I process a lot of Edison cylinders and very early 78s, where the noise tends to be very high. I have had good luck with the following:
After de-clicking, I select a portion of the record where there is no signal, and sample the noise, then zoom the file out to the complete song and preview it with the "keep residue" filter on.
I then adjust the filter until I cannot hear enough of the source to tell if there is music or not (that is, it sounds like pure noise. Then I run the file through the CNF using with Keep Residue still on.
I then use file conversion to turn this into the right channel of a stereo file, and use file conversion to turn the original file into the left channel of the same stereo file (using paste mix). Then I convert the file into a mono file again, using the L-R file conversion.
This works incredibly well for some songs. Occasionally it introduces some artifacts, but I have found that when that happens, I just need to go back and redo the original keep residue function so that the signal is less audible.
Anyway, just thought I'd pass this on for those who are working on the old mono recordings.
Dan McDonald
After de-clicking, I select a portion of the record where there is no signal, and sample the noise, then zoom the file out to the complete song and preview it with the "keep residue" filter on.
I then adjust the filter until I cannot hear enough of the source to tell if there is music or not (that is, it sounds like pure noise. Then I run the file through the CNF using with Keep Residue still on.
I then use file conversion to turn this into the right channel of a stereo file, and use file conversion to turn the original file into the left channel of the same stereo file (using paste mix). Then I convert the file into a mono file again, using the L-R file conversion.
This works incredibly well for some songs. Occasionally it introduces some artifacts, but I have found that when that happens, I just need to go back and redo the original keep residue function so that the signal is less audible.
Anyway, just thought I'd pass this on for those who are working on the old mono recordings.
Dan McDonald
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