1. ## Periodic signal problem

Determine following signal is periodic if a signal is periodic,specify its fundamental period.

In the class I just learn sin,cos signal
In H.w. complex exponential signal.....
and without fourier transform
I need solution

Thank you

2. ## Re: Periodic signal problem

Originally Posted by gain8823
Determine following signal is periodic if a signal is periodic,specify its fundamental period.

In the class I just learn sin,cos signal
In H.w. complex exponential signal.....
and without fourier transform
I need solution

Thank you
$e^{(-1+\jmath)t}=e^{-t}e^{\jmath t}$

$e^{\jmath t}=\cos(t)+\jmath \sin(t)$

That should be all you need to determine if $x(t)$ is periodic or not.

4. ## Re: Periodic signal problem

Originally Posted by gain8823
That's the point in case 2. You can't. It's not periodic.