(New page: == Part D: Time Invariance == When a system is time invariant, any time shifting on the input signal will result in the same shifting of the output signal.) |
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When a system is time invariant, any time shifting on the input signal will result in the same shifting of the output signal. | When a system is time invariant, any time shifting on the input signal will result in the same shifting of the output signal. | ||
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| + | In other words (pictures), | ||
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| + | [[Image:Partd1_ECE301Fall2008mboutin.JPG]] | ||
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| + | implies | ||
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| + | [[Image:Partd2_ECE301Fall2008mboutin.JPG]] | ||
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| + | === Example of a Time-Invariant System === | ||
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| + | An example of a time-invariant system is <math> x(t) = \frac{1}{t} </math>. | ||
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| + | As you can see from the graph, <math> y</math><sub>2</sub><math>(t)</math> (the blue dotted graph) is the same graph of </math><sub>1</sub><math>(t)</math> (the green graph), but shifted to the right by <math>t</math><sub>0</sub><math>=2</math>. | ||
| + | [[Image:Untitled6_ECE301Fall2008mboutin.jpg]] | ||
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| + | === Example of a System That Is Not Time-Invariant === | ||
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| + | An example of a system that is not time-invariant would be <math> x(t) = (1-t)*(t-1) </math>. | ||
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| + | The graph below shows that the resulting signal is not a shifted input signal. | ||
| + | [[Image:Untitled7_ECE301Fall2008mboutin.jpg]] | ||
Latest revision as of 15:25, 10 September 2008
Part D: Time Invariance
When a system is time invariant, any time shifting on the input signal will result in the same shifting of the output signal.
In other words (pictures),
implies
Example of a Time-Invariant System
An example of a time-invariant system is $ x(t) = \frac{1}{t} $.
As you can see from the graph, $ y $2$ (t) $ (the blue dotted graph) is the same graph of </math>1$ (t) $ (the green graph), but shifted to the right by $ t $0$ =2 $.
Example of a System That Is Not Time-Invariant
An example of a system that is not time-invariant would be $ x(t) = (1-t)*(t-1) $.
The graph below shows that the resulting signal is not a shifted input signal.
