Those who have invented the headphones for the people who are obsessed about the sound quality of their music have thought that those headsets can serve another function as well, that of offering a blessed quiet or, at least, a relative quiet compared to what airplane noise sounds like without them. To wear “noise-cancelling headsets” is not the same thing as sticking earplugs in your ears. Engineers have thought about a way to create a “counter-noise” that drowns out a steady low frequency hum. You have just to push the switch on the battery-operated mechanism, and a sound that you cannot hear will attack the noise that bothers you. That can also make music sound better.
This new technology has the idea that unwanted low-frequency noise can be eliminated by adding phase-inverted anti-noise at its base. Small microphones that are usually in the ear cups pick up the noise around you. The headsets’ electronics generate an identical signal but a 180° phase-inverted one. The two noise signal waves cancel each other out.
The system works and is very appreciated. It cannot eliminate voices or sporadic or high frequency noise. In a plane, one can hear the cabin attendants and loudspeaker announcements, but the headsets cut the sound of neighbors’ blabbing, and the screaming of the kids. The system can really stifle engine noise. At this point, there are three kinds of headphones: one fits over the ear opening, one covers the entire ear, and the third one fits inside the ear canal. One should try them all, before choosing to buy one. They all have advantages and disadvantages, just as one can consider earplugs annoying and irritating after long use.
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