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Topic: Simulation of Sampling without Anti-Aliasing-Filter
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Peter Mairhofer

Posts: 36
Registered: 8/18/10
Simulation of Sampling without Anti-Aliasing-Filter
Posted: Apr 14, 2013 6:07 AM
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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



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