30 Sep
2010
30 Sep
'10
12:09 a.m.
On Wed, 2010-09-29 at 15:50 +0200, fons(a)kokkinizita.net wrote:
On Wed, Sep 29, 2010 at 06:11:36AM -0700, Patrick
Shirkey wrote:
Fons,
If there is a problem, and you know what it is, and you know how to
fix it, why don't you just fix it? I, for one, bow to your superior
knowledge of DSP - I know jack shit about it (and jack left town).
Steve Harris is apparently too busy to take a look at the problem and
AFAIK Jack O'Quin is the real-time guru. All I am is the graphics code
monkey ;-) How about taking a swing at it?
V/R,
Jan
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).