[music-dsp] Tweakable filters of higher orders?

[Nigel Redmon]

Yes, that is the usual thing to do--higher order filters get too 
sensitive to coefficient precision. Most DSP texts point this out, and 
suggest using series or parallel combinations of lower order filters. I 
wanted to add that--it may or may not be obvious--when you cascade 
several lower order filters, remember that the frequency cutoff moves 
(because it's defined as the -3dB points, and since the cascade changes 
the slope...).


On Sep 28, 2004, at 3:17 PM, Koen Tanghe wrote:

> On Sunday, September 26, 2004 1:46 AM [GMT+1=CET],
> Koen Tanghe <xxxkoen at smartelectronix.comxxx> wrote:
>
>> Can I just use a cascade
>> of multiple identical instances of a biquad to get "sharper" filters? 
>> Or
>> are there any special things to do?
>
> Well, that's what I ended up with for now. Appears to work fine...
> Koen