remove silences

[John Landosky]

I'm using a voice recorder to record data hands-free.  I'm generating long audio files which I then need to transcribe.  To shorten the transcription process, I'm trying to use Audacity to delete the silences between numbers before I listen to the files.  I've found "Analyze - Silence finder" and used it to identify zones of silence, but I can't figure out how to then automatically delete those zones.  Is there a way to do this with Audacity?  If not, does anyone have any other suggestions?  Thanks!

- John

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[audacity-help mailing list]

    | From John Landosky
    | Mon, 10 Sep 2007 15:19:57 -0700 (PDT)
    | Subject: [Audacity-help] remove silences
    | I'm using a voice recorder to record data hands-free.  I'm generating
    | long audio files which I then need to transcribe.  To shorten the
    | transcription process, I'm trying to use Audacity to delete the silences
    | between numbers before I listen to the files.  I've found "Analyze -
    | Silence finder" and used it to identify zones of silence, but I can't figure
    | out how to then automatically delete those zones.  Is there a way to do
    | this with Audacity?  If not, does anyone have any other suggestions?

You cannot delete the silences automatically with the 1.2.x series of Audacity,
though of course you can manually do so by zooming in, selecting each silence
and Edit > Delete. The better solution is to use our Beta 1.3.3 version of
Audacity and use Effect > Truncate Silence. Please note if you are on OS X
you need to be on 10.3 or later to use the Beta, and on any operating
system we recommend if you are opening a 1.2.x Project file in the Beta that
to be completely safe you back up the .aup file and _data folder first. Please
set the "Max Silent Duration" in Truncate Silence to to 5 milliseconds or less
(but not to zero as this corrupts the audio) then the remaining silence should
not be audible. Also this feature currently only works on mono tracks. To use it
on a stereo track:

* Click on the track PopDown Menu:
   http://audacity.sourceforge.net/onlinehelp-1.2/menu_track.htm

   and choose "Split Stereo Track"
* Click in the Track Panel of the upper track (above the mute/solo
   buttons) to select all of it, then run Truncate Silence
* Click in the Track Panel of the lower track and similarly run
   Truncate Silence
* Click on the PopDown Menu of the upper track and choose
   "Make Stereo Track".

Truncate Silence will work on stereo tracks in the next versions of Audacity.


Gale Andrews
     


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