From: Ronan Cunniffe (rcunniff at domain wilde.cs.tcd.ie)
Date: Sun 02 Sep 2001 - 23:59:57 IST
On Sun, 2 Sep 2001, Lotas T Smartman wrote:
> Has anyone ever heard of an option to convert data to aduio and then to =
> play it through a soundcard into a tape recorder and on to an ordinary =
> audio tape? I was just thinking about it. Data through a modem is at domain =
> 56kbits/s. If an audio tape is capable of sounds of twice or 3x that, =
> then you could store anything from 40 - 60mb on a normal tape. This is =
Yes, you can do this, but it's not *quite* that simple.
1) Playback rate must equal record rate. Any leeway you need to
leave is going to come out of your datarate.
2) You need *much* better error correction that a modem, which assumes
that garbled packets can be re-transmitted on request. CD-ROMs (according
www.cdrfaq.org) store data in 2324 byte frames, of which 2048 are data and
276 are e-c.
3) There may be some 'features' in your card for 'cleaning up' sound.
So, it can be done, but if every bit is sacred then whoever writes the
code will have to know an *awful* lot about signal processing. All that
said, I know that various crazy people used their soundcards as 44.1Khz
digital oscilloscopes....
> cool because a normal tape costs less then =A35 for about 10 around here =
> (there pritty crappy tapes, but work well!). Anyway, anyone have any =
> ideas? Twould be nice if it worked on windows and linux, or even java!!! =
No. I'm afraid those crazy people were using M$-DOS, or Amigas.
> Lotas T Smartman
> www.lotas-smartman.net
>
Ronan C.
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