[music-dsp] Equalizer

[Jon Watte]

> >Yes, it's typically cheapest done as N parallel bandpass filters with 
> >adjustable gain and very carefully tuned crossover points. 
> 
> Surely not. I would have thought it would be better to use 20 parametric
> eq's (bell filters) in series.

I was thinking 2x10 (for stereo).

Putting 10 filters in series runs the quite significant risk that any 
inadequacy in the filter design (and there will be inadequacies) can 
multiply 10-fold, so I'm not so sure that series is "better".

Also, my claim was for "cheaper". You can clearly run 20 filters in 
5 iterations (using SSE) or 10 iterations (using 3DNow!) when you run 
them in parallel. Not so when you run them in series.

I think this subject, too, should go in the FAQ :-)

Cheers,

			/ h+


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