[bigbillheck]

> To store a "0" data bit, there will only be one peak in an 8us window; to store a "1" data bit there will be two peaks.

Looks to me like this is just FSK (https://en.wikipedia.org/wiki/Frequency-shift_keying), and if so that's great because it means you can use techniques more sophisticated than the ones in that post, which in turn means that you have a chance to go after more 'unreadable' discs.

[scarybeast]

Do you have any recommendations for any particular techniques or software? I'd gladly try them.

[bigbillheck]

The classical approach is a matched filter.

Here's some references: https://www.rfcafe.com/references/articles/wj-tech-notes/fsk...

http://edge.rit.edu/content/P09141/public/FSK.pdf

There's lots of matlab code floating around out there, if you're willing to try gnuradio that'll work (for example: https://nccgroup.github.io/RFTM/fsk_receiver.html), and this looks promising: http://www.whence.com/minimodem/

ETA: Audacity might be able to do it too : https://www.youtube.com/watch?v=tKNNnbgoGdI

[marcan_42]

This is how I've done it in the past, seems to work quite well on your wav file :)

https://colab.research.google.com/drive/1Zvb6bQfC3thc5-39exp...