difference between these graphs

Discussion in 'Homework Help' started by s3b4k, Jun 11, 2011.

  1. s3b4k

    Thread Starter Member

    Feb 15, 2010
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    does anyone know whats the difference between these two and what is this alteration, like the first 1000 samples are the same but the rest is diffrent and what should i do to make these two look very similar to each other, i applied low pass, bandpass, bandreject and high pass and it doesnt change the shape of the signal. Also when i plot in frequency domain the second signal has a much high magnitude then the original
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,645
    2,344
    Hello,

    Did you have a close look at the signals?

    [​IMG]

    In the second graph there are pretty stong pulses.

    Bertus
     
  3. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    Have you tried subtracting one from the other to see what the difference is?
     
    s3b4k likes this.
  4. someonesdad

    Senior Member

    Jul 7, 2009
    1,585
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    Apply the same filter you'd use to make a 1956 Buick look like a 2009 Corvette. :p

    Sorry, couldn't help being flippant -- but those signals are distinctly different. What gives you the idea that one can be (easily) converted into the other via filtering? If this is a homework assignment, you should fully state the problem.
     
  5. s3b4k

    Thread Starter Member

    Feb 15, 2010
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    0
    okay i subtracted the two graphs and they look the same except one is shifted 1000 samples, does anyone know how i can shift the graph to the left 1000 samples in matlab. should i convolve it with a delta function? here is a picture third one is the two top graphs subtracted each other.

    edit i managed to shift the signal to the left using a for loop, now 1000 samples at the end are gone how do i get those
     
    Last edited: Jun 12, 2011
  6. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    Don't know if this is helpful, but I think this is a block diagram of what I see in post #5.
     
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