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Using the CT signal <math> x(t) = cos(t) </math> and converting it to the DT signal <math> x[n] = cos[n] </math> will create a non-periodic function when n is sampled at every integer. | Using the CT signal <math> x(t) = cos(t) </math> and converting it to the DT signal <math> x[n] = cos[n] </math> will create a non-periodic function when n is sampled at every integer. | ||
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=== Periodic Discrete Time Signal === | === Periodic Discrete Time Signal === | ||
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| + | === Creating a Periodic from a Non-Periodic Function === | ||
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| + | Using <math> x(t) = \frac{sin(t)}{t} </math>, which is a non-periodic function, we can create a periodic function by repeating the original function <math> x(t) </math> from <math> t = [0,4] </math> an infinite number of times. | ||
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Latest revision as of 10:07, 10 September 2008
Contents
Part A: Periodic Signals Revisited
Periodic Continuous Time Signal
I used the continuous time signal $ x(t) = cos(t) $, as it seemed many people used in Homework 1 for their example of a periodic function. The signal repeats itself at intervals of $ 2\pi $.
Non-Periodic Discrete Time Signal
Using the CT signal $ x(t) = cos(t) $ and converting it to the DT signal $ x[n] = cos[n] $ will create a non-periodic function when n is sampled at every integer.
Periodic Discrete Time Signal
In order to create a discrete time signal $ x[n] = cos[n] $ that was still periodic, the time interval couldn't be integers, as shown previously. Therefore, a time interval of $ \pi/2 $ was selected.
Creating a Periodic from a Non-Periodic Function
Using $ x(t) = \frac{sin(t)}{t} $, which is a non-periodic function, we can create a periodic function by repeating the original function $ x(t) $ from $ t = [0,4] $ an infinite number of times.
