complex waveforms

Discussion in 'Homework Help' started by racerx, Jan 8, 2005.

  1. racerx

    Thread Starter New Member

    Jan 8, 2005
    7
    0
    Hi,
    I've been trying to construct a triangular waveform using excel. This is part of an assignemnt i'm doing, in which i've already constructed a squarewave and sawtooth waveform.

    The formula i've been using to try and create this triangular wave is shown below:-

    v= Vsin(wt)+ v/9sin(3wt-pi)+V/25sin(5wt-pi)...... and so on.

    I'm pretty sure this is wrong as i've read that alternate odd harmonics must be in antipahse with the fundamental.

    Can someone please provide a sensible formula for creating a triangular wave, i've looked on the net but there isn't much information!!

    Thanks
    Matt
     
  2. Brandon

    Senior Member

    Dec 14, 2004
    306
    0
    A triangular wave is nearly the exact same as a square wave with different coefficients.

    http://rds.yahoo.com/S=2766679/K=%2Bfourie...s/srfourtr.html
     
  3. racerx

    Thread Starter New Member

    Jan 8, 2005
    7
    0

    I'm afriad that for some reason I can't see the program that the link takes you to! I don't know if i havn't got right software to see the stuff. My java is upto date so I dunno what could be wrong!!

    Thanks
     
  4. racerx

    Thread Starter New Member

    Jan 8, 2005
    7
    0



    The information i was given by brandon wasn't what I was looking for, so if anyone can help I still need it.

    The link to the formula brandon provided was good but I need something that includes a fundamental frequency. This is due to my assignment being based on a fundamental of 130 hz.

    Thanks
    Matt
     
  5. racerx

    Thread Starter New Member

    Jan 8, 2005
    7
    0

    Well thanks for any replies I did get, but i've sorted it now. If anyone is actually interested the correct formula is V= Vsin(wt) + V/3^2 Sin(3wt-pi) + v/5^2 Sin(5wt)+ V/7^2 sSin(7wt-pi)... and so on

    Just means that the harmonics must alternate in phase with the fundamental.

    Cheers :eek:)
     
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