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A special device can transmit out-of-phase sound from a noisy jackhammer to earphones

  1. Feb 13, 2008 #1
    Noisy Jackhammer man...has special headphones so he can hear you, you cannot hear him

    My physics teacher wants us to answer this "A special device can transmit out-of-phase sound from a noisy jackhammer to earphones worn by its operator. Over the noise of the jackhammer, the operator can easily hear your voice while you are unable to hear his, Explain." Now I thought the headphones focused in on a persons voice and cancelled the jackhammer...?
     
    Last edited: Feb 13, 2008
  2. jcsd
  3. Feb 13, 2008 #2
    Hello?
     
  4. Feb 13, 2008 #3
    Hello? Anyone There?
     
  5. Feb 13, 2008 #4

    chroot

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    Uh.. the noise is cancelled at his ears, not yours.

    - Warren
     
  6. Feb 13, 2008 #5
    thanks
     
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