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True noise cancelling headphones are more expensive than traditional noise absorbing headphones. How do noise cancelling...

True noise cancelling headphones are more expensive than traditional noise absorbing headphones.

  • How do noise cancelling headphones work that makes them more expensive than noise absorbing headphones?
  • What is another application for noise cancelling technology? Be specific about how your application will work.
Science   Advanced-Physics   
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Answer #1

True noise cancelling headphones uses the concept of destructive interference of sound waves to cancel the noise from the surroundings.

The outer noise can be interpreted as a usual signal which can be decomposed into superposition of multiple sines and cosine signals. If a sound containing similar frequency is emitted from headphones with a lag of half the wavelength, the signals will destructively interfere causing no sound to enter the user's ears thereby cancelling the outer noise. This component which in real-time sends out the signal to cancel the noise is what makes these headphones expensive than the regular noise absorbing headphones.

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