Name: 【TED】Harald Haas: Wireless data from every light bulb (Wireless data from every light bulb | Harald Haas)
Uploaded: 2015-12-18T09:43:49.000Z
Duration: 12 min 52 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...

that we have 1.4 million cellular radio masts

we transmit more than 600 terabytes of data

We use it everyday. We use it in our everyday lives now --

in our private lives, in our business lives.

And we even have to be asked sometimes, very kindly,

to switch off the mobile phone at events like this

because it's so fundamental to our lives.

The way we transmit wireless data is by using electromagnetic waves --

with the demand of wireless data transmissions

and the number of bytes and data which are transmitted every month.

And we are simply running out of spectrum.

These 1.4 million cellular radio masts, or base stations,

Then the efficiency of such a base station

Then there's another issue that you're all aware of.

These radio waves penetrate through walls.

and somebody can make use of your network

And light is part of the electromagnetic spectrum.

of the entire electromagnetic spectrum, where we have gamma rays.

You don't want to get close to gamma rays, it could be dangerous.

but otherwise dangerous for the human body.

And then we have the radio waves, they have the issues I've just mentioned.

And in the middle there, we have this visible light spectrum.

and light has been around for many millions of years.

And wouldn't it be great to use that for wireless communications?

Not only that, I compared [it to] the entire spectrum.

with the size of the visible light spectrum.

We have 10,000 times more of that spectrum,

So not only do we have this huge amount of spectrum,

let's compare that with a number I've just mentioned.

inefficient radio cellular base stations.

14 billion is the number of light bulbs installed already.

Look at the ceiling, you see all these light bulbs.

Go to the main floor, you see these light bulbs.

Subtitles ListPlay Video

【TED】Harald Haas: Wireless data from every light bulb (Wireless data from every light bulb | Harald Haas)

lead

subtle

switch

spectrum