Subject: Re: [linux-audio-dev] Equalizer(was Still blabla...) and more
From: Steve Harris (S.W.Harris_AT_ecs.soton.ac.uk)
Date: Fri Dec 21 2001 - 12:24:19 EET
On Thu, Dec 20, 2001 at 09:12:34 +0200, Jussi Laako wrote:
> Alexander Ehlert wrote:
> >
> > That should be way faster than FFT. Using FFT your frequency bands
> > are distributed linear over the frequency range. That is untypical
> > for equalizers anyway, as they always use a logarithmic scale. Which
> > is obvious, because musical harmonies are perceived on a logarithmic
> > scale, f.i. one octave up corresponds to a doubling in frequency.
>
> Yes, this part is the most problematic. I'm still tuning my response
> generation algorithm for the FFT based eq.
My mbeq is FFT based too. I just used the ISO EQ bands (or an
approximation) and interpolated between them to the the amplitudes at each
bin. There is also a variation on the FFT which has logarithmically spaced
bins though, but I didn't think I really needed it.
- Steve
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