Name: 降噪耳機如何工作？ (How Noise-Canceling Headphones Work)
Uploaded: 2020-10-28T18:26:43.000Z
Duration: 4 min 28 s

noise-canceling headphones will drown out

You've probably seen noise-canceling headphones

become pretty widespread over the last decade or so.

在過去的十幾年裡變得相當普遍。

這時，阿瑪爾-博斯博士坐上了飛機

He became frustrated that the noise of the plane

through the electronic headsets on the flight.

現在，Bose的名字可能聽起來很熟悉。

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,

到1986年，在他的致命飛行近10年後。

which soon became a product for airline pilots,

很快就成為航空公司飛行員的產品。

And while you listen to things through the speakers,

而當你通過揚聲器聽東西的時候。

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

你看，每個聲音都是以波的形式傳播的。

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

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

現在，如果你同時演奏這兩種聲音。

you'd get a phenomenon called constructive interference.

你會得到一種叫做建設性干擾的現象。

Constructive interference amplifies sound

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

這和你在人多的餐廳裡的現象是一樣的。

As more people come in and start talking,

隨著越來越多的人進來，開始說話。

But what if instead of becoming a louder sound,

但如果不是變成更響亮的聲音呢。

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

事實上，它變得非常安靜，幾乎無聲無息?

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

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

你看，聲波和光波一樣，也有波峰和波谷。

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

而當耳機的麥克風檢測到聲波時。

所以每一個山谷都有一個高峰。

What results is the canceling part of noise-canceling.

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

浪潮相互抵消，隨之而來的是一條平線。

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

現在，如果你以前用過降噪耳機。

Some other noises leak through sometimes,

在其他情況下，隨著變化太大。

You can only eliminate so many sounds at once.

And some headphones will be better than others.

而有些耳機會比其他耳機更好。

While a $50 pair may not eliminate noises

雖然50美元的一對可能無法消除噪音

它可能是足夠好的，以滿足您的需求。

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

即使他們並不是每次都能達到完美的沉默。

there's no doubt noise-cancellation technology

has been a useful way to help people get through

一直是幫助人們渡過難關的有效途徑。

It looks like the $50 million Bose spent back then

看來，Bose當年花的5000萬美金。

字幕列表影片播放

降噪耳機如何工作？ (How Noise-Canceling Headphones Work)

eventually

phenomenon

eliminate

concept