Regarding WBFM Receive in GRC

hi all

what do you mean by Quadrature Rate and Audio Decimation in WBFM Receive
block in GRC?

and Channel Rate and Audio Decimation in FM Demod block?

I have captured wireless microphone signals using the following flow
USRP>>(File_sink)>>WBFM Receive>>audio_sink,now i am able to hear the
demodulated signal on the computer.
But when i tried to demodulate the data from file_sink using matlab the
standard ‘fmdemod’ function is not working.

Can any one tell me about the functioning of the WBFM Receive block?


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