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)?

Printable View

- Jan 2nd 2011, 12:02 AMTechnicianEngineerExpress this sequence as a unit step function (discrete)
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)? - Jan 2nd 2011, 10:01 PMsnowtea
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) - Jan 3rd 2011, 03:31 AMTechnicianEngineer
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 - Jan 3rd 2011, 06:31 AMsnowtea
Yes, you are absolutely right on that. Silly me :)

But I'm glad you got the concept.