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Mar10-12, 03:07 AM
P: 628
Quote Quote by math_way View Post
Infact, sound is not affected by magnetic or electric field. So now, why is it that we are not using sound to read discs? Or is it that this idea is already being researched, and not much progress had been made yet?
I don't understand the question as it seems to have already been done - often called a '78', or 'single' or 'LP', in ancient days gone by.

In fact, the reverse has come to pass - old records that are too fragile to be played with turntable and stylus can now be scanned optically to provide a contact-less means of playing them.