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Don Cox wrote:

> Modern methods of modulation, using a combination of amplitude and phase
> with error correction, can carry several bits in one cycle of the
> carrier. Basically, it is a matter of having various distinguishable
> shapes for the wave, and mapping each to a number.
>
> http://www.physics.udel.edu/wwwusers/watson/student_projects/scen167/thosguys/qam.html
>
> You could probably store 3 minutes of CD quality (16/44.1) sound on a 3 minute 78.
> Maybe even 24-bit sound.

Ah, but in time the encoding scheme will have been lost and then how
will it be reconstructed? The archeologists of the future will be at a loss.

(On the other hand, the chronologists of the present may be lost with
your post; it carries yesterday's time stamp.)

Mike
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