Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.



Simulation of Sampling without AntiAliasingFilter
Posted:
Apr 14, 2013 6:07 AM


Hi,
Suppose I have an analog signal consisting of only 2 Fourier coefficients at Omega and 4*Omega (and Omega, 4*Omega).
When I sample this signal at a rate 4Omega, the 4Omega gets mirrored to 2Omega (implicit aliasing) and I get a signal containing Omega, 2Omega, 3Omega, 4Omega, ...
I want ti "simulate" this but I do not understand why it doesn't work with downsample.
I created a high resolution signal X with Omega and 4Omega. Then I used downsample(x, 2) and would expect that the spectra has evenly spaced peaks now. But that's not the case.
Thank you Peter



