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Aliasing (Fourier Transform) 
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#1
Feb113, 08:08 AM

P: 11

Hi. I have been given a plot for 1 Hz, sampled at 0.2 sec. And, 4 Hz and 11 Hz has also been plotted. So, from the plot, I can see that its really hard to distinguish between the signals after digitalization. My question is how do I find the next higher frequency which, when sampled at 0.2 secs, will look like a 1 Hz wave ?



#2
Feb513, 07:55 AM

PF Gold
P: 244

Vidar 


#3
Feb513, 01:09 PM

P: 11

I mean one sample every 0.2 seconds



#4
Feb613, 11:13 AM

PF Gold
P: 244

Aliasing (Fourier Transform)
According to Nyquist theorem, the minimum sampling frequency is twice the frequency you are trying to sample. Below you see a link to a PDF explaining this. http://redwood.berkeley.edu/bruno/npb261/aliasing.pdf Vidar 


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