There are commercial products available called active noise cancellers, which consist of a set of headphones, microphone, and some electronics. Intended for wearing in noisy environments where the user must still be able to hear (for example, radio communications), the headphones reduce noise far beyond the simple acoustic isolation of the headphones. How does such a product work?
2007-05-02 01:24:12 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
sound travels in waves, and sound waves can be combined to form a composite wave, which is basically the addition of all the sound waves added together.
noise cancellers simply modify the sound being canceled by shifting it 180 degrees in phase, which makes it the exact opposite of the sound being cancelled. when the two waves are added together, the net result is no sound.
hope this helps
2007-05-02 01:30:33 · answer #1 · answered by engineeringguru 2 · 0⤊ 0⤋
The circuit receives the outside noise through a microphone, amplifies reverses the phase on it. Where the noise produces a crest in the noise, the earphones produce a valley of pressure thus canceling it out.
2007-05-02 01:28:37 · answer #2 · answered by Gene 7 · 0⤊ 0⤋
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2016-11-24 20:22:40 · answer #3 · answered by Anonymous · 0⤊ 0⤋