I want to build a very steep, narrow notch filter. Any suggestions
as to how to do this? I've played with [notch] and [biquad~] but
haven't seem to get the results I am looking for.
.hc
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On Thu Aug 17, 2006 at 01:46:35AM -0400, Hans-Christoph Steiner wrote:
I want to build a very steep, narrow notch filter. Any suggestions as to how to do this? I've played with [notch] and [biquad~] but haven't seem to get the results I am looking for.
ive had good results with biquad~ using rbj. you have to chain several of them together on the same frequency though, as each one only takes out 6db or something. its worked quite well to get ridxn of the 19khz stereo tone from FM broadcasts, unwanted resonant frequencies etc.
another good option is FFT
On Thu, 17 Aug 2006, Hans-Christoph Steiner wrote:
I want to build a very steep, narrow notch filter. Any suggestions as to how to do this? I've played with [notch] and [biquad~] but haven't seem to get the results I am looking for.
If you put twice the same filter serially, then the gain for each frequency will be squared (double the decibels). This makes the filter steeper (but not narrower).
_ _ __ ___ _____ ________ _____________ _____________________ ... | Mathieu Bouchard - tél:+1.514.383.3801 - http://artengine.ca/matju | Freelance Digital Arts Engineer, Montréal QC Canada
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Hans-Christoph Steiner -
Mathieu Bouchard