[sdiy] SVF High Pass Mode not Cutting Off

[Magnus Danielson]

On 11/04/2011 03:17 PM, Mattias Rickardsson wrote:
> True.
>
> On the other hand though, our hearing is used to acoustic sounds where
> high overtones are already quite weak, and also get dampened further
> by acoustic (HF dampening by distance, reflections, obstruction) and
> psychoacoustic side-effects (masking, and dramatically higher hearing
> threshold towards HF). This makes the raw sawtooth and raw square
> waves sound as sharp as they do compared to real objects. I personally
> experience these raw tones much more as treble than as midrange or
> bass... maybe almost like a further 6dB/oct slope... triangle waves in
> comparison are almost more in line with the "body" of natural sounds.
> Ergo: in sound synthesis, we often start with signals that *already*
> have a high-pass shelving character - which makes further high-pass
> filtering appear more dramatic and further lowpass less dramatic.

Indeed. Agree with all that.

> Speaking of acoustic habits and psychoacoustic side-effects, lowpass
> filtering also appears more natural to our ears, whereas a highpass
> dampening the fundamental and lower overtones in comparison feels
> very, very strange indeed. :-)

So will sharp resonances. They sound interesting and we tune into them. 
Could have something to do with how voices functions. :)

Cheers,
Magnus