Learn How to Sketch a Signal with Step-by-Step Instructions

[zee3b]

Sketch the following signal

u(t-3)-2u(t-8)+u(t-5)

if it was u(t-3)+u(t-5) I'd be able to sketch it, but the 2u(t-8) is confusing me
help me :(

I can draw the first part u(t-3) how do I add the second to the graph and then the third

 

[LCKurtz]

Take the 3, 5, and 8 terms in order. Start by drawing u(t-3). Then add u(t-5). You said you already can do that. Now just subtract 2u(t-8). You just add graphs by adding their ordinates.

 

[zee3b]

Take the 3, 5, and 8 terms in order. Start by drawing u(t-3). Then add u(t-5). You said you already can do that. Now just subtract 2u(t-8). You just add graphs by adding their ordinates.

Thanks a lot, but I am confused on the 2u part. I can draw u(t-3) and u(t-5) but what is 2u? I'm used to u's

 

[LCKurtz]

Thanks a lot, but I am confused on the 2u part. I can draw u(t-3) and u(t-5) but what is 2u? I'm used to u's

You multiply u(t) by 2, so its values are 0 and 2.

 

[zee3b]

hey so this is my rough sketch of the first and last part how exactly will i fit in the -2u(t-8) in this. I did it in paint lol :( I'm a total noob but in the process of learning more help will be appreciated

 

[zee3b]

hey I was trying to work on it more, is it by any chance something like this

 

[LCKurtz]

Ta Daa! He gets it!

 

[zee3b]

Thanks <3