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Re: [Discuss-gnuradio] Getting the max amplitude of an FFT plot (FFT sin

From: Dan Rosenqvist
Subject: Re: [Discuss-gnuradio] Getting the max amplitude of an FFT plot (FFT sink)
Date: Mon, 29 Jun 2009 02:48:45 -0700 (PDT)

Anthony Hsu wrote:
> Hi,
> I am trying to write a simple program that changes the TX frequency in
> response to some RX stimulus.  I want the TX frequency to change if any
> part
> of the RX signal in a band I am monitoring exceeds a threshold amplitude.
> My problem is I don't know how to get the amplitude of the RX signal in
> the
> FFT plot.  The "peak hold" option saves the max amplitude at every
> frequency
> across the band you are monitoring, so if you could access the amplitude
> values of these saved peaks, you could find the max amplitude and test if
> it
> exceeds the threshold amplitude.  But I don't know where (what variables
> or
> what function) the peaks are saved.  Could somebody point me in the right
> direction?
> Best regards,
> Anthony
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

Hi Anthony,

I'm working on a similar project, and with some minor alterations to
usrp_spectrum_sense.py you should be able to get peaks from the fft sink.
For more info on the coding, please see Firas excellent explanation:


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