The CT signal $ \cos{x} $ can be both periodic and non-periodic in DT.

With a sampling rate of $ 1 $ the DT signal looks like this:

Nonperiodic ECE301Fall2008mboutin.jpg

and is non-periodic.

With a sampling rate of $ \frac{\pi}{2} $ the DT signal looks like this:

Periodic2 ECE301Fall2008mboutin.jpg

and is periodic.

Alumni Liaison

Ph.D. 2007, working on developing cool imaging technologies for digital cameras, camera phones, and video surveillance cameras.

Buyue Zhang