Re: Strange FFT AUDIO

[Marcus Müller]

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 <w6rz@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_gnuradio@libero.it
>>> <mailto:alberto_gnuradio@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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