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Why is a periodic function Time Variant?

  1. Jul 3, 2017 #1
    I hope you can help me.
    I cant understand why periodic function is Time Variant.

  2. jcsd
  3. Jul 3, 2017 #2


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    Because it does not take the same value for all times.
  4. Jul 3, 2017 #3


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    The definition of periodic means occuring at intervals of time.
  5. Jul 5, 2017 #4
    In my opinion, a periodic function is a time variant system if the considered time is in the limits of the periodic time constant.
    However, since a different input value produces a same output value if the time difference is a multiple of time constant you may consider a periodic function as a "limited time variant”.
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