26 Nov
2013
26 Nov
'13
10:57 a.m.
Hello everyone!
Nama has a sort of multiband compressor by using three parallel tracks, all
processed by filters. Now we've discovered, that our current filter settings
aren't good for multiband compression as used in a mastering setup. Yes, I
know, people debate wether to use it or not, but it's always nice to have the
opportunity and leave it up to the users.
We currently use the Glame highpass, lowpass and bandpass IIR LADSPA plugins
with unique IDs 1890-1892. The current settings are:
lowpass: 106Hz 2 stages
bandpass: 520Hz(center) 800Hz(bandwidt) 2 stages
highpass: 1030Hz 2 stages
These settings give a good full band, but I've heard, that the bands aren't
the best choices. I've found some reeferences to using:
160Hz as the first divider and 3500Hz for the second divider.
could someone suggest good settings to achieve this. Either with these
plugins or with different filters, if easily available and in form of a LADSPA
plugin. Ecasound has LV2 support, but it's not capable of all the LV2
features.
I'd also do just fine with a formula to calculate it myself, if there is
such a thing, that really meets the audible requirements.
Fons, last time you were kind enough to supply the settings. How did you
arrive at these values? Did you check graphically? I'm pretty sure, that you
wouldn't have.
Warm regards and thanks a lot
Julien
----------------------------------------
Music, creative writing, technical information:
http://juliencoder.de/
26 Nov
26 Nov
11:27 a.m.
Hello,
as of multiband compresion for mastering purpose, i use 4 bands most
of the time, as the low spectrum needs special attention.
My first consederation based on your frequencies, is they leave
frequency gaps between bands. I couldn't say this is not a way to
work, but i've never seen something like this before. In all my
experiences, either integrated multiband compressors, or parrallel
processed compressors always have crossing frequencies at the -3dB
point.
For example a three band multiband would be : Lowpass>350Hz ,
350Hz>2KHz, 2KHz>Hipass
Then you would adjust the crossover frequencies, compression settings to taste.
For a four band setup, a starting point would be : Lowpass>200Hz ,
200Hz>500Hz, 500Hz>3KHz, 3KHz>Hipass
Raphaël
2013/11/26, Julien Claassen <julien(a)mail.upb.de>de>:
Hello everyone!
Nama has a sort of multiband compressor by using three parallel tracks,
all
processed by filters. Now we've discovered, that our current filter settings
aren't good for multiband compression as used in a mastering setup. Yes, I
know, people debate wether to use it or not, but it's always nice to have
the
opportunity and leave it up to the users.
We currently use the Glame highpass, lowpass and bandpass IIR LADSPA
plugins
with unique IDs 1890-1892. The current settings are:
lowpass: 106Hz 2 stages
bandpass: 520Hz(center) 800Hz(bandwidt) 2 stages
highpass: 1030Hz 2 stages
These settings give a good full band, but I've heard, that the bands
aren't
the best choices. I've found some reeferences to using:
160Hz as the first divider and 3500Hz for the second divider.
could someone suggest good settings to achieve this. Either with these
plugins or with different filters, if easily available and in form of a
LADSPA
plugin. Ecasound has LV2 support, but it's not capable of all the LV2
features.
I'd also do just fine with a formula to calculate it myself, if there is
such a thing, that really meets the audible requirements.
Fons, last time you were kind enough to supply the settings. How did you
arrive at these values? Did you check graphically? I'm pretty sure, that you
wouldn't have.
Warm regards and thanks a lot
Julien
----------------------------------------
Music, creative writing, technical information:
http://juliencoder.de/
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12:58 p.m.
On Tue, Nov 26, 2013 at 11:27:46AM +0100, Raphaël Mouneyres wrote:
as of multiband compresion for mastering purpose, i
use 4 bands most
of the time, as the low spectrum needs special attention.
My first consederation based on your frequencies, is they leave
frequency gaps between bands.
Ha, now I remember what I told Julien - which was exactly to
do that.
Depending on filter type and order, to obtain a flat response
in the crossover region it is not always true that the filters
should cross at the -3 dB points (and hence probably set to
the same frequency). It is true for first order ones. One filter
has +45 degrees phase shift at the nominal frequency, the other
-45. Combining two signals at -3 dB and 90 degrees phase
difference result in 0 dB, as required.
This doesn't work for second order filters. They will have +/-
90 degrees phase shift at the -3dB frequency. If you set both
filters to the same frequency and add the outputs, the region
around that frequency will cancel. If you invert one of the
two, the result will be +3 dB. To get the flattest possible
response in the sum you have to set them to different
frequencies. The result will never be really flat, but you
can come close.
If you want crossovers that exactly add up to a flat response
you need filters like the ones used in zita-lrx.
To answer Julien's question: just preserve the _ratio_ of
the frequencies of the two filters that form a crossover.
Ciao,
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)
1:15 p.m.
Hello Fons!
thanks, that is what I wanted to know. Do you know of any other first order
filter in LADSPA?
Otherwise I'll keep the current filters. They've done fine so far.
Warm regards
Julien
----------------------------------------
Music, creative writing, technical information:
http://juliencoder.de/
12:39 p.m.
On Tue, Nov 26, 2013 at 10:57:39AM +0100, Julien Claassen wrote:
I'd also do just fine with a formula to
calculate it myself, if
there is such a thing, that really meets the audible requirements.
Fons, last time you were kind enough to supply the settings. How
did you arrive at these values? Did you check graphically? I'm
pretty sure, that you wouldn't have.
I don't remember any of this - could you put me back in context ?
And I don't understand your request... Surely the plugins you
use have control ports for the filter frequencies ? So all you
need to do is set those values, but it looks like you're asking
for internal details.
Ciao,
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)
1:03 p.m.
Hello Fons!
I am asking about a setting of those filters to get a frequency spectrum
without holes. The question is, how to adjust the three filters, so that the
"crossfades" between the filters make a relatively flat line in the end.
As I said, the result should be a full band, that can be used to multiband
compress, since there's no direct multiband compressor, that I know off, that
is a LADSPA plugin.
Warm regards and thanks for chiming in
Julien
----------------------------------------
Music, creative writing, technical information:
http://juliencoder.de/
3807
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5 comments
3 participants
participants (3)
-
Fons Adriaensen -
Julien Claassen -
Raphaël Mouneyres