just did a quick test, couldn't be simpler [cid:6a484104-b817-47bc-b349-49ea6aaca429] max_i reports the argmax of the fft, with wrapping
So in the above example: * 1 kHz -> 1 * 5.5 kHz -> 5 * -1 kHz -> 31 * -8 KHz -> 24 increase from 32 to increase resolution Kyle ________________________________ From: james jordan <james.jordan....@hotmail.com> Sent: Monday, November 30, 2020 18:37 To: Kyle A Logue <kyle.a.lo...@aero.org>; discuss-gnuradio@gnu.org <Discuss-gnuradio@gnu.org> Subject: Re: how to auto detect peak frequency in QT FFT sink Hi Kyle, is there any document for how to use the block in gr-fhss-utils especially for fft peak block. what is the two output of fft peak? <http://aka.ms/weboutlook> ________________________________ From: Kyle A Logue <kyle.a.lo...@aero.org> Sent: Friday, November 20, 2020 12:26 AM To: james jordan <james.jordan....@hotmail.com>; discuss-gnuradio@gnu.org <Discuss-gnuradio@gnu.org> Subject: Re: how to auto detect peak frequency in QT FFT sink cmake version is too low so i can not build gr-fhss gr-fhss has a 3.7 and a 3.8 version if you check the tags on github how to store max result to a gui label? qt-number-sink maybe ________________________________ From: james jordan <james.jordan....@hotmail.com> Sent: Wednesday, November 18, 2020 22:07 To: Kyle A Logue <kyle.a.lo...@aero.org>; discuss-gnuradio@gnu.org <Discuss-gnuradio@gnu.org> Subject: Re: how to auto detect peak frequency in QT FFT sink Hi Kyle, Thanks. my cmake version is too low so i can not build gr-fhss. i try to use fft->max but how to store max result to a gui label? <http://aka.ms/weboutlook> ________________________________ From: Kyle A Logue <kyle.a.lo...@aero.org> Sent: Thursday, November 19, 2020 4:05 AM To: james jordan <james.jordan....@hotmail.com>; discuss-gnuradio@gnu.org <Discuss-gnuradio@gnu.org> Subject: Re: how to auto detect peak frequency in QT FFT sink 2 things that come to mind: 1. stream -> fft -> argmax 2. in sandia fhss utilities they have an FFT Peak block that does what you want https://github.com/sandialabs/gr-fhss_utils Kyle Logue Senior Engineering Specialist ⚝ The Aerospace Corporation ________________________________ From: Discuss-gnuradio <discuss-gnuradio-bounces+kyle.a.logue=aero....@gnu.org> on behalf of james jordan <james.jordan....@hotmail.com> Sent: Monday, November 16, 2020 19:09 To: discuss-gnuradio@gnu.org <Discuss-gnuradio@gnu.org> Subject: how to auto detect peak frequency in QT FFT sink Hi all, i want to see the fft of the signal and also want to detect the peak frequency if there is a peak signal. how to achieve this?
