express the sequence {0,...,0,-1,-1,-1,-1,0(origin),0,0,0...,0} in terms of a. scaled/shifted impulses is the answer b. unit step function is the answer x(n) = -u(-(n+5))-u(-n)?
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For (a), I believe you are correct. For (b), consider the simple sequence y ...,0,0(origin),1,1,1,1,0,0,... y(n) = u(n) - u(n-5) Now x(n) = -y(-n) = -u(-n) + u(-n-5)
no you are wrong on (b) it's suppossed to be {0,0,0(origin),1,1,1,1,0,0} ==> y(n) = u(n-1)-u(n-5) Now -y(-n) = -u(-n-1)) + u(-n-5)) clarify me pls
Last edited by TechnicianEngineer; Jan 3rd 2011 at 05:23 AM.
Yes, you are absolutely right on that. Silly me But I'm glad you got the concept.
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