[sdiy] Why is Linear FM usually (always?) AC Coupled?

mark verbos markverbos at gmail.com
Tue Feb 4 11:43:38 CET 2020

It does if the modulator waveshape is asymmetrical. AC coupling doesn’t really agree with our perception.


> On Feb 4, 2020, at 11:32 AM, Mattias Rickardsson <mr at analogue.org> wrote:
> Den mån 3 feb. 2020 01:30 <mskala at ansuz.sooke.bc.ca <mailto:mskala at ansuz.sooke.bc.ca>> skrev:
> People think that linear FM doesn't
> shift the perceived pitch, and in order to help with that, it's common to
> make the input AC coupled.
> Intriguing formulation there - do you mean it actually shifts the perceived pitch? :-)
> /mr - I think it can, amplitude does
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