At 05:51 AM 5/7/99 -0500, Doug Spence wrote:
>
>I want to salvage something from a damaged cassette, and I have a (rather
>crummy) audio digitizer. I've spent a couple of hours staring at the signals
>from stored programs but I just don't 'get it'.
A number of Commodore emulators and tools will process a sampled .WAV file
into runnable data.
My web site at <
http://www.threedee.com/jcm/> (winner of the "Geek Site
Of The Day" Award on October 16, 1996) has some of my aspirations to
recover data this way, too.
After looking at the source code of several tools that do this, I was
disheartened to see they use techniques as simple as measuring the
time-distances between zero-crossings, and no fancy FFT is involved.
When you think about it, the hardware in many of these early machines
did no more than watch the timing on the square waves, too. A signal
processing approach might be able to rescue more data, or remove
print-through on old tapes, of course.
- John
Received on Fri May 07 1999 - 09:51:37 BST