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Math Help - Signal Sampling of difference equation

  1. #1
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    Angry Signal Sampling of difference equation

    Hi all,

    i have an exam revision question to do, that i need some advice on:

    a system is described by y(n)=0.1x(n)-0.2(n-1)+0.3y(n-1)
    i) calculate the first five non-zero output samples produced by the input:
    x(n)={....,0,-0.1,0.2,-0.3,0...}

    I know how to calculate the answers and that n=0 at -0.1

    my question is: as the question asks for the first 5 non-zero outputs

    which inputs should i use to get use?

    how does the sequence repeat itself

    x(n)={....,0,-0.1,0.2,-0.3,0.,0,-0.1,0.2,-0.3,0...} one zero
    x(n)={....,0,-0.1,0.2,-0.3,0,-0.1,0.2,-0.3,0...} two zero
    Thanks

    Ian


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  2. #2
    Super Member ILikeSerena's Avatar
    Joined
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    Re: Signal Sampling of difference equation

    You would need more information.
    Is this the complete problem statement?

    Is the period of the input signal given?
    Does it have a period?

    Furthermore, your input x(n)={....,0,-0.1,0.2,-0.3,0...} is faulty in notation as far as I'm concerned.
    There is no comma after the last zero, making it ambiguous what that last zero means.
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