On 2011-05-17 11:19, Mark E. Skeels wrote:
> Olin,
>
> We had talked about using removable acoustic panels of some sort,
> removable just to avoid the possibility of mold forming from the
> moisture, or something like that. That may be the simplest solution,
> overall.
>
> OK, this DSPic thing is kind of a neat and creative idea, and DSP is
> something I am interested in, but haven't really had any time or real
> reason to look at. I have read about it and the things you can do with
> it. It's probably impractical for me to pursue this in reality, but it
> is interesting.


Test it on a PC first, or even implement it there. You can do long FIR=20
filters quite easily in a PC. Getting an external sound interface with=20
XLR jacks will probably go a long way toward making it easier!

see:

http://www.ludd.luth.se/~torger/brutefir.html#good

*http://www.ludd.ltu.se/~torger/filter.html


*



>      * I have a PC program that can measure the "frequency response" of
>        the room. I have used it in the past to detect at what frequencies
>        feedback begins to occur, to help with "ringing out" a system and
>        adjusting the EQ. Maybe another way to approach it is to sweep
>        through the relevant part of the audio band and note the amplitude
>        at various levels?


Is it similar to=20
http://www.duffroomcorrection.com/wiki/Simple_Automated_IR_Measuring_Tool ?

That other approach (sweep) is very often the way it's done as well.

You can compute the response of a modeled room as a starting point.=20
http://www.dspalgorithms.com/room/room25.html


>      * Let's say one wanted to apply some kind of 'impulse" to the
>        room....how could you go about that? Thump on the wall? Run some
>        kind of signal through a speaker or some other kind of transducer?
>        What would be the character of that "impulse" ?
>

Firecracker? Gunshot? ;)


Joe K

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