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Human voice: Wavelength to frequency

  1. Feb 17, 2009 #1
    With reference to the formula:

    distance (wavelength) = k / frequency

    what does a wavelenght of 1176470.58 signify with regards to the fundamental frequency of a typical adult female being between 165 to 255 Hz, where

    d = 300/.000255 = 1176470.58

    Would greatly appreciate advise.

    Best regards,
  2. jcsd
  3. Feb 17, 2009 #2


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    Science Advisor

    Where did you get those numbers and where did you get that equation?

    Your equation is wrong because velocity is the product of wavelength and frequency. Your "k" is velocity.

    If you take the speed of sound for a typical day to be 332 m/s and using an average frequency of 200 Hz, that equates to wavelength of 1.66 m.
  4. Feb 17, 2009 #3
    It signifies that you are using the speed of light instead of the speed of sound for k.
  5. Feb 18, 2009 #4
    Appreciate the advise.

    I put forth a follow-up concluding query below:

    Why do the usable voice frequency band in telephony range from approximately 300 Hz to 3400 Hz when the voiced speech of a typical adult human have a fundamental frequency from 85 to 255 Hz?

    Look forward to your advise.

    Best regards,

    P.S. My information source is http://en.wikipedia.org/wiki/Voice_frequency
  6. Feb 18, 2009 #5


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    Staff: Mentor

    Is this for homework or coursework? If so, we can move this thread for you to the Homework Help forums.

    What are your thoughts about why the reduced frequency range was chosen for wired telephone communication? What advantages would there be to raising the minimum frequency transmitted, and lowering the maximum? Why didn't they narrow the frequency range even more?
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