10 May
2008
10 May
'08
11:29 a.m.
Hi, I'm recording some of my cassettes and lp's and would like
advice for testing the recording quality.
First, how would you recommend testing for proper gain?
I want to re-record if there is clipping.
Second, sometimes there are skips or scratches or
computer-related glitches which can be fixed by re-recording.
Especially I would like a method of recording twice, and
comparing the results to detect these problems.
Thanks for your help!
Greg Sharp
gregsharp(a)geocities.com
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10 May
10 May
11:41 a.m.
Hello!
I can only reliably comment on one aspect: Clipping and volume:
ecasound -i input.wav -o null -ev
Will give a long statistic and the last line of that says something like:
(audiofx) Max gain without clipping, all: 1.69677.
that means with:
ecasound -i input.wav -o output.wav -ea:169.677
you can amplify your file to full volume without having clipping.
You could alternatively use some normalising software like:
ecanormalize input.wav
If it tells you the the file is already normalised, it means (in 99 of 100
cases), that there is clipping.
Other interactive ways might be some graphical analysing software, take a
look at linuxaudio.org or at Dave's page linux-sound.org, they should list
enough software in this field.
For glitches I don't know, listen, perhaps some fft-based piece of software
exists, which could find possible glitches, by finding "broken waves", with
methods of mathematical analysis.
HTH.
Kindest regards
Julien
--------
Music was my first love and it will be my last (John Miles)
======== FIND MY WEB-PROJECT AT: ========
http://ltsb.sourceforge.net
the Linux TextBased Studio guide
======= AND MY PERSONAL PAGES AT: =======
http://www.juliencoder.de
12:13 p.m.
On Sat, May 10, 2008 at 6:41 AM, Julien Claassen <julien(a)c-lab.de> wrote:
Hello!
I can only reliably comment on one aspect: Clipping and volume:
ecasound -i input.wav -o null -ev
Will give a long statistic and the last line of that says something like:
(audiofx) Max gain without clipping, all: 1.69677.
that means with:
ecasound -i input.wav -o output.wav -ea:169.677
you can amplify your file to full volume without having clipping.
You could alternatively use some normalising software like:
ecanormalize input.wav
If it tells you the the file is already normalised, it means (in 99 of 100
cases), that there is clipping.
Other interactive ways might be some graphical analysing software, take a
look at linuxaudio.org or at Dave's page linux-sound.org, they should list
enough software in this field.
For glitches I don't know, listen, perhaps some fft-based piece of software
exists, which could find possible glitches, by finding "broken waves", with
methods of mathematical analysis.
HTH.
Kindest regards
Julien
--------
Music was my first love and it will be my last (John Miles)
======== FIND MY WEB-PROJECT AT: ========
http://ltsb.sourceforge.net
the Linux TextBased Studio guide
======= AND MY PERSONAL PAGES AT: =======
http://www.juliencoder.de
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Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
For software caused glitches: ardour has an option to stop recording
if jack has an xrun (an xrun being the most likely kind of software
glitch). I would turn this option on when recording, and if a track is
interrupted in the middle somewhere, re-record starting at that track.
For post-production mastering (which you need to get the most out of
your raw recorded material) there is jamin, but how to do
post-production mastering is a bit too big a topic for an email (as I
understand it, there are plenty of folks out there which will offer
you multiple-year courses in the subject for a considerable fee).
8:59 p.m.
Gregory Sharp wrote:
Hi, I'm recording some of my cassettes and
lp's and would like
advice for testing the recording quality.
First, how would you recommend testing for proper gain?
I want to re-record if there is clipping.
hi, Gregory. What software are you recording with?
I found audacity to be good for this job. You can record with a nice bit
of headroom (peak-holding meters are provided), and then use the
built-in 'amplify' effect to get maximum volume without clipping.
Second, sometimes there are skips or scratches or
computer-related glitches which can be fixed by re-recording.
Gnome_wave_cleaner (GWC) is good at removing pops and crackles,
processing the whole file in one go.
Audacity has facilities for repairing localised glitches.
Especially I would like a method of recording twice,
and
comparing the results to detect these problems.
I don't know how you would do this. I wish I did! I recently had a
session recording some vinyl LPs. Despite some serious head-scratching I
could not think of a quick and easy, semi-automated method.
I simply ran my recordings through GWC on a non-aggressive setting,
listened to the results and ran GWC again or fixed them by hand.
This took some time. I guess I can appreciate your motivation for
posting :-)
... any one got any bright ideas?
yours, G.
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3 comments
4 participants
participants (4)
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garryo -
Gregory Sharp -
Julien Claassen -
Justin Smith