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Math Help - Periodic signal problem

  1. #1
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    Question Periodic signal problem

    Determine following signal is periodic if a signal is periodic,specify its fundamental period.
    Periodic signal problem-x2.gif

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

    Thank you
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  2. #2
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    Re: Periodic signal problem

    Quote Originally Posted by gain8823 View Post
    Determine following signal is periodic if a signal is periodic,specify its fundamental period.
    Click image for larger version. 

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    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.
    Thanks from gain8823
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  3. #3
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    Re: Periodic signal problem

    Periodic signal problem-xxx.png
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  4. #4
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    Re: Periodic signal problem

    Quote Originally Posted by gain8823 View Post
    Click image for larger version. 

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    That's the point in case 2. You can't. It's not periodic.
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