# Simple ear-protection devices use materials that reflect or absorb sound before it reaches the ears. A newer technology, sometimes called noise cancellation, uses a microphone to produce an electrical signal that mimics the noise. The signal is modified electronically, then fed to the speakers in a pair of headphones. The speakers emit sound waves that cancel the noise. On what principle is this technology based? What kind of modification is made to the electrical signal?

Simple ear-protection devices use materials that reflect or absorb sound before it reaches the ears. A newer technology, sometimes called noise cancellation, uses a microphone to produce an electrical signal that mimics the noise. The signal is modified electronically, then fed to the speakers in a pair of headphones. The speakers emit sound waves that cancel the noise. On what principle is this technology based? What kind of modification is made to the electrical signal?
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Solution:
The noise cancellation device use the idea that the electric signal minimize the noise that is modified electronically to produce a wave that is out of phase with the noise.
Result:
The electric signal minimize the noise that is modified electronically to producea wave that is out of phase with the noise.