Results 1 to 2 of 2

Math Help - given a function of wave, how to find the equation of a lower pass filter

  1. #1
    Senior Member
    Joined
    Feb 2008
    Posts
    321

    given a function of wave, how to find the equation of a lower pass filter

    a unit amplitude square wave f(t)=1 for 0<t<T, and f(t)=-1 for -T<t<0.

    there is a system which permits angular frequencies < 4 pi/T to be transmitted and >4pi/T to be absorbed.

    how to find the form of lower pass filter?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by szpengchao View Post
    a unit amplitude square wave f(t)=1 for 0<t<T, and f(t)=-1 for -T<t<0.

    there is a system which permits angular frequencies < 4 pi/T to be transmitted and >4pi/T to be absorbed.

    how to find the form of lower pass filter?
    What are you supposed to know? How sharp a cut off do you need?

    Why not use an appropriately truncated Fourier series (which can be represented as a convolution in the time domain)?

    CB
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: October 14th 2010, 04:06 AM
  2. Box filter and box function?
    Posted in the Calculus Forum
    Replies: 1
    Last Post: August 18th 2010, 02:01 PM
  3. Low pass filter
    Posted in the Advanced Applied Math Forum
    Replies: 17
    Last Post: February 29th 2008, 03:59 AM
  4. High Pass Filter Signal analysis! HELP HELP!!
    Posted in the Advanced Applied Math Forum
    Replies: 1
    Last Post: February 25th 2008, 04:34 AM
  5. High pass filter and signal
    Posted in the Advanced Applied Math Forum
    Replies: 2
    Last Post: September 25th 2007, 01:17 PM

Search Tags


/mathhelpforum @mathhelpforum