[sdiy] Filtering for chromatic scale frequencies?

David G Dixon dixon at mail.ubc.ca
Thu May 31 08:53:39 CEST 2018

I'm pretty sure you can filter for frequencies in the harmonic series of a
certain fundamental...?  For example, if you sweep a high-Q bandpass filter
across a sawtooth signal, you should be able to pick out the various
harmonics up to the point where they cease to have any amplitude.  That
probably doesn't help you though.

On the other hand, a bunch of peaky bandpass filters carefully tuned to the
chromatic scale should do what you want somewhat.  Would that be a comb
filter (somebody else here with stronger filter-fu will know the answer).

> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On 
> Behalf Of Mike Beauchamp
> Sent: Wednesday, May 30, 2018 10:49 PM
> To: synth-diy at synth-diy.org
> Subject: [sdiy] Filtering for chromatic scale frequencies?
> This might be bit of a strange one.. I'm wondering if there's 
> any way to filter an audio signal to favour frequencies that 
> are within the chromatic scale?
> So, sort of like "autotune" - but instead of correctively 
> altering the pitch of 'wrong' notes, the filter is just 
> lowering their amplitude significantly.
> Mike
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