Designing delay elements

Discussion in 'Homework Help' started by kidkwik, May 23, 2011.

  1. kidkwik

    Thread Starter New Member

    Oct 13, 2010
    3
    0
    How would one go about designing a delay element for a specific range of frequencies with less than a certain amount of error in the gain and phase?

    I was thinking of bandpass filter, but i'm not sure if that is considered a delay element.
     
  2. Georacer

    Moderator

    Nov 25, 2009
    5,142
    1,266
    What are you trying to delay? Specific frequency signals by an amount of time, or by a specific phase delay?
     
  3. steveb

    Senior Member

    Jul 3, 2008
    2,433
    469
    You actually need an "allpass" filter. The allpass filter tries to keep a nearly unity magnitude over a broad frequency range. Then a nearly linear phase shift vs. frequency (over some band) gives an effective time delay.

    http://www.linkwitzlab.com/filters.htm

    Georacer's questions are very relevant, by the way. Depending on your answers, the above link might be helpful. Or, perhaps a simple small transmission line is all you need. Or, maybe you need a digital filter implementation.
     
  4. kidkwik

    Thread Starter New Member

    Oct 13, 2010
    3
    0
    Thank you both for the replies, but the question is pretty vague.

    Design a delay element for a range of 0 < f <10 Hz, with less than
    1 % error in the phase and gain.

    Yeah, it's suppose to be a digital filter.
     
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