Thread: 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

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.