AHHH MY EARS!!!

[GHZpc]

Unfortunately, I have to remove an awful hissing/sandpaper noise from all of my captures. So, I create a wave file using VirtualDub and remove the noise using CoolEdit.

Cool Edit removes most of the noise but a very small (yet hearable)noise replaces the awful noise. The noise sounds much better than the hissing/sandpaper noise, but the noise is still unbearable. It is a very high pitch noise.

DOES ANYONE OUT THERE KNOW A VERY GOOD METHOD OF REMOVING NOISES THAT SOUND LIKE HISSING/SANDPAPER?

OR DOES ANYONE KNOW HOW TO REMOVE THE HIGH PITCH NOISE?

THANKS BIG TIME FOR ANY RESPONSES!!!!!!!

[mikewg]

I'd recommend trying a new sound card. Doing that removed all my scratchy "airy" sounds that were being captured.

Also it might be your source... I notice if I capture directly from cable, everything fine. But if I capture from a VCR tape, sometimes I'll have a bad quality sound with it.

[vitualis]

CoolEdit does a pretty good job of removing noise. But if it is overwhelming to begin with, it can only do so much.

Perhaps there's a reason why you are getting so much noise??

If the noise is a very high pitch, then you could try using a low pass filter as well (i.e., cuts off everything pass a certain frequency). However, you'll be losing a lot of the quality of the original audio... You should try to work out the source of the noise if possible.

Regards.

[N0SoopForU]

Are you getting an accurate noise sample from your source? Make sure you grab atleast a half second portion of just the background hissing noise (no foreground noise). Commercial transitions can be a good place to get these.

Is the noise after reduction a bubbly, sci-fi noise? If so, that is normal as long as it isn't too audible. Cool Edit doesn't actually remove the noise from your sound file. It just replaces it with a less obnoxious noise. If you are getting too much of the "bubbly" sound, then try turning down the reduction rate. The higher the rate, the more signal is lost.

Also, make sure you aren't normalizing the file after reduction. This will make the "bubbly" noise much more noticeable.

<font size=-1>[ This Message was edited by: N0SoopForU on 2001-11-09 11:03:04 ]</font>

[GHZpc]

mikewg:
My sound card a Creative Sound Blaster PCI and I don't think it's a very bad sound card. I had thought at one time that it could just be the "Line-In" part of my soundcard that was causing the problem, but someone told me it probably wasn't.
And this problem always occurs regarless of what my source is.

virtualis:
Could you tell me how to use a low pass filter?

N0SoopForU:
I recorded my noise sample while a movie was showing an FBI warning. So, I got about 20 seconds of nothing but a bad high pitch/sandpaper sound.
And yes, the noise is a bubbly noise but it was very audible. I will try reducing the reduction rate and post my results later.

Thanks guys!

[vitualis]

<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD><font size=-1>Quote:</font><HR size=1 color=black></TD></TR><TR><TD><FONT SIZE=-1><BLOCKQUOTE>
On 2001-11-09 15:22:34, GHZpc wrote:
Could you tell me how to use a low pass filter?</BLOCKQUOTE></FONT></TD></TR><TR><TD><HR size=1 color=black></TD></TR></TABLE>

Load CoolEdit 2000.

Transform --> Filters --> FFT Filter

Then there will be a variety of defaults that you can choose including several low pass ones. Note that you can edit how the audio is filtered yourself.

Regards.