can you please expand on "factor"

in the code you have 
```


%       'factor'    the BioSemi EEG normalization factor for converting the
--
19 | %                   TRF to microvolts (524.288mV / 2^24bits)

```
the factor in speech_data.mat is 0.0313


where these numbers come from? what do they mean?

I am aware that 524.288  * 10^3 / 2^24 = 0.0313
