Part 1
Periodic signal Sampling the signal at a frequency that is a rational multiple of the frequency of the signal will result in a periodic Discrete Time signal. Sampling the signal at a frequency that is not a rational multiple of the frequency of the signal will result in a non-periodic Discrete Time signal.
My all time favorite periodic signal- Sin(t)
File:SIN.jpg Periodic signal turned Non-Periodic File:SINNP
Part 2
Non-Periodic Signal File:NP Non-Periodic Signal turned Periodic Y=X File:NPTP
