> Have a look at a couple of recent issues of Circuit Cellar. There are=20
> two projects this year where a dsPic has been used to make an audio=20
> frequency analyser, displaying on a LED bargraph. The most recent one=20
> is a stereo one. These should give you a feel for doing DSP on audio.=20
> I had assistance from a guy to set up a sound system in a church which=20
> was almost a pentagon shape on the ground plan (the sides were not all=20
> equal length) and this created all sorts of echo problems. He used a=20
> similar analyser made out of a number of analogue filters, with about=20
> 5 or 6 channels. We fed a white noise source into the speaker system,=20
> and used a microphone at the normal speaking position fed into the=20
> analyser. The frequency response was then adjusted using the equaliser=20
> on the speaker system so that the displayed frequency response was=20
> flat. It made a big difference to how much level you could before=20
> feedback, as it meant there wasn't a frequency with a highish Q 'hump'=20
> in the response.=20

Cool! I will definitely check that out.

Mark
--=20
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