toughy (PPG waveforms)

[Jeremy Brookes]

> Actually, it would be called .dem since it demodulates only
> and yes, modems work like that, but only up to 1200 bps afaik.
>
> BTW, how fast is this PPG dump? Considering the common
> transmision speeds used in PPG times it would be enough to use
> FSK decoder hooked directly to printer port, and scan it.
> Little software work and we have binary file.
> (Or little more software work - like signal processing - and we have
> binary file out of wav file with no hardware used)

Didn't the original poster (Paul?) say that the files were already in wave
format? If so maybe I could have a go at them with MatLab (a math's
package). This can read in the wave files and then it would be easy(-ish) to
write a script to analyse the frequencies and try and decode the bits and
bytes in there. Then you could even plot them to see if they look like waves
and play them back.

jezz.