Name: How Noise-Canceling Headphones Work
Uploaded: 2020-10-28T18:26:27.000Z
Duration: 4 min 28 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

noise-canceling headphones will drown out

You've probably seen noise-canceling headphones

become pretty widespread over the last decade or so.

He became frustrated that the noise of the plane

through the electronic headsets on the flight.

which has become synonymous with noise-canceling headphones.

and millions of dollars in research for that to happen.

By 1986, almost 10 years after his fateful flight,

which soon became a product for airline pilots,

And while you listen to things through the speakers,

See, every sound travels in the form of a wave,

This is a sound wave of me saying "hello."

Now, if you played both sounds at the same time,

you'd get a phenomenon called constructive interference.

Constructive interference amplifies sound

It's the same phenomenon you get in a crowded restaurant.

As more people come in and start talking,

But what if instead of becoming a louder sound,

In fact, it became so quiet, it was almost silent?

Let's go back to those sound waves from before.

See, sound waves, like light waves, have peaks and valleys.

And when the headphone's microphone detects a sound wave,

What results is the canceling part of noise-canceling.

The waves cancel each other out, and a flat line ensues.

Now, if you've used noise-canceling headphones before,

Some other noises leak through sometimes,

You can only eliminate so many sounds at once.

And some headphones will be better than others.

While a $50 pair may not eliminate noises

Even if they don't achieve perfect silence every time,

there's no doubt noise-cancellation technology

has been a useful way to help people get through

It looks like the $50 million Bose spent back then

Subtitles ListPlay Video

How Noise-Canceling Headphones Work

eventually

phenomenon

eliminate

concept