视听说,wireless, communication幻灯片.ppt

1、Wireless Communication,Science and Technology,Unit 1,无线通信,Part 1 Lead-in,Part 2 Communication Skills,Part 3 In-putting 手机 ; 蜂窝电话 ; 行动电话 cellular seljl adj. 细胞的；多孔的；由细胞组成的 n. 移动电话；单元 cellular network 蜂窝网络 ; 细胞网络 household hashld n. 家庭；一家人 gadget gdt n. 小玩意；小器具；小配件；诡计 wireless gadgets 无线设备 apart from

2、除了 condemn kndem vt. 谴责；判刑，定罪；声讨,What is wireless communication?,Wireless communication is the transfer of information between two or more points that are not connected by an electrical conductor. Wireless operations permit services, such as long-range communications, that are impossible or impracti

3、cal to implement with the use of wires.,What is wireless communication?,转移；传递,电导体,不切实际的，不现实的,执行；实现,What is wireless communication?,satellite television,deep-space radio communications,cellular telephones,卫星电视,外太空无线电通信,移动电话,What is wireless communication?,GPS units,Wireless mice and keyboard,Garage d

4、oor opener,全球定位系统装置,无线鼠标和键盘,车库门摇控开关,The history of wireless communication.,The first wireless networks were developed in the Pre-industrial age. These systems transmitted information over line-of-sight distances (later extended by telescopes) using smoke signals, torch signals, flashing mirrors, sig

5、nal flares, or semaphore flags. Observation stations were built on hilltops and along roads to relay these messages over large distances.,The history of wireless communication.,Smoke signals on the Great Wall,视线距离,旗语,信号弹,工业化时代,The worlds first wireless telephone conversation occurred in 1880, when A

6、lexander Graham Bell and Charles Sumner Tainter invented and patented the photophone, a telephone that conducted audio conversations wirelessly over modulated light beams (which are narrow projections of electromagnetic waves).,The history of wireless communication.,Photophone,v. 取得的专利权,光音机；光线电话机,声音

7、的,调制光束,投射,电磁波,In 1895, a few decades after the telephone was invented, Marconi demonstrated the first radio transmission from the Isle of Wight to a tugboat 18 miles away, and radio communications was born. Then he was awarded the 1909 Nobel Prize for Physics for his contribution to wireless telegra

8、phy.,The history of wireless communication.,Guglielmo Marconi,拖船,怀特岛（英国）,诺贝尔物理学奖,无线电报,1910,1950s,1963,1948,1960s,Vacuum tube,Semiconductor,GEO satellite,Shannons theory,Integrated circuit,The history of wireless communication.,真空管；电子管,信息论,半导体,集成电路,同步轨道卫星,The history of wireless communication.,Nearly

9、 ten years one generation,Nowadays, the fourth generation cellular system can be reached in many cities with higher data rates comparing to previous generations. And the fifth generation is in approach.,数据传输速率,蜂窝系统,How does wireless communication influence our life?,How does wireless communication i

10、nfluence our life?,One of the best-known examples of wireless technology is the mobile phone, also known as a cellular phone, with more than 4.6 billion mobile cellular subscriptions worldwide as of the end of 2010. These wireless phones use radio waves to enable their users to make phone calls from

11、 many locations worldwide. They can be used within range of the mobile telephone site to transmit and receive the radio signals from these instruments.,Mobile phone,订阅,How does wireless communication influence our life?,Wi-Fi is a wireless local area network that enables portable computing devices t

12、o connect easily to the Internet. Wi-Fi has become the de facto standard for access in private homes, within offices, and at public hotspots. Some businesses have begun offering it for free in an effort to increase the sales of their goods.,Wi-Fi,无线局域网,事实标准；约定俗成的标准,How does wireless communication in

13、fluence our life?,Wireless energy transfer is a process whereby electrical energy is transmitted from a power source to an electrical load that does not have a built-in power source, without the use of interconnecting wires. There are two different fundamental methods for wireless energy transfer. I

14、t can help us charge our digital products without wire which used to bother us a lot.,Wireless charge,电力负荷,内置电源,连接电线,无线能量传输,How does wireless communication influence our life?,mobile body area networks (MBAN),New technologies such as mobile body area networks (MBAN) can monitor blood pressure, heart

15、 rate, oxygen level and body temperature, all with wireless technologies. This technology helps with the intentional and unintentional risk of infection or disconnection that arise from wired connections.,医疗体域网,The preview of the wireless communication future.,The preview of the wireless communicati

16、on future.,Hardware Design Small, lightweight, low power, cheap, high frequency operations, large coverage. Network Design High data rates, robust to noise and interference, large user capability. In the future, you can get any information anytime anywhere.,抗噪声干扰,庞大的用户能力,高数据速率,Questions:,1. How much

17、 time do you spend on your cell phone? 2. What do you usually do with a cell phone? What are cell phones used for in your daily life? 3. Do you think children and teens should have their own cell phones? Why or why not? 4. Which one of the functions do you use most? Why? 5. What do you think of usin

18、g cell phones in public places? 6. How do you feel if you leave the house without your cell phone?,Activity 1 Listening,Are Cell Phones Dangerous?,Word Tips,hazardous hzds adj. 冒险的，有危险的 tumour tumr n. 肿瘤 exposure ksp; ek- n. 暴露，揭露 professional adj. 职业的，专业的,= risky,Is talking on a cell phone to your

19、health? It is difficult to know for sure. Some research suggests that users of mobile phones are at a greater risk of developing brain tumours. However, many other studies suggest there are no links between and cell phone use. The main problem with the current research is that mobile phones have onl

20、y been popular since the 1990s. As a result, it is impossible to study the long term of cell phone use. This concerns many professionals who point out that many cancers take at least 10 years to develop. Another concern about these studies is that many have been funded by those who benefit from the

21、cell phone industry.,Activity 1 Listening,Are Cell Phones Dangerous?,hazardous,heavy,cancer,exposure,health,financially,重度使用者,Activity 2 Viewing,Cell Phones,1. A cellular phone connects to the network . A. by wire B. by radio waves C. by transmitter D. by micro waves 2. When you make a cellular tele

22、phone call, is necessary. A. a receiver B. a transmitter C. an antenna D. a cable 3. When a person in a moving car uses a cellular telephone, . A. his call is often interrupted. B. he cannot put through his call. C. his call isnt disturbed. D. the signal of his call cant be passed.,Directions: Watch

23、 the video clip with the topic of Cell Phones twice, and then choose the best answer to each question.,B,C,C,无线电波,电讯 发射机,接收器,天线,电缆；网线,Activity 2 Viewing,Cell Phones,Video Transcript： One-line ordinary phones connect to the network by wire: a cellular telephone connects with the network by radio wave

24、s. A cellular telephone is actually a radio transmitter and receiver. This founds work with network of low-power radio antennas and transmitters. Each station serves a geographical area called a cell. When an antenna receives radio signals from a cellular telephone, it sends them to a switching offi

25、ce, which in turn sends them by cable into the ordinary telephone network. The call is then routed to destination. When a person in a moving car uses a cellular telephone, the antenna in the near cell handles the radio signals. As the car moves, the signals pass the next cell without interrupting th

26、e call.,单元,交换局,按规定路线发送到目的地,Part 2 Communication Skills,Activity 1 Oral Functions,Do you know the ways of showing agreement and disagreement?,Activity 1 Oral Functions,我同意部分,倾向于,Activity 2 Oral Practice,Task 1 Listening,Directions: Listen to the conversation and fill in the blanks.,Tips psychedelic ,

27、sakdelk; -dilk adj. 使人产生幻觉的，迷幻的，迷魂的 stereo ster; str adj. 立体声的 n. 立体声 crank up 转动曲柄以发动（引擎）,Activity 2 Oral Practice,Task 1 Listening,A: You know, Richard, I really think we ought to fix up our apartment a little. B: What for? Whats wrong with it the way it is? A: Are you kidding? It is so empty. B:

28、You cant be about that. A room is just a room. Why do we have to fill it up with a bunch of junk? Besides, it costs money. A: Well, you there, but it doesnt have to be that expensive. I know there is a little thrift store around the corner. We can go there and get a few simple things, just make it f

29、eel like a home. B: A few things? Oh, man, this is going to cost money. You must . A: , but it doesnt have to cost a lot. B: Why cant we just leave it the way it is? I like it. I feel comfortable here. You start putting a lot of nice things around and its going to be a museum.,改进；修理,二手店，旧货店,Activity

30、 2 Oral Practice,Task 1 Listening,A: Hmm, Im not sure . We are not the only ones that are going to be here. We want to have friends over, you know, have people over to study. Theyve got to have places to stay. B: That is . We could get a couple of psychedelic posters and a lava lamp. Get a black lig

31、ht. Crank up the stereo. We could have cool parties here. A: Parties, Richard? I for a minute. Richard, we are not going to have any time to party. We are going to be too busy studying. That is what were in college for! B: College is about having parties, about having friends over. I dont want somet

32、hing that looks like my parents house. A: Look. It doesnt have to look like your parents house. We just need a few simple things like chairs. Maybe some plants. You know, itll just make it nice and homey. B: Homey? I . I am not here looking for homey. I am a college student. A: At this rate, were ne

33、ver going to find anything that we both like. B: Yeah, well, at least I am you on that.,迷幻的海报和熔岩灯,打开音响,舒适的；家庭似的,这样的话，照这样下去,Activity 2 Oral Practice,Task 1 Listening,A: You know, Richard, I really think we ought to fix up our apartment a little. B: What for? Whats wrong with it the way it is? A: Are

34、you kidding? It is so empty. B: You cant be about that. A room is just a room. Why do we have to fill it up with a bunch of junk? Besides, it costs money. A: Well, you there, but it doesnt have to be that expensive. I know there is a little thrift store around the corner. We can go there and get a f

35、ew simple things, just make it feel like a home. B: A few things? Oh, man, this is going to cost money. You must . A: , but it doesnt have to cost a lot. B: Why cant we just leave it the way it is? I like it. I feel comfortable here. You start putting a lot of nice things around and its going to be

36、a museum.,serious,have a point,be joking,Well, yes,Check the answers,Activity 2 Oral Practice,Task 1 Listening,A: Hmm, Im not sure . We are not the only ones that are going to be here. We want to have friends over, you know, have people over to study. Theyve got to have places to stay. B: That is .

37、We could get a couple of psychedelic posters and a lava lamp. Get a black light. Crank up the stereo. We could have cool parties here. A: Parties, Richard? I for a minute. Richard, we are not going to have any time to party. We are going to be too busy studying. That is what were in college for! B:

38、College is about having parties, about having friends over. I dont want something that looks like my parents house. A: Look. It doesnt have to look like your parents house. We just need a few simple things like chairs. Maybe some plants. You know, itll just make it nice and homey. B: Homey? I . I am

39、 not here looking for homey. I am a college student. A: At this rate, were never going to find anything that we both like. B: Yeah, well, at least I am you on that.,youre right,a good point,couldnt accept that,disagree,with,Activity 2 Oral Practice,Task 2 Viewing,Directions: Watch the video twice, a

40、nd then fill in the blanks.,1.Home-schooling may and their peers. 2.Home-schooling may produce in children colored strongly by that of parents. 3.Home-schooling is a decision , , who are too young to judge them.,isolate children from society,a view of life,made by parents,not the children,what is go

41、od for,家庭学校教育,平辈,Activity 2 Oral Practice,Task 2 Viewing,Video Transcript： Home-schooling In my opinion, home-schooling may be suitable for some special families and their children, but is not worth popularizing. My first concern is that home schooling may isolate children from society and their pee

42、rs. These children will very likely lack social skills, which may put them at a disadvantage when they eventually leave their homes to work in our competitive society. Secondly, home-schooling may produce in children a view of life colored strongly by that of parents. They may look at things from th

43、e point of view of their parents and fail to develop their own independent ideas about the world. Thirdly, home-schooling is a decision made by parents, not the children, who are too young to judge what is good for them. What if the children later want to go to school? They may envy those who can st

44、udy, play and go to school together. It is human nature to long for whatever is denied you. It is the same with children. In short, I dont think home-schooling is worth popularizing at present.,Part 3 In-putting we could update each other more often. But one time it broke down. And it reminded me of

45、 a day in 1971. There was a war going on in my country. And my family moved out of urban place, where we used to live, to a remote rural area where it was safer. And one time my mother asked me to get some medicine for a younger sibling. And I walked 10 miles or so, all morning, to get there, to the

46、 medicine man. And he wasnt there, so I walked all afternoon back. So I had another unproductive day. So while I was sitting in a tall building in New York, I put these two experiences together side by side, and basically concluded that connectivity is productivitywhether its in a modern office or a

47、n undeveloped village. So naturally, Ithe implication of that is that telephone is a weapon against poverty.,Activity 1 Listening to Learn,Task 2 Oral Practice,1. Directions: Read the following dialogues and then have a discussion with your partners, using the key points in discussions in the box an

48、d the topic The Pros and Cons of Cell Phone Use.,Key Points in Discussion the pros and cons (advantages and disadvantages); a valuable part of peoples life; convenient; helpful; a good form of entertainment; instant communication, Internet access, text messaging, and camera and video capabilities;,a

49、nnoying; noisy; health risks; harm peoples brains; too expensive; a distraction to students,Activity 1 Listening to Learn,1. The Pros and Cons of Cell Phone Use,A: I just love my tiny little gadgetmy cell phone! It can tell me what time it is, let me check the Internet, keep me in touch with everyon

50、e, and go wherever I go. B: Well, I agree that those are the very benefits of cell phonesI mean like instant communication, Internet access, text messaging, and camera and video capabilities, etc. But have you ever thought about the dark side of cell phone use? A: Dark side? You mean disadvantages?

51、I have never given that a thought. B: Well, despite its various advantages, a cell phone can sometimes be a hindrance too. See, have you ever been in the car on the way to work and received a call, asking you to hurry up? Has your boss ever called you while you were in a shower, or worse, on a date?

52、 A: Oh, those sorts of things have never happened to me, but still they sound annoying! It seems like you think you are free from your job, but with a cell phone, your job can now follow you home. B: Exactly! And thats just one of the big problems with cell phone use. Hey, Ive got an idea. What abou

53、t making a list of pros and cons of cell phone use so that we can have a clear picture of this issue, what do you say? A: Great idea. Lets do it.,Activity 1 Listening to Learn,1. The Pros and Cons of Cell Phone Use,A: It is hard to even imagine life without cell phones. They have become such a vital

54、 part of our lives that being separated from them would probably leave us in a state of suspended action. B: I couldnt agree more! A: But like any other things, cell phones too have their pros and cons. B: Yeah, a cell phone is a very handy device to have at all times. You forgot to put on your watc

55、h after your shower this morning? Dont worry, your cell phone will suffice. Theres always the time where you stop and say I wish I had my camera with me or My memory cards all full. No worries, cell phones are always around for backup. A: The disadvantages of cell phones are obvious, though. For exa

56、mple, there is an increased likelihood of accident when people drive while talking on a cell phone, the radiations emitted by some of cell phones are likely to cause brain tumors, and constant use of a cell phone can be harmful. B: Thats true. Some doctors say, the longer you speak on the phone, the

57、 more risk you may have of getting tumors. A: Are there any good ways for us to avoid harmful electromagnetic radiation from cell phones? B. I think what we can do is keep the phone away from our body as much as possible, or get a corded headset or Bluetooth devices to keep the phone away from our h

58、ead. A. Good idea. Im definitely going to get myself a headset.,Activity 1 Listening to Learn,2. Directions: Form groups of four or five. Discuss with your group members and make a list of arguments for or against Cell Phone Use in School, practicing the expressions that you have learned in this uni

59、t about agreeing and disagreeing.,Task 2 Oral Practice,Activity 1 Listening to Learn,2. Cell Phone Use in School,Arguments for cell phone use in school Mobile phones are safe for children to use we should ignore scare stories in the media. The latest research says that mobile phones do not damage brain cells. Even those earlier studies that suggeste