3 Oct
2010
3 Oct
'10
12:32 p.m.
Excerpts from fons's message of 2010-09-30 00:11:32 +0200:
Just as I expected. Hurray for DSP by pictures :)
On Wed, Sep 29, 2010 at 11:33:37PM +0200, Philipp
Überbacher wrote:
Afaik, -3dB == cutoff frequency, at least with those passive electronic
single pole low/highpass filters. So If I understand that and read the
picture correctly, you refer to the frequency range between the cutoff
of the low-band and the lower cutoff of the mid-band, which is about
300Hz, as well as the upper cutoff of the mid-band and the cutoff of the
high-band, which looks even wider to me, about 400Hz.
Those poor notes, if they fall into those holes they'll have a hard time
coming out again :)
I also wonder a bit why the 3kHz dip is at 3.1kHz..
Wow, those dips are pretty deep.. about 25 dB..
In theory they'd go to minus infinity. What is worse is that they
are also quite wide at the -3dB points. Do I
understand your hint correctly when I guess that if you invert the
mid band and add it at the right level the whole thing would end up more
or less flat?
Just inverting it will produce a sum response that is more or less
flat. It will have bumps of a few dB instead of the deep dips, but
this can be corrected to some degree by adjusting the filter params.