Sigma-delta floating point encoder

[tipeter]

Dear sdima1357!
Congratulations on the project! Although I'm not an experienced MCU developer - I've been working on it for about two years - I'll try to adapt it to a NUCLEO-F439ZI board!
I am interested in the theoretical background of the "sigma-delta floating point encoder". How is it different from the ordinary PDM encoder? Could you please give me some links or summarize the essence of the algorithm in a few sentences ? Of course I'm studying the code, but it would be useful to have some hints...
I'm working on a FLAC player that plays files stored on an SD card. I use WM8731 codecs; but I find the PDM solutions very interesting, especially the composite video signal generation!
Thanks in advance!

[sdima1357]

There is implemented virtual software second order sigma delta adc for the shift quantization noise to high frequency.
see here (it [provide useful links too at the end of document):
https://www.analog.com/media/en/training-seminars/tutorials/MT-022.pdf
But instead one bit ( two levels ) i use more bits (0-MAX_LEVELS)

[tipeter]

Thanks a lot for your help!
Your other projects are also very interesting, there is a lot to learn from them!