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Calculate the frequency of a sound .wav

  1. Apr 28, 2010 #1
    Hello all,
    First of all I am new here and I don`t know if this thread is posted corectly.
    I need to calculate the frequency of a sound .wav
    I found a formula freq= (velocity / wavelength).
    My question is: What is velocity and wavelength.Can someone please help?
    Thanks
     
  2. jcsd
  3. Apr 28, 2010 #2

    Dale

    Staff: Mentor

    Re: wavelength

    Hi inisca, welcome to PF

    If you have a .wav file you can calculate the frequency directly. If the file is a single pure tone simply count n the number of samples between successive 0 crossings and divide 44.1/n to get the frequency in kHz. If the file is a mix of tones then you will need to do a Fourier transform.
     
  4. Apr 28, 2010 #3
    Re: wavelength

    1. Why 44.1/n , what is 44.1?
    2. does it help me if I know the audio sample rate ?
     
  5. Apr 28, 2010 #4

    jtbell

    User Avatar

    Staff: Mentor

    Re: wavelength

    44.1 kHz is the audio sample rate on a CD. If the .wav file was ripped directly from a CD, then its sample rate is 44.1 kHz. If it comes from some other source, it may have a different sample rate.
     
  6. Apr 28, 2010 #5

    Dale

    Staff: Mentor

    Re: wavelength

    Oh, yeah, thanks for mentioning that. I was assuming a .wav file ripped from CD. That may not have been a good assumption.
     
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