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Sennheiser PXC 550-II $289.99 at Amazon. Sennheiser PXC 550-II $299.99 at Walmart. True Wireless Sony WF-1000XM4. The WF-1000XM4 is the latest in Sony’s line of noise-canceling true wireless ...
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The noise cancellation on the XM4 is about that same as the 700, blocking out deep bass and loud muffling from cars, planes, and more. The sound quality of the XM4 is also elite, with clear audio ...
The primary reason other people don't hear the "counter/anti-" noise is because the sound generated by the headphones is specifically designed to cancel out the ambient noise that has made it into the headphone. The wave forms of the intruding ambient sound and the counter-noise cancel out and there is none for other people to hear.
A noise-cancellation speaker emits a sound wave with the same amplitude but with an inverted phase (also known as antiphase) relative to the original sound. The waves combine to form a new wave, in a process called interference, and effectively cancel each other out – an effect which is called destructive interference.
A microphone captures the targeted ambient sounds, and a small amplifier generates sound waves that are exactly out of phase with the undesired sounds. When the sound pressure of the noise wave is high, the cancelling wave is low (and vice versa). The opposite sound waves collide and are eliminated or "cancelled" (destructive interference ...
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