Hiss removal not working

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FrankiePee

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I am a newbie to Cool Edit Pro 2 I therefore need some help. I have a recorded track that I have applied the Hiss Removal plug-in to reduce the hissing noise. But when I play the track, the noise is still there. I highlight the waveform, preview it, save it after hiss removal yet the hissing does not go away. What I am doing wrong ?
 
You have to sample a quiet section of the track, a section with no music. Then save the sample, and close out of noise reduction. Then with the track you want in Edit View, make sure that the whole thing is either highlighted, or nothing is highlighted, so that the hiss reduction runs on the whole track. Then go into noise reduction and open the sample you saved. Then run it on the whole track. It *will* reduce hiss. Cool's a monster hiss reducer.
 
I had the same problem, but on the noise reduction choice. I'd find a "quiet" part outside of the music -- a part in which you would hear the ambient noise in the hall in which I was recording. I would "block" that section, and then I would "get a noise profile" from that block.

My mistake was that I would then check "OK" instead of cancel. In effect, I applied the reduction of the noise profile to the exact same block from which I got it. I'd play back, only to find no background noise at all -- but only where my block had been.

I found, as dobro indicated, that you then have to go back and select the entire wave. Then return to noise reduction and apply the "profile" (in whatever percent you want) to the entire file. That does the trick. Occasionally I get a little "warbling" effect, but I can often lose that by blocking it and then generating silence in the block.
 
Also, ensure that you are working with at least a 16 bit file. You can't use NR to reduce the noise inherent in an 8 bit file. It might sound like it has on preview but when you process it and replay in 8 bits, the hiss is back.
 
Re: Noise removal techique via sampling

2 questions...

1) Does the noise removal work better, sampling a longer section of noise?

2) Does it also remove other frequencies as well? Or is it quite reliable, assuming that you've gotten a good sample. It appears that other sounds were removed when i did this on my track... either that or i just imagined things?!
 
Generally the longer the section you sample the better (and up to a point, the more samples you request in the relevant drop-down box - experiment as necessary).

If the noise is confined to a particular frequency range, then you may find you get best results by dragging the frequency line to remove noise only at the desired frequencies.

If you remove hiss, your brain sometimes tells you that all high frequencies have been taken too. Likewise reducing rumble can trick the ear into thinking low frequencies from the music have been lost. Unless you are overdoing it, that shouldn't be the case.

That's actually the key - don't overdo it. Reduce the noise at source if possible. Use NR only as a last resort. Use it clinically, and spend some time getting a feel for the effect of adjusting each parameter. Match the NR settings to the particular case you've got. It's remarkable what can be achieved, but don't have your expectations too high.

If you are using Audition 1.5, try it in spectral view with the offending frequency range 'marqueed' for greatest precision.
 
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