fft,dft

[aswin p ajayan]

hi guys,
I am a newbie
i need to get frequency vs magnitude plot of sampled signal . I learned fft for that . but i am not sure how to scale frequency. can any body help me please . or just give the links of some pdf's which might be usefull . iam using pic 18f4550

 

[rc3po]

hi guys,
I am a newbie
i need to get frequency vs magnitude plot of sampled signal . I learned fft for that . but i am not sure how to scale frequency. can any body help me please . or just give the links of some pdf's which might be usefull . iam using pic 18f4550

Hello Aswin,
I'm new here also and haven't learned about uControllers yet. I have an Arduino starter kit ordered that should arrive next week.
Do you have an oscilloscope? Can you probe the pic with a scope and find what you need?

 

[aswin p ajayan]

actually what i want to perform a harmonic analysis on a composite signal. ie I dont know the out put freq to caliberate in the way you explained . any way thanks for the attention

 

[misterT]

https://www.dspguide.com/pdfbook.htm