Differences between version 37 and predecessor to the previous major change of SoundProcessingNotes.
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| Newer page: | version 37 | Last edited on Friday, December 24, 2004 8:13:47 am | by GreigMcGill | Revert |
| Older page: | version 35 | Last edited on Thursday, December 23, 2004 8:00:15 am | by GreigMcGill | Revert |
@@ -1,9 +1,5 @@
-InNeedOfRefactor
-
-!!! Attempt 5
. Finally
-
-Yes
, it's taken
a year to get round
to doing this
.
+This page details the experiences I had in attempting to transfer some aged vinyls to CD for my parents
. This started as a Christmas present for 2003
, and is going to also be
a Christmas present for 2004, as my final attempt was botched last
year. As the real goal is
to transfer a different vinyl altogether, I'll still have
to do that at some point
.
!!! Hardware used
* Athlon 1800+ XP, 512 MB ram, 80 GB IDE disk. Running Gentoo Linux, with the 2.6.9 kernel. NForce2 motherboard.
@@ -22,8 +18,9 @@
* Mute any inputs that aren't being used.
* Keep an eye out for extra sources of noise being added in. The [Linux Audio-Quality HOWTO|http://www.linuxdj.com/audio/quality/] has a few suggestions for taking into consideration here. Worth a read.
* Make lots of backups. Then make some more.
+* If your input starts clipping, you will find it very hard to smooth the sound out. I had better luck recording with low gain and running a software amplify across the track, then declicking/denoising, than I did recording at a higher gain and dealing with clipping audio. It seems the record "clicks" are easy to remove UNLESS they clip, at which point they are tedious to remove.
!! Noise reduction
Audacity and GWC (the Gnome Wave Cleaner) both offer noise reduction tools. I didn't have a lot of luck with Audacity last time I tried it, but that was ages ago and it seems to have advanced a bit. I stuck with GWC however.
@@ -31,9 +28,9 @@
After going through each stage, it makes a lot of sense to back up your current work. It is really annoying to have to sit through another 15 minutes of declicking because you screwed up a decrackle phase and didn't keep your undo information / backups.
! Removing clicks and pops
-GWC has three tools for removing clicks and pops - the strong, weak and manual declick tools. I've seen[1] recommendations to use the strong declick tool several times in a row, and found this to have fairly good results. Depending on how bad your vinyls were, you may have to run this 3 or 4 times.
+GWC has three tools for removing clicks and pops - the strong, weak and manual declick tools. I've seen~
[1] recommendations to use the strong declick tool several times in a row, and found this to have fairly good results. Depending on how bad your vinyls were, you may have to run this 3 or 4 times.
GWC outputs some statistics from its run:
<verbatim>
@@ -48,9 +45,9 @@
</verbatim>
! Removing crackle
-Records have a lot of crackle. Can't get away from it. GWC has a handy tool to remove it. [1] says you should do this, JeffWelty, a wiki visitor who commented on my previous pages, suggested skipping it.
+Records have a lot of crackle. Can't get away from it. GWC has a handy tool to remove it. ~
[1] says you should do this, JeffWelty, a wiki visitor who commented on my previous pages, suggested skipping it.
! Removing other noise.
GWC also has a denoise tool. This is reasonably configurable, with a selection of different algorithms and tunable parameters. Unless you're in a big hurry, you should really play around a bit.
@@ -58,12 +55,21 @@
<verbatim>
DENOISE in 130.549 real seconds
</verbatim>
+!! Amplify and Normalise.
+
+Optional, but amplifying and normalising your final tracks might be useful. It'll stop huge volume disparities when you switch between the latest Wu Tang CD and whatever you just recorded off vinyl, at least.
+
+!! Writing out to CD.
+
+GWC supports track tagging, which is based off waveform amplitude or something. If you get a silent patch, it marks it as a track boundary. I've had mixed success with this, but in my final run I just let it do whatever - I got about three times as many "tracks" as there actually are, but seeing as they are really only a convenience thing I wasn't fussed.
+
+You can either split the file out and write to separate .wav files, or you can write out a cdrdao style TOC file for the .wav, which you can then use to burn to CD later on
!! Sites Referenced.
* http://www.linuxdj.com/audio/quality/
-* [1]http://www.xena.uklinux.net/Linux/audio.html
+* ~
[1]http://www.xena.uklinux.net/Linux/audio.html
* http://linux-sound.org/
* http://magicref.tripod.com/articles/darmp3.htm
* http://freshmeat.net/projects/phonoripper/
* http://panic.et.tudelft.nl/~costar/gramofile/
