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In Reply to: Spectrum Plot for CD rip and 24/96 download - pics posted by AbeCollins on July 11, 2014 at 15:18:26:
Try looking at spectrum plots at several points in time. That will tell you what is related to the music and what is related to noise. This is most easily done with a spectral plot that shows frequency vs. time vs amplitude (X, Y, Z), but it can be done with an ordinary spectrum plot by selecting different points in the file.
The artifact at 28 kHz seems rather loud. More common is 15.7 kHz signal from video monitors, etc... Some converters have noise peaks due to charge pumps, etc., but these are at much lower levels. Were I doing this remastering, I would have noticed this noise and tried to figure out and eliminate its cause. Something was not right somewhere. If it was on the original master tapes the best results might have been to leave it in, or might have been to filter it out. (This would require subjective listening.) If it's in the remastering analog chain then something is seriously broken. Probably a bad sign. But remember if you buy recordings you are looking for good music and good sound, not measurements. :-)
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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Follow Ups
- RE: Spectrum Plot for CD rip and 24/96 download - pics - Tony Lauck 07/11/1417:49:10 07/11/14 (1)
- RE: Spectrum Plot for CD rip and 24/96 download - pics - AbeCollins 18:54:04 07/11/14 (0)
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