HaraldHaas_2015G[Harald Haas][“光带”无线网络的新突破].pdf

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1、www.XiYuS锡育软件I would like to demonstrate for the first time in public that itis possible to transmit a video from a standard off-the-shelfLED lamp to a solar cell with a laptop acting as a receiver.我想要第一次向公众证明 视频可以 由一台LED台灯 传送至太阳能电池板上,并由一台手提电脑接收00:12There is no Wi-Fi involved,its just light.没有Wi-Fi介

2、入,只是光00:30And you may wonder,whats the point?那么你可能想知道,这样做有什么意义？00:33And the point is this:There will be a massive extension of theInternet to close the digital divide,and also to allow for whatwe call The Internet of Things-tens of billions of devicesconnected to the Internet.意义就是:将来互联网会大规模覆盖“数字鸿沟“将

3、不复存在 并且让我们所说的“物联网”变为可能 数以亿计的设备连接到互联网00:35In my view,such an extension of the Internet can only work ifits almost energy-neutral.在我看来,互联网的大程度扩张 前提是需要基本保证“能源中性化”（指尽量减少能源消耗）00:51This means we need to use existing infrastructure as much aspossible.这就是说,我们需要尽可能的多用现存的基础设施00:58And this is where the solar c

4、ell and the LED come in.这就是为什么前面提到太阳能电池和LED01:03I demonstrated for the first time,at TED in 2011,Li-Fi,orLight Fidelity.我之前第一次证明这件事 是2011年在TED演讲 我称它为Li-Fi,即光保真01:08off-the-shelf:adj.现成的;常备的;成品的/adv.现成地;无需作重大修改地 lamp:n.灯;照射器/vt.照亮/vi.发亮 Wi-Fi:abbr.无线保真技术(wirelessfidelity);无线上网技术 allow for:考虑到,虑及 demo

5、nstrated:演示 Fidelity:n.保真度;忠诚;精确;尽责Li-Fi uses off-the-shelf LEDs to transmit data incredibly fast,and also in a safe and secure manner.用现存的LED灯可以极快地传递Li-Fi数据 并且这种方式安全可靠01:15Data is transported by the light,encoded in subtle changesof the brightness.数据由光传输 由亮度的细微变化解码01:25If we look around,we have man

6、y LEDs around us,so theres arich infrastructure of Li-Fi transmitters around us.如果我们环视四周,在我们身边有很多的LED灯 因此在我们周围有着非常丰富的Li-Fi发射装置01:32But so far,we have been using special devices-small photodetectors,to receive the information encoded in the data.但是目前,我们通常使用一个特别的设备小型照片探测器 来接收由数据解码出来的信息01:41I wanted to

7、 find a way to also use existing infrastructure toreceive data from our Li-Fi lights.我想要找到一种方法,利用现有的基础设施 来接收Li-Fi灯发出的数据01:50And this is why I have been looking into solar cells and solarpanels.这也是为什么我一直研究太阳能电池和太阳能电板01:58A solar cell absorbs light and converts it into electricalenergy.太阳能电池吸收光并转化成电能0

8、2:03This is why we can use a solar cell to charge our mobilephone.这就是为什么我们能用太阳能电池给我们的手机充电02:08LEDs:v.领导;通向;指引(lead的过去分词)transported:v.植运输;搬运(transport的过去式)encoded:adj.计编码的/v.把编码(encode的过去分词)brightness:n.光天亮度;聪明,活泼;鲜艳;愉快 transmitters:n.信号传送器;传送者(transmitter的复数形式)detectors:n.探测器;侦测设备(detector的复数)panel

9、s:n.面板(panel的复数);建嵌板;事务委员会/v.嵌镶(panel的第三人称单数形式)absorbs:v.吸收;吸引的注意(absorb的第三人称单数形式)converts:vt.使转变;转换;使改变信仰/vi.转变,变换;皈依;改变信仰/n.皈依者;改变宗教信仰者But now we need to remember that the data is encoded insubtle changes of the brightness of the LED,so if theincoming light fluctuates,so does the energy harvestedf

10、rom the solar cell.但我们知道 数据是由LED亮度的微妙变化来编码的 所以如果入射的光有波动 那么太阳能电池收集的能量也有波动02:13This means we have a principal mechanism in place to receiveinformation from the light and by the solar cell,because thefluctuations of the energy harvested correspond to the datatransmitted.这就意味着我们具备了一项基本原理:信息通过光的传导,由太阳能电池

11、板接收 因为收集的能量波动与传输的数据相对应02:28Of course the question is:can we receive very fast and subtle当然问题就在 我们是否能够收集到非常迅速和微小的亮度变化 比如通过我们的LED灯传递的那种TED演讲者：Harald Haas|Harald Haas演讲标题：Forget Wi-Fi.Meet the new Li-Fi Internet|“光带”：无线网络的新突破内容概要：What if we could use existing technologies to provide Internet access to

12、the morethan 4 billion people living in places where the infrastructure can.t support it?Using off-the-shelf LEDs and solar cells,Harald Haas and his team have pioneered a new technology thattransmits data using light,and it may just be the key to bridging the digital divide.Take a lookat what the f

13、uture of the Internet could look like.我们能否用已存的技术来给超过40亿人居住的，不具备网络基础设施的地方提供互联网呢？Harald Haas 和他的团队作为技术的先驱者，用现有的 LED 和太阳能电池，实现了通过光传导数据，这很可能是跨越“数字鸿沟”的关键。看一看未来的互联网会是怎么样的吧。Of course the question is:can we receive very fast and subtlechanges of the brightness,such as the ones transmitted byour LED lights?小

14、的亮度变化 比如通过我们的LED灯传递的那种02:43And the answer to that is yes,we can.答案是 是的,我们可以02:54We have shown in the lab that we can receive up to 50megabytes per second from a standard,off-the-shelf solarcell.我们在实验室已经展示 我们能够接收达到每秒50MB的数据 通过一个标准的,现有的太阳能电池02:58And this is faster than most broadband connections these

15、days.这比目前最高速的宽带连接还要快03:06Now let me show you in practice.现在让我来实践展示一下03:11fluctuates:vi.波动;涨落;动摇/vt.使波动;使动摇 harvested:收割/收成 fluctuations:n.物波动(fluctuation的复数);变动;起伏现象 correspond to:相当于,符合于 megabytes:n.百万字节(megabyte的复数)broadband:n.宽频;宽波段/adj.宽频带的;宽波段的;宽频通讯的 in practice:在实践中;实际上,事实上In this box is a sta

16、ndard,off-the-shelf LED lamp.在这个盒子里,是一个现有的标准LED灯03:17This is a standard,off-the-shelf solar cell;it is connected tothe laptop.这是一个现有的标准太阳能电池 它连接到笔记本电脑上03:23And also we have an instrument here to visualize the energywe harvest from the solar cell.这儿我们还有一个测量仪 用来显示我们从太阳能电池收集的能量03:28And this instrument

17、shows something at the moment.现在这个仪表上有读数03:35This is because the solar cell already harvests light from theambient light.这是因为太阳能电池已经开始从周围环境收集光了03:37Now what I would like to do first is switch on the light,andIll simply,only switch on the light,for a moment,and whatyoull notice is that the instrument

18、 jumps to the right.现在,首先我将把灯打开 只是简单的打开灯,等一段时间 你会注意到指针跳到了右边03:43So the solar cell,for a moment,is harvesting energy fromthis artificial light source.所以现在 太阳能电池 正在从这个人工光源接收能量03:54If I turn it off,we see it drops.如果把它关掉,我们看到读数降回去了04:00I turn it on.再打开04:03So we harvest energy with the solar cell.所以我们用

19、太阳能电池收集了能源04:05visualize:vt.形象,形象化;想像,设想/vi.显现 harvests:n.收获;产量;结果/vt.收割;得到/vi.收割庄稼 ambient:adj.周围的;外界的;环绕的/n.周围环境 switch on:接通,开启 harvesting:v.农学收割;收获(harvest的ing形式)/n.农学收割;收获/adj.收获的;收割的But next I would like to activate the streaming of the video.接下来,我将要启动视频传导04:08And Ive done this by pressing thi

20、s button.通过按下这个按钮来实现04:15So now this LED lamp here is streaming a video by changingthe brightness of the LED in a very subtle way,and in a waythat you cant recognize with your eye,because the changesare too fast to recognize.所以现在这个LED灯 正在通过亮度的细微变化传导一个视频 这种亮度变化太快,不能用肉眼识别04:17But in order to prove the

21、 point,I can block the light of thesolar cell.为了证明这一点 我可以阻挡太阳能电池接收的光04:33So first you notice the energy harvesting drops and the videostops as well.首先你会注意到收集的能源下降了 并且视频也停止了04:40If I remove the blockage,the video will restart.如果我移开阻碍物,视频会继续播放04:45(Applause)And I can repeat that.（掌声）这个操作可以重复04:49So we

22、 stop the transmission of the video and energyharvesting stops as well.所以当我们阻止视频的传输能源收集也相应停止04:57So that is to show that the solar cell acts as a receiver.这说明太阳能电池可以作为一个接收器05:03But now imagine that this LED lamp is a street light,andtheres fog.但是现在想像一下这个LED灯是街灯并且周围有雾05:08And so I want to simulate fo

23、g,and thats why I brought ahandkerchief with me.我想模拟有雾的情况 因此我随身带来一个手帕05:14activate:vt.刺激;使活动;使活泼;使产生放射性/vi.激活;有活力 streaming:n.流;(英)按能力分组/v.流动(stream的ing形式)ina way:在某种程度上;有点儿;十分激动 blockage:n.堵塞,堵塞;封锁;妨碍 simulate:vt.模仿;假装;冒充/adj.模仿的;假装的handkerchief:n.手帕;头巾,围巾(Laughter)And let me put the handkerchief o

24、ver the solarcell.（笑声）让我把手帕放到太阳能电池上05:19First you notice the energy harvested drops,as expected,butnow the video still continues.首先你会注意到 能源收集量降低了,和预料的一样但是现在视频仍在继续播放05:25This means,despite the blockage,theres sufficient lightcoming through the handkerchief to the solar cell,so that thesolar cell is a

25、ble to decode and stream that information,inthis case,a high-definition video.这意味着,尽管有阻碍物 还是有足够的光穿过手帕到太阳能电池 因此太阳能电池仍然能够解码、传导数据信息 甚至是我们现在用的高清视频信息05:34Whats really important here is that a solar cell has become a重要的是 太阳能电池在这里成为了一个接收器 接收编码成光的高速无线信号 同时也保持了它作为Whats really important here is that a solar c

26、ell has become areceiver for high-speed wireless signals encoded in light,while it maintains its primary function as an energy-harvesting device.收编码成光的高速无线信号 同时也保持了它作为能源收集设备的基本功能05:51Thats why it is possible to use existing solar cells on the roofof a hut to act as a broadband receiver from a laser

27、stationon a close by hill,or indeed,lamp post.这就是说,屋顶上那些现有的太阳能电池 可以用来作为宽带网络的接收器 信号可以来自靠近山坡的激光站,或者街边的路灯06:05And It really doesnt matter where the beam hits the solarcell.哪里的光束到达太阳能电池并不要紧06:19www.XiYuS锡育软件And the same is true for translucent solar cells integratedinto windows,solar cells integrated in

28、to street furniture,orindeed,solar cells integrated into these billions of devicesthat will form the Internet of Things.并且实际上 窗户上安装的半透明太阳能电池 安装在街道设施上的太阳能电池 甚至安装在成千上万其他设备上的太阳能电池 它们将会形成物联网06:23decode:vt.计通信译码,解码/vi.从事破译工作 high-definition:adj.非常鲜明的 wireless:adj.无线的;无线电的/n.无线电/vt.用无线电报与联系;用无线电报发送/vi.打无线

29、电报;打无线电话 maintains:vt.维持;继续;维修;主张;供养 translucent:adj.透明的;半透明的 integrated:adj.综合的;完整的;互相协调的/v.整合;使成整体(integrate的过去分词)Because simply,we dont want to charge these devicesregularly,or worse,replace the batteries every few months.这是因为 我们不想经常给这些设备充电 更不想每几个月就要更换电池06:38As I said to you,this is the first tim

30、e Ive shown this in public.我之前说 这是我第一次向公众展示这些06:46Its very much a lab demonstration,a prototype.这次展示可以说是一个实验证明 一个原型06:50But my team and I are confident that we can take this tomarket within the next two to three years.但是我和我的团队有信心接下来两到三年,这项产品会进入市场06:54And we hope we will be able to contribute to clos

31、ing thedigital divide,and also contribute to connecting all thesebillions of devices to the Internet.希望我们能够对终结“数字鸿沟”做出贡献 并且帮助成千上万的设备连接到互联网07:00And all of this without causing a massive explosion of energyconsumption-because of the solar cells,quite the opposite.而且所有设备不会造成 巨大的能源消耗 因为我们将利用现有的太阳能电池07:10Thank you.谢谢07:16(Applause)（掌声）07:17contribute to:有助于;捐献*Warning:本文是由生成导出，请用于个人学习，不要用于商业用途。否则，导致的一切法律后果，均由您个人承担，锡育软件概不负责。*