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To reduce unwanted surrounding sounds (such as noise), through active noise control (
Noise-cancelling headphones Typically used to eliminate the lower frequency parts of the noise, they rely on more traditional methods such as sound isolation to prevent high frequency noise from reaching the ears. This method is preferred because it reduces the complexity of electronic circuits that are involved in Higher frequencies will require noise cancellation, where active cancellation is less effective.
Limitations
Over-ear headphones completely enclose the wearer's ears. This provides passive noise isolation and noise cancellation circuitry so that electronics can perform better.
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Supply NC4418 headphone chip SYNOXO series F113