tuga
Legal Alien
And oversampling process may simply add its own imperfections. Thus isn't always any kind of cure-all. May simply be a waste of time and money and you'd be better spending more on, say, your speakers.
Correctly sampled, say, 48k material means there is NO INFORMATION left in the series of samples which tells you about any original components above 24kHz. Ideal reprocessing the 48k series up to a higher rate can't recover what isn't in the 48k steries. Not can it 'know' what filtering was employed during the process of creating that 48k series. You can decide to 'guess' and tell it to fiddle about on that basis. But you'd then need to 'know' something that you have to guess/deduce/etc. (Ahem!) This is what 'tone controls' are for. 8->
As far as I understand the goal of resampling to very high rates is to improve reconstruction at Nyquist, NOT to recover data which isn't there.