29 Sep
2010
29 Sep
'10
11:33 p.m.
Excerpts from fons's message of 2010-09-29 15:50:43 +0200:
On Wed, Sep 29, 2010 at 06:11:36AM -0700, Patrick
Shirkey wrote:
Wow, those dips are pretty deep.. about 25 dB..
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? I don't know when the actual processing happens, but I
guess if you invert the mid band you will need to handle that a bit
differently as well. Maybe that's all total bollocks though :)
Otherwise in the interests of keeping a
relatively convivial tone I would
like to thank you for spotting the flaws that you have found.
Here's one more:
<http://www.kokkinizita.net/linuxaudio/jamin-iir-xover.png>
This the frequency response (no EQ or whatever) using the IIR crossover,
set to 500 Hz and 3 kHz. Those 'qualitatively more experienced DSP
engineers' don't apparently have the experience to perform even the
simplest of tests. Nor do they know that the type of filter used will
produce antiphase signals at the crossover frequency.
(Hint: invert the mid band).
Ciao,
--
FA
There are three of them, and Alleline.