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[Discuss-gnuradio] GNU Radio IIR Filter Taps

From: Keyur Parikh
Subject: [Discuss-gnuradio] GNU Radio IIR Filter Taps
Date: Fri, 22 May 2015 10:20:18 -0700


I've been trying to move the fm De-emphasis (an IIR filter, I'm pretty sure) functionality of the WBFM_Receive block into an FPGA, and I'm a little confused as to how the taps work.

I'm in fm_emph.py and can see the taps listed as

btaps = [b0, b1]
ataps = [1, a1]

I had assumed this is a first-order IIR filter, and am basing my simple algorithm on a structure as seen in this link


Is there something I'm missing? I don't seem to be getting the correct results based off my input data.


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