Regarding Mixing matrix in asr_calibrate.m

[Gin08]

In mixing matrix,

1. Do real have any significance? As far as I can see the output from reshape is always a non imaginary matrix.
2. Do we have need to do sqrtm?
3. Can Mixing matrix consist imaginary values? Not all sqrtm(A) produces a proper matrix with rational numbers.

M = sqrtm(real(reshape(block_geometric_median(U/blocksize),C,C)));

If you have any document supporting the explanation of it. Please add it in comment. Thank You.

[Gin08]

I've little bit of understanding about tranformation of signals throughout the code.

I find some sort references with 2. I think the code can be modified a bit by reducing unnesecary steps.