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

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To: The Linux Audio Developers' Mailing List <linux-audio-dev@...>
Date: Wednesday, October 18, 2006 - 11:21 am

John Rigg wrote:

> On Wed, Oct 18, 2006 at 06:50:39PM +1000, Erik de Castro Lopo wrote:

The aliasing is present for 10s of milliseconds. It blurs into the
instrument attack. Have a look at the attack transient of an acoustic
guitar or a piano. There a bunch of stuff in the first 30 odd
milliseconds that bears no relationship with the fundamental note
frequencey.

> True, but those are removed by the anti-aliasing filters in

I talking about the stuff below half the sample rate.

> > Ok, lets say we're sampling at 44.1kHz, which makes the highest

Thats a bit less than an octave below what I'm talking about.

> Deliberate

I agree completely.

> The fact remains that a lot of high end professional users consider many

I have no problem whatsoever with the possibility that all current free
software compressors are poorly implemented, but that doesn't prove that
its not possible to implement a good compressor without upsampling.

All the best and most famous compressors were implemented using flawed
1960s and 1970s technology. The Joe Meek compressor uses light depend
resistors!!!! In order to make a good digital compressor, we need to
remember that a compressor is lo-tech. Any benchmark DSP implementation
should also be relatively lo-tech. Once you have a good working lo-tech
DSP implementation then you can start looking to improve it using
whatever far out DSP techniques you can think of.

Erik
--
+-----------------------------------------------------------+
Erik de Castro Lopo
+-----------------------------------------------------------+
"Indeed, I am impressed that Google runs an 8,000 node Linux
cluster, 5 data centers, an extensive network, and a rapidly
evolving application all with a staff of 12."
-- http://research.microsoft.com/~gray/papers/FAAMs_HPTS.doc

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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, 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)