![](https://www.opentextbooks.org.hk/sites/opentextbooks/files/book_profile/cc_icon/by-sa.png)
Available under Creative Commons-ShareAlike 4.0 International License.
Figure 2.5 describes turning a unit-amplitude signal on for a duration of Δ seconds, then turning it off.
![media/image37.png](/system/files/resource/9/9648/9670/media/1.png)
Figure 2.5 The pulse.
We will find that this is the second most important signal in communications.
- 瀏覽次數:1386