[LAD] SysEx data-conversion woes: nibbles and complements (Microwave 2)

[Jeanette C.]

May 13 2021, Fons Adriaensen has written:
...
> Mmmmm... I'll let you discover the errors (more than one)...
Thanks, I did. :) The indices were actually a typo, but the rest was
stupidity by design. :)
...
> Now if you want float samples (e.g. to do an FFT) you need
>
> for (...)
> {
>   int v;
>
>   v = (16 * sysex_string [2*i] + sysex_string [2*i+1]) ^ 0x80;
>   if (v & 0x80) v -= 256;  // Sign extension
>   float_sample [i] = v;
> }
This is great! I'd never have gotten this bit about the sign extension.
Is the 0x80 type size specific or would it be the same for converting to
double?
...

May I mention your name in the README of the finished tool? First FFT
and now this!

Best wishes,

Jeanette

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