PrinceGaz wrote:
> Hey, the ZX Spectrum (the finest 8-bit machine made) stored data
> using monaural audio. It averaged about 1500bps, not exactly
> super fast, but faster than the ZX81 which was only about 300bps.
*cough* Excuse me! Best 8 bit machine? No way! Not as far as Data storage was
concerned, it was a real slug in that area.
BBC Micro and Acorn Electron 2400bps
BBC Master series 2400bps or 4800bps with stereo adapter
> I guess given MD audio is rather better than telephone quality,
> it should be able to store data with all the phase-shift stuff used by
> a 56K modem. Of course perhaps these v90 modems use signals
> the ATRAC algorithm would trash?
Yes they do, but that doesn't mean achieving a higher data rate isn;t possible
using combinations of tones an ATRAC algorithm wouldn't trash. If you
calibratedthe volume, you could probably come up with a system that not only
combined tones but also changes in volume to represent data bits. Phase
shifting techniques are also not removed by ATRAC. There would be some quite
sophisticated electronics to encode and decode the signal, but if you use a
22kHz tone and only represent 1 bit through phase shifting, that's still
22'000bps. If you applied some of the techniques modems use to this, I don't
see why you should be able to achieve at 4 times that.
Of course, when it comes to selecting individual files and obtaining directory
listing of what is on the disk, then you might run into problems.....
--
Magic
Location : Portsmouth, England, UK
Homepage : http://www.mattnet.freeserve.co.uk
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