2nd-order allpass VCFs?

Paul Perry pfperry at melbpc.org.au
Tue Nov 23 12:16:40 CET 1999


At 11:31 PM 22/11/99 -0800, Sean Costello  wrote:

>For the "parallel-bandpass filters subtracted from input signal"
>technique to produce really nice notches, I have the feeling that you
>would need filters that can achieve fairly LOW values of Q, as lower Q
>values in the allpass filters tend to produce more prominent sounding
>notches. 

I think this might be dependant on what kind of material is running into
the filter. If the notch is very narrow, it might 'miss' the harmonics of
the input signal. Guitarists are familiar with this from the wah pedals.

paul perry Melbourne Australia




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