26 Aug
2005
26 Aug
'05
7:41 p.m.
Message: 3
Date: Fri, 26 Aug 2005 11:47:10 -0700
From: Mike Jewell <mj405(a)oneupaudio.com>
Subject: [linux-audio-user] I just want to EQ the quiet parts
To: linux-audio-user(a)music.columbia.edu
Message-ID: <1125082030.31648.30.camel(a)localhost.localdomain>
Content-Type: text/plain
Hi LAUs,
I'm pretty new to all this but have been using Audacity with plugins,
etc and have recently been experimenting with Ardour and Jamin.
What I want to do is EQ the "quiet" parts only of a wav file. The file
is a tape recording of some source (probably LP) done on a cheap
recorder. There is lots of rumble that is mostly noticeable (of course)
in the quieter spots on the track. Playing with Jamin's 30 band EQ
shows that filtering out a band or two around 200 Hz helps a LOT but
this wrecks the bass in the louder "musical" sections.
What I would do is...
Render a couple of versions through Jamin. One with the severe 200hz cut
for the quieter sections, and one with settings that work well on the
louder bits.
Then, line them up in Ardour so they start at exactly the same time and
cut/crossfade between them so the bass cut version is only used where
it's needed.
Longish crossfades should make the changeovers inaudible.
Is there something like a noise gate that, instead of silencing
everything below a certain threshold, would apply a given EQ to it
instead? With all the cool Linux Audio tools out there, it seems like
there must be some way to do this. (Maybe Jamin can and I just don't
see it.)
I guess you could use the spectral gate in freqtweak to do this. It does
tend to change the sound a little (It's not really meant for this kind
of thing) though considering the quality of the source it could well be
acceptable.
Just stay away from the delay, feedback and warp settings or you'll be
playing with it all night... :)
If Jamin had inverse ratios for the compressor sections then you could
do some expansion. Perhaps if you ask the authors they will look into
it?
Thanks,
Mike
Mike Jewell
One-Up Audio