Comments

Mike M. wrote on 4/10/2002, 6:06 PM
All I could hear is the hum/buzz and then clicks and nothing else so it's difficult to help. Assumming that the portion of the wave file you want to reduce or remove is the buzz part, you should play around with a parametric EQ (like the one in Vegas).

I got some decent results setting the controls to:

Amount: -60db
Filter Style: Band-notch/boost
Center Frequency: 200 Hz
Band Width: 5.0

What you are trying to do with this filter is "notch" out the offending noise (of course everything else with the same frequency will be notched out as well). By adjusting the "Center Frequency" slider, you can select any frequency in the audio spectrum. Adjusting the "Band Width" slider determines the width of the notch or how much either side of the "Center Frequency" will be notched out. The "amount" is the amount of reduction, where -60 dd is completely reduced.

The key to sucessfully notching is what the noise is like. A full spectrum noise (like hiss) when notched will take out too many usuable frequencies. A more specific noise or one that is made of a single frequency will be easier.
Wayne wrote on 4/10/2002, 10:17 PM
If you have SoundForge, you can use the Spectrum Analysis tools to determine the exact frequency of the hum including its harmonics. You can then Sound Forges Paragraphic EQ to notch filter out these frequencies, up to 4 at a time, ie set frequencies, Width (Q) to 0.3 and gain to -25 db.

I have used this method before on a poorly shielded cable cable causing hum. The hum was the odd harmonics of 60 hz, ie 180,300,420,540,660 and 780.
I notched the first 4 freq twice and the remaining one time. I then did a low freq boost of 3 db up to aroung 700 Hz. The hum was totally gone.

An easier but more expensive method is to use SF Noise Reduction. This also will have to be used within Sound Forge.

With NR you may be able to clean up the clicks also. Sound Forge also has a feature (pencil) where you can redraw the waveform on the screen which would allow you to clean up the clicks. If you have a lot though, it will take some time.
fongaboo wrote on 4/14/2002, 12:39 AM
Heh. I just realized that the 'clicks' is the music. :-P

You guys are purist rock guys aren't you? :-)

lungjian wrote on 4/17/2002, 12:19 PM
Noise Reduction will work within VV3.0 as well. Sound Forge is not required. You have to dig a little to find that info, though.
fongaboo wrote on 5/8/2002, 8:05 PM
This is a bit old.. but I just now got around to tackling this piece again..

I can now see why this confused most of you.. But if you listen with headphones, you can clearly hear in the background the familiar sound of line hum differentiated from the hard synthetic beats (which are, granted, pretty noisy themselves).

Gonna try the suggestions that had been given to me, but just thought I'd make more clear what was hum and what wasn't to see if anyone had anything else to add.