[sdiy] converting data to audio... (WAY OT, sorry)

[Sowa Roman]

If you simply record those blips as sound, you loose everything.
I think better results would make tape recorder.
Have you ever listened to what is left from low frequency saw wave
recorded on MD?
Why not use CD-RW? CD are cheaper than MDs and CD-RW
writers are cheaper than MD players.

or maybe I'm missing something and you've hacked your MDplayer
to get access to data flowing inside of it.

But to answer your question. There was this project once, to use
custom technique to communicate between telecom stations
(don't ask). They figured out they want to use about 80 frequencies
the way you described, in range 400-3400Hz. They probably succeded,
but I wasn't there anymore to see that. They used FFT running on
DSP.

Roman

""-----Original Message-----
""From: Jaco Sloof [mailto:jacosloof at yahoo.com]
""Sent: Wednesday, January 02, 2002 9:43 PM
""To: SynthDIYmailinglist
""Cc: jacosloof at yahoo.com
""Subject: [sdiy] converting data to audio... (WAY OT, sorry)
""
""
""Greetings DIYers,
""
""JUst in case you're the fast "check-ot-and-delete-if"-mail reader,
""then click delete now...
""
""else? here's the lineup of the problem at hand...
""
""I have an MD-player (minidisk) and i heard that a 80 minute MD
""can hold up to 180 MB of uncompressed data (that is, NOT screwed up b
""the atrac3-algorythm).
""
""I also have LOTSA stuff on my computer (ea: e-mail, and
""musicprograms)
""that i want to save to this MD using ehh, i dunno...
""
""What i have done so far:
""1.0 --> made nifty little program (qbasic.exe v1.1 , the 1 that came
""with dos 6.22) that takes file (zip/ace/arj/rar/whatever)
""and converts/saves this into a ASCII7-file (that is, 1 character in
""file is 7bit,thus readeable)
""2.0 --> made routine to convert "any" 0-127 bitvalue (ea ascii7
""character) to a frequency, and beep it thru the PC-speaker using 
""SOUND freq%, durationinclockticks%: SOUND fixedbeep%, halfsecond%
""(any basicker (spell check?) knows what im talking about now)
""
""so the sound sequence consists of:
""2.1 a frequency containing 1 character out of the file...
""2.2 short pause...
""2.3 a fixed frequency (beep) as a separator, to indicate that a new
""character is coming, or has came...
""
""ok, so i put the bleeps of whatever.zip) on MD...
""
""how can i retrieve the data that is on MD?
""(yes i have a soundcard, with a good line-in)
""
""i am willing to deviate from the basic, just as long as i wont be
""needing to learn an entire new programming language to do so...
""Tbasic is as far as i go (thats no big deviance right..., sorry)
""
""any help is appreciated, so thanx in advance...
""


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