Re: Strange FFT AUDIO

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

Re: Strange FFT AUDIO

Thank you very very much ! Inviato da iPhone > Il giorno 19 apr 2021, alle ore 22:36, Ron Economos 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

Re: Strange FFT AUDIO

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

Re: Strange FFT AUDIO

Hi Kevin! It does have that option: When you set it to "Type: Float", a choice "Spectrum Width: Full" appears, which you can change to "Half". Best, Marcus On 19.04.21 21:03, Kevin Reid wrote: > On Mon, Apr 19, 2021 at 11:44 AM Alberto > wrote: > > To

Re: Strange FFT AUDIO

Hi everyone, On 4/19/21 9:03 PM, Kevin Reid wrote: 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.) But it does! Just switch the input to real

Re: Strange FFT AUDIO

Thank you very much ! To obtain a real FFT i can use Float to Complex block ? Inviato da iPhone > Il giorno 19 apr 2021, alle ore 20:36, Kevin Reid ha > scritto: > > > GNU Radio is designed for working with IQ / complex signals. You are seeing > the symmetric spectrum that results from

Re: Strange FFT AUDIO

On Mon, Apr 19, 2021 at 11:44 AM Alberto 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

Re: Strange FFT AUDIO

On Mon, Apr 19, 2021 at 11:09 AM Alberto wrote: > Why a second peak at 2 KHz with same amplitude of 1KHz ? > GNU Radio is designed for working with IQ / complex signals. You are seeing the *symmetric* spectrum that results from treating a real-valued signal as a complex one with a zero