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Not the same things.
Undersampling is a sort of sampling that is poor against Nyquist frequency limit. In particulars It is a reason for distorsion.
Opposite to oversampling.
Decimation and under sampling are same as long as we only consider both of them not satisfying the nyquist criteria...
But the frequency domain representation of the two is somewhat different
Thanks for the responses.
In the decimation case we're considering an already sampled signal and wish to reduce the frequency by only considering every Mth sample, thus decimating by M.
In undersampling I guess you rather have a continous signal and sample it a frequency lower than the signals highest frequencies (but still >2xBW). So an IF signal centered at 45MHz and sampled at 20MHz will alias to 5MHz.
So in both cases we're reducing the frequency of the signals. Should be pretty much the same. Am I wrong here?
Friend, Decimation = Downsampling that to change a recorded digital sequence sampling rate to a lower level. eg 40K Hz with a decimation factor of 2 will results of 20K Hz output. Hope this will help you
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