Signal Problem

Discussion in 'Math' started by crazyengineer, Jun 26, 2011.

  1. crazyengineer

    Thread Starter Member

    Dec 29, 2010
    156
    2
    Hello! I need some help understanding this signal the signal is

    x(t)u(1-t)
    [​IMG]

    I understand that
    u(1-t){0 t>1, 1 t<=0}

    But I do not understand why it's zero at -1. Is it because x(t){0 t<0, 1 t>=0}
     
  2. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,795
    951
    You are multiplying by a term called (1-t)
    Multiplication by zero is always zero.
    what is the value of 't' when the term (1-t) is zero?
     
    crazyengineer likes this.
  3. Georacer

    Moderator

    Nov 25, 2009
    5,142
    1,266
    Is this question about finding the signal x(t) based on the graph of x(t)u(1-t)? Is x(t) an uknown?

    If so remember that u(1-t) is 0 for t>1 and 1 for t<1; it is different from what you wrote.

    I guess your job is to find x(t) based on that.
     
  4. lopoditi

    New Member

    Jul 24, 2011
    6
    1
    it is zero at -1 because this is what x(-1) is.
     
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