Quote:
Originally Posted by Ted Kendall
Whoa! Concealed assumption alert.
Mere complementarity does not an inaudible noise reduction system make.
Simple compansion around a noisy channel, be it analogue, digital or pink with purple spots, isn't a particularly good idea. Every analogue noise reduction system apart from Dolby has audible artifacts under some real-world conditions, usually on piano or bass guitar. If Dolby isn't lined up properly, you can hear that working, too. The art of it is to use the characteristics of human hearing to mask the noise modulation effects - Dolby A and SR use multiple bands, Dolby uses a sliding turnover...
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Sure, for example DBX could noise pump on a solo bass guitar. But my point was the comparison between old compander NR and today's playback only, expander only types which range from free software to the latest CEDAR.
Back in the mid 60's Ray Dolby could claim his (properly aligned) Dolby A system reduced tape noise transparently across the audible range by 10db. Let's compare that to the best 2018 CEDAR broadband Denoiser. Can it also achieve an objective reduction of disc or tape noise of 10db, across the full audible range? If not, what can it achieve in objective, measurable terms?