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I am trying to track down a citation to Julian Hirsch and his comments
on digital audio. Specifically he is supposed to have opined (in 1972
or thereabouts) that a 5% sample of an analog sound signal would be
sufficient to be indistinguishable from the original. This is
supposedly based on some experiments but I can find no reference to
these or this statement anywhere. I would wonder what kind of digital
audio encoders/decoders would even be available in 1972 for this
assertion to be made.

Can anyone point me in the right direction.

Cheers

Jim