linuxaudio.org

Excerpts from fons's message of 2010-09-30 00:11:32 +0200:

quoted text
> On Wed, Sep 29, 2010 at 11:33:37PM +0200, Philipp Überbacher wrote:

>

> > 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.

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..
> > Do I understand your hint correctly when I guess that if you invert the

quoted text
> > 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.

Just as I expected. Hurray for DSP by pictures :)
_______________________________________________

Linux-audio-user mailing list

Linux-audio-user@lists.linuxaudio.org

http://lists.linuxaudio.org/listinfo/linux-audio-user