Continuous Time

Let’s say we have:

  • Signal
  • Signal , which is delayed by seconds

Thus:

and

If , it is delayed (shift to the right) If , it is advanced (shift to the left)

Discrete Time

Like C.T., we have:

To shift a discrete time signal by units, we replace with . If , it is delayed (shift to the right) If , it is advanced (shift to the left)