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Eliminating hum on a recording

 
 
flyn
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      01-20-2006, 03:01 PM
Hi,
I have a recording of a meeting that I attended but it's difficult to
make out some of what was said due to a relatively loud constant hum on
the recording. How can I eleiminate the hum to make the speech audible?

I could supply a clip of the soundtrack as a wav file if that would
help. I'm also looking for a freeware or shareware program that would
enable me to filter out the hum.

Any ideas anyone?

Flyn.

 
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Richard Crowley
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      01-20-2006, 03:09 PM
"flyn" wrote ...
> I have a recording of a meeting that I attended but it's difficult to
> make out some of what was said due to a relatively loud constant hum
> on
> the recording. How can I eleiminate the hum to make the speech
> audible?
>
> I could supply a clip of the soundtrack as a wav file if that would
> help. I'm also looking for a freeware or shareware program that would
> enable me to filter out the hum.
>
> Any ideas anyone?


You can use a freware software like Audacity or a
cheapware software like GoldWave, or any number
of high-end software to do this. Some applications
(like Adobe Audition which I use) have preset filter
settings for doing this. Note that you may have more
than just the "fundamental" frequency (50Hz or 60hz
depending on where you live). You may very well
also have several "harmonics" (multiples) of the line/
mains frequency (50-100-150-200Hz or 60-120-180-
240Hz, etc.)

Of course, it is always more desirable to eliminate hum
(and particularly other types of noise) while recording
rather than trying to remove them after the fact.

 
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bill@billmecca.com
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      01-20-2006, 03:54 PM
got to www.goldwave.com and download the shareware goldwave.

after you install the app, open the file with the hum, select a small
portion with just the hum,(left mouse button sets the left side, right
button sets the right end of the selection) and copy that to the
clipboard. Now select the entire clip again, go to the effects drop
down menu, select filters, and noise reduction. Use the clipboard as
the reduction envelope.

That should make the meeting audible for you.


flyn wrote:
> Hi,
> I have a recording of a meeting that I attended but it's difficult to
> make out some of what was said due to a relatively loud constant hum on
> the recording. How can I eleiminate the hum to make the speech audible?
>
> I could supply a clip of the soundtrack as a wav file if that would
> help. I'm also looking for a freeware or shareware program that would
> enable me to filter out the hum.
>
> Any ideas anyone?
>
> Flyn.


 
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