Re: [linux-audio-dev] Paper on dynamic range compression

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To: The Linux Audio Developers' Mailing List <linux-audio-dev@...>
Date: Thursday, October 5, 2006 - 10:48 am

Some additional nit-picks:

"these models are as closed and unknown as their analog originals"

Analog equipment is very rarely closed and unknown, as anyone who
understands electronics can usually look at the circuitry and work out what
it does. Sometimes a manufacturer will encapsulate circuits in resin
or use custom ICs to prevent copying, but that was pretty rare when most
of the `classic' analog compressors were designed.

"If a compressor had a knee setting, relevant settings were chosen"

What is a relevant setting?

"lower frequencies tended to be less attenuated, while DC offsets tended
to be the most attenuated. This seems to point that all plug-ins tested
use some form of RMS or integration method."

This doesn't follow. Most compressors do indeed use some form
of integration, but that's not the reason for these effects.
The lesser attenuation of lower frequencies points to high pass
filtering in the signal used for envelope tracking, and the greater
attenuation of DC offset is likely due to high pass filtering in the
audio path (analogous to DC blocking capacitors in a hardware compressor).

John

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Messages in current thread:
[linux-audio-dev] Paper on dynamic range compression, Andres Cabrera, (Thu Oct 5, 3:50 am)
Re: [linux-audio-dev] Paper on dynamic range compression, Alfons Adriaensen, (Thu Oct 5, 8:46 am)
Re: [linux-audio-dev] Paper on dynamic range compression, Andres Cabrera, (Thu Oct 5, 1:44 pm)
Re: [linux-audio-dev] Paper on dynamic range compression, John Rigg, (Thu Oct 5, 10:48 am)
Re: [linux-audio-dev] Paper on dynamic range compression, Andres Cabrera, (Thu Oct 5, 2:01 pm)
Re: [linux-audio-dev] Paper on dynamic range compression, Andres Cabrera, (Fri Oct 6, 2:25 am)
Re: [linux-audio-dev] Paper on dynamic range compression, Andres Cabrera, (Thu Oct 5, 2:14 pm)
Re: [linux-audio-dev] Paper on dynamic range compression, Alfons Adriaensen, (Thu Oct 5, 3:29 pm)
Re: [linux-audio-dev] Paper on dynamic range compression, Andres Cabrera, (Fri Oct 6, 2:48 am)
Re: [linux-audio-dev] Paper on dynamic range compression, Fons Adriaensen, (Thu Oct 5, 5:05 pm)
Re: [linux-audio-dev] Paper on dynamic range compression, Erik de Castro Lopo, (Tue Oct 17, 9:18 pm)
Re: [linux-audio-dev] Paper on dynamic range compression, Erik de Castro Lopo, (Tue Oct 17, 10:28 pm)
Re: [linux-audio-dev] Paper on dynamic range compression, Jens M Andreasen, (Wed Oct 18, 5:23 am)
Re: [linux-audio-dev] Paper on dynamic range compression, Erik de Castro Lopo, (Wed Oct 18, 8:50 am)
Re: [linux-audio-dev] Paper on dynamic range compression, Fons Adriaensen, (Wed Oct 18, 11:33 am)
Re: [linux-audio-dev] Paper on dynamic range compression, Fons Adriaensen, (Wed Oct 18, 4:35 pm)
Re: [linux-audio-dev] Paper on dynamic range compression, Erik de Castro Lopo, (Wed Oct 18, 11:21 am)
Re: [linux-audio-dev] Paper on dynamic range compression, Steve Harris, (Wed Oct 18, 11:08 am)
Re: [linux-audio-dev] Paper on dynamic range compression, Steve Harris, (Wed Oct 18, 10:42 am)
Re: [linux-audio-dev] Paper on dynamic range compression, Paul Winkler, (Tue Oct 17, 11:00 pm)
Re: [linux-audio-dev] Paper on dynamic range compression, Steve Harris, (Wed Oct 18, 10:58 am)
Re: [linux-audio-dev] Paper on dynamic range compression, Fons Adriaensen, (Tue Oct 17, 9:54 am)
Re: [linux-audio-dev] Paper on dynamic range compression, Fons Adriaensen, (Tue Oct 17, 2:41 pm)
Re: [linux-audio-dev] Paper on dynamic range compression, David Olofson, (Tue Oct 17, 4:51 pm)
Re: [linux-audio-dev] Paper on dynamic range compression, Fons Adriaensen, (Tue Oct 17, 5:05 pm)
Re: [linux-audio-dev] Paper on dynamic range compression, Dominique Michel, (Wed Oct 18, 3:40 pm)
Re: [linux-audio-dev] Paper on dynamic range compression, Steve Harris, (Wed Oct 18, 10:54 am)
Re: [linux-audio-dev] Paper on dynamic range compression, Steve Harris, (Tue Oct 17, 12:06 pm)
Re: [linux-audio-dev] Paper on dynamic range compression, Alfons Adriaensen, (Fri Oct 6, 9:00 am)
Re: [linux-audio-dev] Paper on dynamic range compression, Alfons Adriaensen, (Thu Oct 5, 2:22 pm)
Re: [linux-audio-dev] Paper on dynamic range compression, Andres Cabrera, (Fri Oct 6, 3:47 am)
Re: [linux-audio-dev] Paper on dynamic range compression, Andres Cabrera, (Fri Oct 6, 2:31 pm)