Re: Best software for scripted noise reduction, silence trimming, eq and normalization
- From: nospam@xxxxxxxxxx (Don Pearce)
- Date: Tue, 12 Jun 2007 20:37:03 GMT
On Tue, 12 Jun 2007 13:24:03 -0700, mjbaldwin@xxxxxxxxx wrote:
Hi,
I'm new to this group but thought this would be the best place to post
this question. If it's not, could someone please point me to a more
appropriate place?
I have a very specific task I need to complete. I need to take short
home-recorded snippets of spoken noisy audio (i.e. recorded from a
built-in laptop microphone) that begin with 3 seconds of silence, and
do the following to them:
* Delete the initial and last 1/4 sec to remove any click sound from
clicking "record" and "stop" on the computer
* Use the first 2 seconds as a background noise profile
* Remove noise from the recording using the noise profile
* Trim silence including pop-py noise-removal artifacts from the
beginning and end (*not* anywhere in the middle, i.e. pauses in the
speech)
* Apply equalization to restore the initial voice frequency profile
(in my experience, a good bit of the bass of the voice gets removed)
* Normalize the volume, not based on *peak* waveform, but rather on
the *mean* volume of the speaking voice
* Add a small amount of constant background white noise if necessary
to hide remaining noise-removal artifacts
* Make all this automated on my PC so it can be batch-processed
The end result needs to be audio files that can be saved as low-
quality highly-compressed MP3s for sequential playback over the web
(with volume and noise consistent throughout recordings from different
sources, so they can be spliced together and sound like they were
recorded together).
I tried Audacity first, and its noise-removal is not good enough. I've
found Adobe Audition to have much better noise-removal, but I can't
get it to remove silence from just the start and finish (it removes it
from internal pauses, too, which can be longer than the initial or
ending silence), and batch processing still has to be overseen by a
user (i.e. there's no command-line batch script processing).
I could write my own waveform-editing code to take care of the silence-
removal and normalization the way I want them, although it would be a
bit of a pain.
However, I need the noise-removal and equalization done by existing
software. In the end, it's OK if it sounds like 22khz 8-bit audio, as
long as it all sounds consistent without easily heard artifacts.
Is there a software package out there particularly appropriate to my
task? A collection of DirectShow audio filters I could be using
instead of an application? I'd love all the advice I can get on how I
can make this happen.
Thanks
Michael
Wow! That is a really well thought out and posed question.
Unfortunately I don't believe you are going to find an automated
answer to this. I think you will find that you need to intervene
manually to achieve this. Using Audition, you will be amazed how
quickly you can dash through jobs like this once you have your head
round what you are doing.
d
--
Pearce Consulting
http://www.pearce.uk.com
.
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