Re: Been thinking on this for a while
Many years ago I conjectured using a digital microscope to take many photos of a vinyl or shellac record as it was rotated, then using one of the software packages used to analyse digital terrain photography to reconstitute the results into a single 'flying-down-a-canyon' topological/elevation stream - which could then be passed through a D/A converter to recover the audio.
Sounds like the sort of thing a first-year student undergrad could be given as a project.
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