not at 0 without audio...

[filipdns]

Hello, I'm new on c++ and I don't found where I can remove the "noise" add if not audio playing, could you help me?...

I need only part of you project to add visualization on mine based on Qt particules. I try to understand the qt spectrometer on qt example but no comments at all in it then I don't understand anything on it lol

thanks a lot for your help.

[Venemo]

Hi. Feel free to use my code. I can try to help, but I'm not sure I understand what you want to do.

[filipdns]

Hello, thank you very much, I m trying to understand why without any audio input I have some data like noise Le 22 oct. 2018 21:49, "Timur Kristóf" <notifications@github.com> a écrit :

…

Hi. Feel free to use my code. I can try to help, but I'm not sure I understand what you want to do. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#1 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AhmNdklisnbycqKpLw6rrYz7m1o-3CqEks5uniFNgaJpZM4XzjHT> .

[Venemo]

What kind of input do you use if not audio?

[filipdns]

Oh i mean when the song is finish, still have some data from where I don't know... The screen is supposed te be full blue but is not the case Le 22 oct. 2018 23:03, "Timur Kristóf" <notifications@github.com> a écrit :

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What kind of input do you use if not audio? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#1 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AhmNduf6AGUwDDzZldFioPI57T4xPUZvks5unjKpgaJpZM4XzjHT> .

[Venemo]

Sorry I still don't understand what you are doing. Please tell me exactly what you are trying to do here. Are you using audio input from a microphone? Or somewhere else?

[filipdns]

I will do some picture to explain tomorrow, thank you very much for the time spend for me Le 23 oct. 2018 00:01, "Timur Kristóf" <notifications@github.com> a écrit :

…

Sorry I still don't understand what you are doing. Please tell me exactly what you are trying to do here. Are you using audio input from a microphone? Or somewhere else? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#1 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AhmNdvz0EarDLeLz71y4pJ5Fl9QfytvCks5unkBDgaJpZM4XzjHT> .

[filipdns]

I think the easiest way is to show you what I mean with example.
From your project, I remove the lines drawing old values and change the size and number of drawImage.
You will see even no sound, values are changing, qDebug of amplitude confirm that.

Thank you for your help again

https://www.dropbox.com/s/pcefcgibynngxf8/frequency-analyzer_test.zip?dl=0

[Venemo]

Hi. I took a look at your project, ran the app.

You will see even no sound, values are changing, qDebug of amplitude confirm that.

This is simply not true. If I disable my sound input, I will get completely flat lines.

[filipdns]

Hello, that strange, it's not the case on my side...

I try on 2 computeurs and switch all input off and the line is never flat...

I don't understand why then...

[Venemo]

This is how it looks for me:

On your screenshot you are not actually turning off your microphone, you just turned your speakers down.

[filipdns]

hello again, I'm very sorry to disturb you so much, but I think first about that but my mic is desactivated

[Venemo]

Well... I haven't used Windows for a while, so not sure how it behaves when you do that. All I can say is I disabled the microphone on my system and I got the screenshot that I showed you earlier.

[filipdns]

Hello,
Small question, about this project.
Do you know how can I have one bar for each specified frequencies (from own list) from the small test I sent to you ?...
I tried to understand fftreal about without success until now...
thank you very much for your help

[Venemo]

Do you know how can I have one bar for each specified frequencies (from own list) from the small test I sent to you ?...

I would suggest to read up on the theory behind the Fourier transform and especially the discrete Fourier transform. It has been some time since I had that course so I couldn't give you an in-depth answer, but speaking of my original code: basically each item in the array corresponds to the amplitude at a given frequency. This amplitude is then visualized by color. I have no idea how your "bars" work in your version so cannot give you a definitive answer on that.