[sdiy] Filtering for chromatic scale frequencies?

[rsdio at audiobanshee.com]

If you want to experiment with these sorts of filter banks without spending a lot of money, then check out the Virta plugin from Madrona Labs. It’s capable of enhancing sounds in quite interesting ways.

Brian Willoughby

Disclaimer: I designed the Soundplane and other hardware for Madrona Labs, so I am affiliated with the company even though I don’t write any of the code for the plugins.


On May 30, 2018, at 11:53 PM, David G Dixon <dixon at mail.ubc.ca> wrote:
> 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-----
>> Sent: Wednesday, May 30, 2018 10:49 PM
>> 
>> 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