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Figure 2.6 sq (t) is a periodic signal like the sinusoid. It too has an amplitude and a period, which must be specifed to characterize the signal. We find subsequently that the sine wave is a simpler signal than the square wave.
![media/image38.png](http://www.opentextbooks.org.hk/system/files/resource/9/9648/9671/media/image38.png)
Figure 2.6 The square wave
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