I found a very interesting piece of code for MDFT polyphase filter bank here. Unfortunately, there doesn't seem to be a paper describing the theory. Does anyone know some reference for the code? I'm especially interested in these 3 topics:
What are the data in the channels exactly? Are they supposed to be real, imaginary or complex?
The code computes only half of the number of bands. Is that due to real-valued signals used?
The result of the synthesis stage is build as a channel-wise difference of the outcome of the two synthesis filter banks. Why is it done like that? I can't find any paper describing this idea.
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