Hey Alberto, just a hopefully helpful remark: Your operating system (I think that's windows?) has a functionality for "screen shot", which makes better pictures than a camera trying to take a picture of a screen :) Maybe your Keyboard even has a "PrintScr" or "Stamp" key!
Also, in case you need to show a picture of a graph like yours to someone, it's easiest to click on the graph with the middle mouse button, then you get a menu, and in that menu, there's a "save" button which is even better (and hopefully easier). Best regards, Marcus On 20.04.21 12:19, Alberto wrote: > Thank you very very much ! > > > > Inviato da iPhone > >> Il giorno 19 apr 2021, alle ore 22:36, Ron Economos <w...@comcast.net> ha >> scritto: >> >> >> >> The QT GUI Frequency Sink does have a option to hide the other side of the >> spectrum. >> When float input is selected, an additional parameter "Spectrum Width" is >> available. >> Options are "Full" and "Half". >> >> Ron >> >> On 4/19/21 12:03, Kevin Reid wrote: >>> On Mon, Apr 19, 2021 at 11:44 AM Alberto <alberto_gnura...@libero.it >>> <mailto:alberto_gnura...@libero.it>> wrote: >>> >>> To obtain a real FFT i can use Float to Complex block ? >>> >>> >>> Float to Complex will do the same thing you're seeing now — it just writes >>> a zero >>> imaginary component into the stream. >>> >>> If you need a signal with an actually one-sided spectrum you can use the >>> Hilbert block, >>> which uses the Hilbert transform to generate a 90° phase shifted quadrature >>> component. >>> But that is just wasted compute cycles unless your next signal processing >>> step actually >>> needs that result. For viewing purposes, just ignore the other side of the >>> spectrum. >>> (It would be nice if the QT GUI Frequency Sink had an option to hide it >>> when given >>> float input, but as far as I know, it doesn't.)
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