I've been trying to understand what's happening under the hood with the polyphase filter bank in the generic_mod_demod.py.
Here's what I think is happening, since nfilt=32 which is also used the sampling rate of the firdes.root_raised_cosine filter means that the highest rate the polyphase filter will see is an interpolation factor of 32 from the basic inputted signal sampling frequency? while pfb.arb_resampler_ccf has a sampling rate of samples_per_symbol which in the default case is =2 ... does this mean that the polyphase filter is interpolating by a factor of 2? If I am inputting data at a sampling rate of 16kHz and I'm trying to interpolate them to 256kHz before sending them to the user how is the 256kHz and the desired interpolation factor of 16 taken into account in the RRC filter in the generic modulator block. I've read the gnuradio pfb page but I think I'm missing something important here. Thanks -- Almohanad (Al) Fayez
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