紅外通信的基礎知識-外文翻譯已處理

1、Infrared Remote Control SystemAbstractRedoutside data correspondence the technique be currently within the scope ofworld drive extensive usage of a kind of wireless conjunction technique,drivenumerous hardware and software platform support. Red outside the transceiverproduct have cost low, small sca

2、led turn, the baud rate be quick, point to point SSL, notby the electromagnetic interference etc.characteristics, can realization information atdissimilarity of the product fast, convenience, safely exchange and transmission, atshort distance wireless deliver aspect to own very obvious of advantage.

3、Along with redoutside the data deliver a technique more and more mature, the cost descend, redoutside the transceiver necessarily will get at the short distance communication realmmore extensive of application.The purpose that design this system is transmit customers operation informationwith infrar

4、ed rays for transmit media, then demodulate original signal with receivecircuit. It use coding chip to modulate signal and use decoding chip to demodulatesignal. The coding chip is PT2262 and decoding chip is PT2272. Both chips are madein Taiwan. Main work principle is that we provide to input the i

5、nformation for thePT2262 with coding keyboard. The input information was coded by PT2262 andloading to high frequent load wave whosefrequent is 38 kHz, then modulateinfrared transmit dioxide and radiate space outside whenit attain enough power. Thereceive circuit receive the signal and demodulate or

6、iginal information. The originalsignal was decoded by PT2272, so as to drive some circuit to accomplish customers operation demand.Keywords:Infrared；Code；Decoding；LM386；Redout-side transceiver1 Introduction1.1 research the background and significanceInfrared Data Communication Technology is the worl

7、d wide use of a wirelessconnection technology, by the many hardware and software platforms supported. Is adata through electrical pulses and infrared optical pulse switch between the wirelessdata transceiver technology.Infrared transceiver products with low cost, small, fast transmission rate, thepo

8、int-to-point transmission security, not subject to electromagnetic interference andother characteristics that can be achieved between the different products, rapid,convenient and safe exchange and transmission, In short distance wirelesstransmission have a very distinct advantage.Infrared transceive

9、r products in the portable product of a great role. At present,the worlds 150 million piece of equipment used infrared technology in electronicproducts and industrial equipment. medical equipment and other fields widely used.For example, 95%of the notebook computers on the installation of infrared t

10、ransceiverinterface the majority of the cell phone is also the allocation of infrared transceiverinterface. With the exchange of quantitative data, infrared data communications willenable cell phone data transmission more convenient. With infrared data transmissiontechnology matures, perfect, low co

11、sts, Infrared Transceiver in short distancecommunications will be more widely applied.This chapter first describes the infrared transceiver IC design issues to thebackground and significance. then briefed the infrared data communicationstechnology features and applications, and infrared transceiver

12、product characteristics,domestic and international situation and development trend of the last under infraredremote transceiver system in practical application to establish a task of designorientation.1.2 Infrared Remote Control Transceiver SystemInfrared remote control system is divided into single

13、-channel and multi-channelremote control. Only a commandsignal transmission channel, called single-channelremote control system; with more than two instructions signal transmission channelknown as a multi-channel remote control system. Relatively simple single-channelremote control, in general, only

14、 a launcher directive Key receivers and only one circuitimplementation. While in the receiving circuit to add more stable memory circuits thatcan be activated commandsto launch a number of key, so thatthe receiver circuit multistate memory circuit repeatedly to change the state, to realizemany of th

15、e functional control, But such a state of change is the order. If we are toachieve an arbitrary control, resort to the use of multi-channel remote control system.Multi-channel remote control can be realized by the object of arbitrary multi-functionremote control. As for the choice of several routes

16、and what control methods,according to the actual situation such as object, operational requirements and costaccounting, etc. to decide. General infrared remote transceiver system by infraredremote control transmitter signal coding, infrared remote control signal receivers anddecoders or decoder chip

17、 MCU and the external circuit consisting of three parts. Signaltransmitter remotecontrol code used to generate pulses of infraredemission-driven output infrared remote control signal, receiver completion of theremote control signal amplification and detection, plastic and demodulation encodingpulse.

18、 Infrared remote control coded pulse is going to obtain a continuous serial binarycode, and for most of the infrared transceiver system, This serial code asmicro-controller of the remote control input signals from the internal CPU completion ofthe remote control instruction decoder, on the other inf

19、rared remote controltransceivers, the designers of electronic products, The internal micro-controller of theremote control decoder directive is not accessible. Therefore, people are using infraredencoder / decoder chip and micro-controller developed various generic infrared remotetransceiver system,

20、 In various equipment infrared signals between the transceiver.Remote transceiver system generally transmitters and receivers is composed oftwo parts. Launchers from the general direction keys, coded instructions circuitmodulation circuit, driving circuit, firing circuit of several parts. When press

21、ed a key, thedirective coding circuit, in the corresponding instructions encoded signal, the encodersignal to the carrier modulation, Driven by the power amplifier circuit after circuit firedfrom the field after firing instructions coded modulation signals. General receiver by thereceiving circuit,

22、the amplifier circuit, demodulation circuits, instruction decoder circuit,driving circuit, circuit implementation of several parts. Receiving Circuit will launchvehicles have been coded modulation signal receiving instructions from, and to enlargeevacuation demodulation circuit. Demodulation circuit

23、 will have the coding modulationsignal demodulation, namely, reduction of signal coding. The instruction decoder to theencoder signal decoding, Driven by the final circuit to drive the implementation ofvarious instructions circuit to control the operation.2 Infrared communication of knowledge2.1 inf

24、rared ray foundation knowledgeinfrared outlinedInfrared is actually a kind of electromagnetic wave. From the analysis of variousnatural component of the electromagnetic wave reflected spectrum is :-ray, x-ray,ultraviolet, visible, infrared, microwave and radio wave. From the viewpoint of form,and th

25、ey did not seem to, but if the wavelength in descending order, and we will findhim all the onlyvisible light spectrum of the entire 0.38卩m- 0.76卩m so long littlearea, and adjacent to the visible light and infrared including the far infrared,mid-infrared and near infrared foreign accounts for the spe

26、ctrum of 0.76卩m 1000卩m of a major. Which micron wavelength range also includes UV, visible, near infrared,mid-infrared and far-infrared, microwave.From the above analysis shows that infrared is a very rich spectrum resources, itcurrently has in production, life, military, medical, and other aspects

27、have been widelyused, such as infrared heating, medical infrared, infrared communication, infraredcamera, infrared remote control, and so on. Infrared remote control is the manyapplications of infrared part of the current household appliances widely used in TVremote control, VCR remote control, VCD

28、remote control, high-fidelity audio remotecontrol, are used infra-red remote control, It allows the control of these appliances havebecome very easy.infrared propertiesInfrared lies between visible light and microwave a wave, it is withvisible light and its adjacent, it is visible in certain charact

29、eristics,such as straight-linetransmission, reflection, refraction, scattering,diffraction, can be certain objects and can be absorbed through the lens of theirfocusing. In the far-infrared region, owing to its neighboring microwave, it has somecharacteristics of microwave, If a strong penetrating p

30、ower and can run through someopaque substances. Since inany object, naturalprofession, regardless of whether its ownluminescence referringto visible light , as long as the temperature isabove absolute zero -273C , moment will be kept around to infraredradiation. Only higher temperature of objects st

31、rong infrared radiation, low-temperatureobjects infrared radiation weaker. Therefore infrared feature is the greatest commoninnature, it is called thermal radiation called thermal radiation. Infrared cameras, infrarednight marketpyroelectric infrareddetectors and some other missiles aiming at is the

32、use of this characteristic of infrared work.2.2 infrared communication basic tenetsinfrared communication PrincipleCommunication is the use of infrared wavelength of 900 nm-infrared waves from1000 to serve as an information carrier, through infrared technology between the twoclose communication and

33、confidentiality of information transmitted. Infraredcommunication system structure include : part launcher, channel, the receiver part.certain clinical characteristicsof the wave. In the near-infrared,Launcher source letter issued after the binary signal from the high-frequencymodulated infrared LED

34、 sent, receiving device regard the reception of high-frequencysignals from the infrared receiver tube after receiving further demodulationphotoelectric conversion of the original information of a mass communication lose way.Afterwardsthe formerInformation received after receiving part of the drive c

35、ircuit connected to the expectedcompletion of the various functions. To which the modulation coding style pulse widthmodulation by changing the pulse width modulated signal PWM andpulse modulationtime through change the pulse train interval time between the modulation signal PPMtwo.紅外遙控系統(tǒng)摘要 紅外數(shù)據(jù)通信技術

36、是目前在世界范圍內被廣泛使用的一種無線連接技術， 被 眾多的硬件和軟件平臺所支持。 紅外收發(fā)器產品具有成本低， 小型化， 傳輸速率 快，點對點安全傳輸，不受電磁干擾等特點， 可以實現(xiàn)信息在不同產品之間快速、 方便、安全地交換與傳送，在短距離無線傳輸方面擁有十分明顯的優(yōu)勢。隨著紅 外數(shù)據(jù)傳輸技術更加成熟、成本下降，紅外收發(fā)器在短距離通訊領域必將得到更 廣泛的應用。本系統(tǒng)的設計目的是用紅外線作為傳輸媒質來傳輸用戶的操作信息并由接 收電路解調出原始信號，主要用到編碼芯片和解碼芯片對信號進行調制與解調，其中編碼芯片用的是臺灣生產的PT2262解碼芯片是PT2272主要工作原理是: 利用編碼鍵盤可以為P

37、T2262提供的輸入信息，PT2262對輸入的信息進行編碼并 加載到38KHZ勺載波上并調制紅外發(fā)射二極管并輻射到空間，然后再由接收系統(tǒng) 接收到發(fā)射的信號并解調出原始信息，由PT2272對原信號進行解碼以驅動相應 的電路完成用戶的操作要求。關鍵字：紅外線；編碼；解碼；LM386紅外收發(fā)器。1緒論11課題研究的背景及意義紅外數(shù)據(jù)通信技術是目前在世界范圍內被廣泛使用的一種無線連接技術， 被 眾多的硬件和軟件平臺所支持。 是一種通過數(shù)據(jù)電脈沖和紅外光脈沖之間的相互 轉換實現(xiàn)無線的數(shù)據(jù)收發(fā)的技術。紅外收發(fā)器產品具有成本低，小型化，傳輸速率快，點對點安全傳輸，不受 電磁干擾等特點， 可以實現(xiàn)信息在不同產

38、品之間快速、 方便、安全地交換與傳送， 在短距離無線傳輸方面擁有十分明顯的優(yōu)勢。紅外收發(fā)器產品在可攜式產品中的應用作用很大。目前，全世界有1億5千萬臺設備采用紅外技術，在電子產品和工業(yè)設備、醫(yī)療設備等領域廣泛使用。 比如有95的筆記本電腦就安裝了紅外收發(fā)器接口,現(xiàn)在絕大多數(shù)手機上也配 置紅外收發(fā)器接口。 而且隨著交換的數(shù)據(jù)量變大， 紅外數(shù)據(jù)通訊將使手機的數(shù)據(jù) 傳輸越來越方便。隨著紅外數(shù)據(jù)傳輸技術越來越成熟、完善、成本更低廉，紅外 收發(fā)器在短距離通訊領域必將得到更廣泛的應用。本章首先闡述了紅外收發(fā)集成電路設計課題的背景和意義， 然后簡要介紹了 紅外數(shù)據(jù)通訊技術的特點和應用領域， 以及紅外收發(fā)器產

39、品的特點、 國內外現(xiàn)狀 和發(fā)展趨勢，最后根據(jù)紅外遙控收發(fā)系統(tǒng)的實際應用性確立了課題的設計定位。12紅外遙控收發(fā)系統(tǒng)簡介紅外遙控系統(tǒng)分為單通道遙控和多通道遙控。 只有一個指令信號傳送通道的 稱為單通道遙控系統(tǒng);具有兩個以上指令信號傳送通道的稱為多通道遙控系統(tǒng)。 單通道遙控比較簡單,一般來說,發(fā)射器僅有一個指令鍵,接收器也只有一個 執(zhí)行電路。雖然在接收電路中加入多穩(wěn)態(tài)記憶電路,可以根據(jù)按動發(fā)射器指令鍵 的次數(shù),使接收電路中的多穩(wěn)態(tài)記憶電路的狀態(tài)多次改變,實現(xiàn)多項功能控制,但是這種狀態(tài)的改變是順序進行的。 如果要實現(xiàn)一項任意控制,就要采用多通道 遙控系統(tǒng)。 多通道遙控可以實現(xiàn)對被控對象的任意多功能遙

40、控。 至于選用幾個通 道及何種控制方式,要根據(jù)實際情況 如被控對象、操作要求及成本核算等 來決 定。一般的紅外遙控收發(fā)系統(tǒng)是由紅外遙控信號編碼發(fā)送器、 紅外遙控信號接收 器和解碼器 （解碼芯片或單片機） 及其外圍電路等三部分構成的。 信號發(fā)送器用 來產生遙控編碼脈沖， 驅動紅外發(fā)射管輸出紅外遙控信號， 接收器完成對遙控信 號的放大、 檢波、整形并解調出編碼脈沖。 紅外遙控編碼脈沖是一組組連續(xù)的串 行二進制碼，對于一般的紅外收發(fā)系統(tǒng)， 此串行碼作為微控制器的遙控輸入信號， 由其內部CPU完成對遙控指令的解碼，對其他各種紅外遙控收發(fā)電子產品的設計 者來說，上述的微控制器內部解碼出的遙控指令是不便于

41、利用的。 因此，人們利 用紅外編/解碼芯片及單片機研制出多種通用紅外遙控收發(fā)系統(tǒng)，在各種設備之 間進行紅外信號的收發(fā)。遙控收發(fā)系統(tǒng)一般由發(fā)射器和接收器兩部分組成。 發(fā)射器一般由指令鍵、 指 令編碼電路、調制電路、驅動電路、發(fā)射電路等幾部分組成。當按下某鍵時,指令編碼電路,產生相應的指令編碼信號,編碼指令信號對載波進行調制,再由 驅動電路進行功率放大之后由發(fā)射電路向外發(fā)射經過調制的指令編碼信號。 接收器一般由接收電路、放大電路、解調電路、指令譯碼電路、驅動電路、執(zhí)行電路 等幾部分組成。接收電路將發(fā)射器發(fā)射的已調制的編碼指令信號接收下來,并進 行放大后送解調電路。解調電路將已調制的編碼信號解調下來

42、,即還原為編碼信 號。指令譯碼器將編碼指令信號進行譯碼,最后由驅動電路來驅動執(zhí)行電路實現(xiàn) 各種指令的操作控制。13紅外遙控收發(fā)器產品概況控收發(fā)器產品的結構和類型 目前紅外收發(fā)器按照工作模式和傳輸速率可分為四類： 串行模式，最高速率為115.2Kbps;中速模式：最高bps;高速模式：最高速率為16Mbps另外按芯片功耗大小又可以分為低功耗型和標準型兩類， 低功耗型通常使用3V電源，傳輸距離較近，約0-30cm,標準型通常使用5V電源，傳輸距離較遠最 少1m以上。控收發(fā)器的國內外現(xiàn)狀在紅外通信技術發(fā)展的早期， 存在好幾個紅外通信標準， 不同標準之間紅外 設備不能進行紅外通信。為了使各種紅外設備能

43、夠互聯(lián)互通，1993年由20多個 大廠商發(fā)起成立了紅外數(shù)據(jù)協(xié)會（IRDA統(tǒng)一了紅外通信的標準，這就是目前被 廣泛使用的紅外數(shù)據(jù)通信協(xié)議及規(guī)范，也稱為IRDA標準。自1993年IRDA成立至今，紅外數(shù)據(jù)協(xié)會的會員已經發(fā)展到150多個，IRDA標準已經獲得了業(yè)界廣泛認同和支持。 已經開發(fā)出來的具備紅外通訊能力的設備 已經有一百多種之多， 紅外模塊的年裝機量已經達到一億五千萬套。 盡管現(xiàn)在有 了同樣是近距離無線通訊的藍牙技術， 但以紅外通訊技術低廉的成本和廣泛的兼 容性的優(yōu)勢，紅外數(shù)據(jù)通訊仍舊會在將來很長一段時間內在短距離的無線數(shù)據(jù)通 訊領域扮演重要角色。由IRDA協(xié)會的資料表明，國外公司的紅外收發(fā)器產品起步較早，已經形成 了紅外收發(fā)器的配套生產產業(yè)鏈。由以下部分組成：Sharp等公司主要提供紅外 發(fā)光二極管和光敏二極管；Agilent等公司主要設計制作紅外收發(fā)芯片；Infineon等公司主要從事紅外收發(fā)器封裝；IBM、Micro