| Line 1: | Line 1: | ||
Time dependent changes- | Time dependent changes- | ||
1. Time delay- | 1. Time delay- | ||
| − | In simple terms you are shifting the original signal by a factor. For eg. | + | In simple terms you are shifting the original signal by a factor. |
| + | For eg. | ||
[[File:Graph1.1.PNG|Time shift example]] | [[File:Graph1.1.PNG|Time shift example]] | ||
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2. Time scaling- | 2. Time scaling- | ||
| − | |||
[[File:Graph1.2.PNG|amplitude scaling graph example]] | [[File:Graph1.2.PNG|amplitude scaling graph example]] | ||
| − | The change in graph depends on the value of a. If |a|>0, then the height increases, else it decreases. | + | In simple terms you are shifting the height/width of the graph of a signal. The change in graph depends on the value of a. If |a|>0, then the height increases, else it decreases. |
3. Time reversal- | 3. Time reversal- | ||
| + | [[File:Graph1.3.PNG|time reversal]] | ||
When you negate the independent variable, the graph of the dependent variable changes to a mirror image of the original graph. | When you negate the independent variable, the graph of the dependent variable changes to a mirror image of the original graph. | ||
| − | |||
| − | |||
Revision as of 20:59, 1 December 2018
Time dependent changes-
1. Time delay- In simple terms you are shifting the original signal by a factor. For eg.
In this example as you can see, a simple way of understanding time shift/delay is by looking at how the graph changes when you want a shift in the signal.
2. Time scaling-
In simple terms you are shifting the height/width of the graph of a signal. The change in graph depends on the value of a. If |a|>0, then the height increases, else it decreases.
3. Time reversal-
When you negate the independent variable, the graph of the dependent variable changes to a mirror image of the original graph.
