff? simulations?