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| − | <math>y[n]=sin[n] with a sample rate of <math>pi/2 \!</math> | + | <math>y[n]=sin[n] \!</math> with a sample rate of <math>pi/2 \!</math> |
Revision as of 19:03, 11 September 2008
Periodic Signals Revisited
1. By sampling at different frequencies the function $ y=sin(x)\! $ can appear as both periodic and non-periodic in DT. For example:
$ y(x)=sin(x) \! $ in CT
$ y[n]=sin[n] \! $ with a sample rate of 1
$ y[n]=sin[n] \! $ with a sample rate of $ pi/2 \! $
