Frequency spectrum at specific frequencies from extracted data using matlab

Status
Not open for further replies.
P

peponas

Junior Member level 3
Joined
Nov 1, 2010
Messages
26
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Visit site
Activity points
1,541
Hello,

I've made a code extracting the values of electric field versus time (measured in ns). I have to find the frequency spectrums for two different time windows from the same timeseries and compare them.
I would like to find the frequency spectrum for both the time sets, but calculated at the same frequencies. So far, I can find the frequency spectrum but for arbitary frequency (not GHz that corresponds to ns) and not for the exact same frequencies.


Any ideas?
 

If both windows have same lenght (number of samples), they'll map to the same frequency points.
 

FvM said:
If both windows have same lenght (number of samples), they'll map to the same frequency points.
Click to expand...

Ok, I undestand. But how frequency points (which are discrete points) can be matched to the real frequency?

I have as an example OriginLab Pro 's FFT, which is taking into account not only the field points( Y axis) but the time points as well (X axis) to extract the frequency spectrum. I suppose I can use the time points to find the frequency spectrum to the right scale, because if I find only the frequency points and not their units, it's not so right (I suppose)
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…