[LAU] [Sort of OT] Ringing in filters

[Ken Restivo]

On Wed, May 12, 2010 at 09:44:58PM +0200, Fons Adriaensen wrote:
> On Wed, May 12, 2010 at 11:30:11AM -0700, Ken Restivo wrote:
> 
> > So, are the artifacts caused by the compressors or the EQ?
> 
> The ones I referred to are caused by the FFT-based EQ.
> 
> > I didn't use the EQ on JAMIN at all, just the multiband
> > compressors and the final limiter.
> 
> I don't know if Jamin uses the FFT processing to implement
> the bandsplitting for the multiband compressor.
> 
> If it does then the artefacts of this type of processing
> will show up in the output. 
> 
> If it doesn't, then Jamin needs some type of bandsplitting
> fillters that add up to exactly the input if compressors
> are inactive. I doubt very much if these are implemented
> in Jamin.  
> 

After poking around in JAMIN's source code (gawd I love Free Software, and also being able to code well enough to read the source and get a decent sense of what it is doing), it seems that JAMIN uses an IIR filter to do the crossovers. It seems to be a Butterworth biquad filter. So, since I didn't use the FFT graphical EQ, it's possible that no Ceylons infiltrated my music.

Thanks, and sorry about hijacking the thread.

-ken