[Discuss-gnuradio] iir filter in spectrum analyzer

[adib_sairi]

Dear all,
I have a question regarding the usage of single_pole_iir_ff filter in the
fftsink_nongl.py which is used to construct the spectrum analyzer in
gnuradio-3.1.3. what is the usage of this iir filter since the alfa value is
equal to 1 which give the value of input the same as the value of the output
(refering to the single pole iir filter explanation in
https://radioware.nd.edu/documentation/a-dictionary-of-the-gnu-radio-blocks
-- please fixme if i am wrong). in the previous post, firas told that this
filter is used for the averaging purposes
(http://old.nabble.com/question-regarding-usrp_fft.py-td24440532.html#a24466469)
but what is the value that it average? 

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Mohd Adib Sarijari
Universiti Teknologi Malaysia
www.fke.utm.my
www.utm.my
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