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I was practicing the spectral editor and came up with this idea, which seems to work very well:
With a tape recording, I isolated a very quiet portion of the tape (that is, not much going on in terms of actual signal).
I copied that into its own file. I slowed it down to about 1/10th of its normal speed, and listened to it.
I did spectra editing on any sounds I recognized as being actual signal (in this case music). I erased them from the file so that all I had was the noised at 1/10th of its normal speed. I listened several times to make sure there wasn't anything that sounded like music.
Then I returned the file to its true speed, and listened again to make sure there wasn't any music. All you hear is noise.
I then isolated the two channels of the original sound into separate files where right channel was only in the right channel, left channel only in the left channel. I took the noise file and duplicated it many times to match the length of the music file, and separated it so that there were two files, one with right channel noise in the left channel and one with the left channel noise in the right channel, and pasted those into the separated music files.
That leaves me with 2 stereo files, one with the left channel signal in the left channel and the left channel noise in the right channel, and one with the opposite situation. I then used the file conversion filter to merge the two together, using (l+r or l-r) with the dB adjustment to get it set where you couldn't hear the noise at all.
The result sounds very good. Sort of like an aggressive noise reduction, but with no artifacts introduced, and no loss in music because there's no music in the file, just the constant hiss, etc.
Has anyone else tried this or am I just a little nuts, or is there an easier way to do this? The results are very good but it's a bit time consuming. I tried just "paste mix" where I inverted the phase of the noise, but then you have to guess without a preview, and the results weren't as good.
Dan
Sorry.. I left out the part where I took the noise and used a high-pass filter at around the spot where I could see there was a little bit of music, to eliminate most of the music to start with.
With a tape recording, I isolated a very quiet portion of the tape (that is, not much going on in terms of actual signal).
I copied that into its own file. I slowed it down to about 1/10th of its normal speed, and listened to it.
I did spectra editing on any sounds I recognized as being actual signal (in this case music). I erased them from the file so that all I had was the noised at 1/10th of its normal speed. I listened several times to make sure there wasn't anything that sounded like music.
Then I returned the file to its true speed, and listened again to make sure there wasn't any music. All you hear is noise.
I then isolated the two channels of the original sound into separate files where right channel was only in the right channel, left channel only in the left channel. I took the noise file and duplicated it many times to match the length of the music file, and separated it so that there were two files, one with right channel noise in the left channel and one with the left channel noise in the right channel, and pasted those into the separated music files.
That leaves me with 2 stereo files, one with the left channel signal in the left channel and the left channel noise in the right channel, and one with the opposite situation. I then used the file conversion filter to merge the two together, using (l+r or l-r) with the dB adjustment to get it set where you couldn't hear the noise at all.
The result sounds very good. Sort of like an aggressive noise reduction, but with no artifacts introduced, and no loss in music because there's no music in the file, just the constant hiss, etc.
Has anyone else tried this or am I just a little nuts, or is there an easier way to do this? The results are very good but it's a bit time consuming. I tried just "paste mix" where I inverted the phase of the noise, but then you have to guess without a preview, and the results weren't as good.
Dan
Sorry.. I left out the part where I took the noise and used a high-pass filter at around the spot where I could see there was a little bit of music, to eliminate most of the music to start with.
Always good to think things through ahead of time.
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