You did not actually ask a question.
However I get the impression that ‘dmfs’ is complex, and that is not going to work. That argument has to be a (samples x channels) real matrix, so you either need to use:
audiowrite('test.wav',real(dmfs),256000);
or:
audiowrite('test.wav',abs(dmfs),256000);
to get it to work.
If you want to write extra channels with the imaginary or phase information, that is certainly possible.
Something like that might be:
audiowrite('test.wav',[real(dmfs) imag(dmfs)],256000);
or:
audiowrite('test.wav',[abs(dmfs) angle(dmfs)],256000);
For this, ‘dmfs’ must be a column vector.
You can reconstruct it after you read it.
If you want to save a complex vector, it might be easier to just use the save function to save it as a .mat file:
Fs = 256000;
save('dmfs.mat','dmfs','Fs')
.
