Chirp Signal Processing

[mcollins27]

I'm trying to process a Chirp signal to resemble the image named "desired signal".

A Blackman-Harris window and FFT provides the correct shape i'm after, but I need just the magnitude of this signal. 

I then tried a spectrum FFT (magnitude peak) with a blackman-harris window. Which provided me with the magnitude response I was after, but the signal is ramping up between 4-12kHz, when I need it to ramp down. 

Does anyone have any suggestions?

I've also attached my VI. 

Thanks 🙂 

[srikrishnaNF]

Hi mcollins27,

---

I then tried a spectrum FFT (magnitude peak) with a blackman-harris window. Which provided me with the magnitude response I was after, but the signal is ramping up between 4-12kHz, when I need it to ramp down. 

 As you mentioned above,can you please provide the details including amplitude, f1 and f2 ?

[mcollins27]

Amplitude = 10

F1 = 4kHz

F2 = 12kHz 

Thank you!

[srikrishnaNF]

Hi mcollins27,

Context help says that the frequency ramping depends on sampling rate as well.

Can you please confirm what is sampling rate and other details?

[mcollins27]

Hi,

I attached the VI in the first message.

The details such as sampling rate, amplitude etc. can be seen there.

Thank you