红外通信的基础知识毕业论文外文翻译.doc

1、Infrared Remote Control SystemAbstractRed outside data correspondence the technique be currently within the scope of world drive extensive usage of a kind of wireless conjunction technique,drive numerous hardware and software platform support. Red outside the transceiver product have cost low, small

2、 scaled turn, the baud rate be quick, point to point SSL, not by the electromagnetic interference etc.characteristics, can realization information at dissimilarity of the product fast, convenience, safely exchange and transmission, at short distance wireless deliver aspect to own very obvious of adv

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

4、with infrared rays for transmit media, then demodulate original signal with receive circuit. It use coding chip to modulate signal and use decoding chip to demodulate signal. The coding chip is PT2262 and decoding chip is PT2272. Both chips are made in Taiwan. Main work principle is that we provide

5、to input the information for the PT2262 with coding keyboard. The input information was coded by PT2262 and loading to high frequent load wave whose frequent is 38 kHz, then modulate infrared transmit dioxide and radiate space outside when it attain enough power. The receive circuit receive the sign

6、al and demodulate original information. The original signal 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 significance Infrared Data Communication

7、Technology is the world wide use of a wireless connection technology, by the many hardware and software platforms supported. Is a data through electrical pulses and infrared optical pulse switch between the wireless data transceiver technology.Infrared transceiver products with low cost, small, fast

8、 transmission rate, the point-to-point transmission security, not subject to electromagnetic interference and other characteristics that can be achieved between the different products, rapid, convenient and safe exchange and transmission, In short distance wireless transmission have a very distinct

9、advantage.Infrared transceiver products in the portable product of a great role. At present, the worlds 150 million piece of equipment used infrared technology in electronic products and industrial equipment. medical equipment and other fields widely used. For example, 95% of the notebook computers

10、on the installation of infrared transceiver interface the majority of the cell phone is also the allocation of infrared transceiver interface. With the exchange of quantitative data, infrared data communications will enable cell phone data transmission more convenient. With infrared data transmissio

11、n technology matures, perfect, low costs, Infrared Transceiver in short distance communications will be more widely applied. This chapter first describes the infrared transceiver IC design issues to the background and significance. then briefed the infrared data communications technology features an

12、d applications, and infrared transceiver product characteristics, domestic and international situation and development trend of the last under infrared remote transceiver system in practical application to establish a task of design orientation.1.2 Infrared Remote Control Transceiver SystemInfrared

13、remote control system is divided into single-channel and multi-channel remote control. Only a command signal transmission channel, called single-channel remote control system; with more than two instructions signal transmission channel known as a multi-channel remote control system. Relatively simpl

14、e single-channel remote control, in general, only a launcher directive Key receivers and only one circuit implementation. While in the receiving circuit to add more stable memory circuits that can be activated commands to launch a number of key, so that the receiver circuit multistate memory circuit

15、 repeatedly to change the state, to realize many of the functional control, But such a state of change is the order. If we are to achieve 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-func

16、tion remote control. As for the choice of several routes and what control methods, according to the actual situation (such as object, operational requirements and cost accounting, etc.) to decide. General infrared remote transceiver system by infrared remote control transmitter signal coding, infrar

17、ed remote control signal receivers and decoders (or decoder chip MCU) and the external circuit consisting of three parts. Signal transmitter remote control code used to generate pulses of infrared emission-driven output infrared remote control signal, receiver completion of the remote control signal

18、 amplification and detection, plastic and demodulation encoding pulse. Infrared remote control coded pulse is going to obtain a continuous serial binary code, and for most of the infrared transceiver system, This serial code as micro-controller of the remote control input signals from the internal C

19、PU completion of the remote control instruction decoder, on the other infrared remote control transceivers, the designers of electronic products, The internal micro-controller of the remote control decoder directive is not accessible. Therefore, people are using infrared encoder / decoder chip and m

20、icro-controller developed various generic infrared remote transceiver system, In various equipment infrared signals between the transceiver.Remote transceiver system generally transmitters and receivers is composed of two parts. Launchers from the general direction keys, coded instructions circuit m

21、odulation circuit, driving circuit, firing circuit of several parts. When pressed a key, the directive coding circuit, in the corresponding instructions encoded signal, the encoder signal to the carrier modulation, Driven by the power amplifier circuit after circuit fired from the field after firing

22、 instructions coded modulation signals. General receiver by the receiving circuit, the amplifier circuit, demodulation circuits, instruction decoder circuit, driving circuit, circuit implementation of several parts. Receiving Circuit will launch vehicles have been coded modulation signal receiving i

23、nstructions from, and to enlarge evacuation demodulation circuit. Demodulation circuit will have the coding modulation signal demodulation, namely, reduction of signal coding. The instruction decoder to the encoder signal decoding, Driven by the final circuit to drive the implementation of various i

24、nstructions circuit to control the operation.2 Infrared communication of knowledge2.1 infrared ray foundation knowledge2.1.1 infrared outlined Infrared is actually a kind of electromagnetic wave. From the analysis of various natural component of the electromagnetic wave reflected spectrum is :-ray,

25、x-ray, ultraviolet, visible, infrared, microwave and radio wave. From the viewpoint of form, and they did not seem to, but if the wavelength in descending order, and we will find him all the only visible light spectrum of the entire 0.38 m - 0.76m so long little area, and adjacent to the visible lig

26、ht and infrared (including the far infrared, mid-infrared and near infrared foreign) accounts for the spectrum of 0.76 m - 1000m 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 i

27、s a very rich spectrum resources, it currently has in production, life, military, medical, and other aspects have been widely used, such as infrared heating, medical infrared, infrared communication, infrared camera, infrared remote control, and so on. Infrared remote control is the many application

28、s of infrared part of the current household appliances widely used in TV remote control, VCR remote control, VCD remote control, high-fidelity audio remote control, are used infra-red remote control, It allows the control of these appliances have become very easy.2.1.2 infrared propertiesInfrared li

29、es between visible light and microwave a wave, it is with certain clinical characteristics of the wave. In the near-infrared, visible light and its adjacent, it is visible in certain characteristics, such as straight-line transmission, reflection, refraction, scattering, diffraction, can be certain

30、objects and can be absorbed through the lens of their focusing. In the far-infrared region, owing to its neighboring microwave, it has some characteristics of microwave, If a strong penetrating power and can run through some opaque substances. Since in any object, natural profession, regardless of w

31、hether its own luminescence (referring to visible light), as long as the temperature is above absolute zero (-273 C), moment will be kept around to infrared radiation. Only higher temperature of objects strong infrared radiation, low-temperature objects infrared radiation weaker. Therefore infrared

32、feature is the greatest common in nature, it is called thermal radiation called thermal radiation. Infrared cameras, infrared night market pyroelectric infrared detectors and some other missiles aiming at is the use of this characteristic of infrared work.2.2 infrared communication basic tenets infr

33、ared communication Principle Communication is the use of infrared wavelength of 900 nm-infrared waves from 1000 to serve as an information carrier, through infrared technology between the two close communication and confidentiality of information transmitted. Infrared communication system structure

34、include : part launcher, channel, the receiver part.Launcher source letter issued after the binary signal from the high-frequency modulated infrared LED sent, receiving device regard the reception of high-frequency signals from the infrared receiver tube after receiving further demodulation photoele

35、ctric conversion of the original information of a mass communication lose way. Afterwards the former Information received after receiving part of the drive circuit connected to the expected completion of the various functions. To which the modulation coding style pulse width modulation (by changing

36、the pulse width modulated signal PWM) and pulse modulation time (through change the pulse train interval time between the modulation signal PPM) two.红外遥控系统摘 要红外数据通信技术是目前在世界范围内被广泛使用的一种无线连接技术，被众多的硬件和软件平台所支持。红外收发器产品具有成本低，小型化，传输速率快，点对点安全传输，不受电磁干扰等特点，可以实现信息在不同产品之间快速、方便、安全地交换与传送，在短距离无线传输方面拥有十分明显的优势。随着红外数据

37、传输技术更加成熟、成本下降，红外收发器在短距离通讯领域必将得到更广泛的应用。本系统的设计目的是用红外线作为传输媒质来传输用户的操作信息并由接收电路解调出原始信号，主要用到编码芯片和解码芯片对信号进行调制与解调，其中编码芯片用的是台湾生产的PT2262，解码芯片是PT2272。主要工作原理是：利用编码键盘可以为PT2262提供的输入信息，PT2262对输入的信息进行编码并加载到38KHZ的载波上并调制红外发射二极管并辐射到空间，然后再由接收系统接收到发射的信号并解调出原始信息，由PT2272对原信号进行解码以驱动相应的电路完成用户的操作要求。关键字：红外线；编码；解码；LM386；红外收发器。1

38、 绪论11 课题研究的背景及意义红外数据通信技术是目前在世界范围内被广泛使用的一种无线连接技术，被众多的硬件和软件平台所支持。是一种通过数据电脉冲和红外光脉冲之间的相互转换实现无线的数据收发的技术。红外收发器产品具有成本低，小型化，传输速率快，点对点安全传输，不受电磁干扰等特点，可以实现信息在不同产品之间快速、方便、安全地交换与传送，在短距离无线传输方面拥有十分明显的优势。红外收发器产品在可携式产品中的应用作用很大。目前，全世界有1亿5千万台设备采用红外技术，在电子产品和工业设备、医疗设备等领域广泛使用。比如有95的笔记本电脑就安装了红外收发器接口,现在绝大多数手机上也配置红外收发器接口。而且

39、随着交换的数据量变大，红外数据通讯将使手机的数据传输越来越方便。随着红外数据传输技术越来越成熟、完善、成本更低廉，红外收发器在短距离通讯领域必将得到更广泛的应用。本章首先阐述了红外收发集成电路设计课题的背景和意义，然后简要介绍了红外数据通讯技术的特点和应用领域，以及红外收发器产品的特点、国内外现状和发展趋势，最后根据红外遥控收发系统的实际应用性确立了课题的设计定位。12 红外遥控收发系统简介红外遥控系统分为单通道遥控和多通道遥控。只有一个指令信号传送通道的称为单通道遥控系统;具有两个以上指令信号传送通道的称为多通道遥控系统。单通道遥控比较简单 ,一般来说 ,发射器仅有一个指令键 ,接收器也只有

40、一个执行电路。虽然在接收电路中加入多稳态记忆电路 ,可以根据按动发射器指令键的次数 ,使接收电路中的多稳态记忆电路的状态多次改变 ,实现多项功能控制 ,但是这种状态的改变是顺序进行的。如果要实现一项任意控制 ,就要采用多通道遥控系统。多通道遥控可以实现对被控对象的任意多功能遥控。至于选用几个通道及何种控制方式 ,要根据实际情况(如被控对象、操作要求及成本核算等)来决定。一般的红外遥控收发系统是由红外遥控信号编码发送器、红外遥控信号接收器和解码器（解码芯片或单片机）及其外围电路等三部分构成的。信号发送器用来产生遥控编码脉冲，驱动红外发射管输出红外遥控信号，接收器完成对遥控信号的放大、检波、整形并

41、解调出编码脉冲。红外遥控编码脉冲是一组组连续的串行二进制码，对于一般的红外收发系统，此串行码作为微控制器的遥控输入信号，由其内部CPU完成对遥控指令的解码，对其他各种红外遥控收发电子产品的设计者来说，上述的微控制器内部解码出的遥控指令是不便于利用的。因此，人们利用红外编/解码芯片及单片机研制出多种通用红外遥控收发系统，在各种设备之间进行红外信号的收发。遥控收发系统一般由发射器和接收器两部分组成。发射器一般由指令键、指令编码电路、调制电路、驱动电路、发射电路等几部分组成。当按下某键时 ,指令编码电路,产生相应的指令编码信号 ,编码指令信号对载波进行调制 ,再由驱动电路进行功率放大之后由发射电路向

42、外发射经过调制的指令编码信号。接收器一般由接收电路、放大电路、解调电路、指令译码电路、驱动电路、执行电路等几部分组成。接收电路将发射器发射的已调制的编码指令信号接收下来 ,并进行放大后送解调电路。解调电路将已调制的编码信号解调下来 ,即还原为编码信号。指令译码器将编码指令信号进行译码 ,最后由驱动电路来驱动执行电路实现各种指令的操作控制。13 红外遥控收发器产品概况1.3.1红外遥控收发器产品的结构和类型目前红外收发器按照工作模式和传输速率可分为四类：串行模式，最高速率为115.2Kbps；中速模式：最高速率为0.567Mbps和1.152Mbps；高速模式：最高速率为16Mbps。另外按芯片

43、功耗大小又可以分为低功耗型和标准型两类，低功耗型通常使用3V电源，传输距离较近，约0-30cm，标准型通常使用5V电源，传输距离较远最少1m以上。1.3.2红外遥控收发器的国内外现状在红外通信技术发展的早期，存在好几个红外通信标准，不同标准之间红外设备不能进行红外通信。为了使各种红外设备能够互联互通，1993年由20多个大厂商发起成立了红外数据协会（IRDA）统一了红外通信的标准，这就是目前被广泛使用的红外数据通信协议及规范，也称为IRDA标准。自1993年IRDA成立至今，红外数据协会的会员已经发展到150多个，IRDA标准已经获得了业界广泛认同和支持。已经开发出来的具备红外通讯能力的设备已

44、经有一百多种之多，红外模块的年装机量已经达到一亿五千万套。尽管现在有了同样是近距离无线通讯的蓝牙技术，但以红外通讯技术低廉的成本和广泛的兼容性的优势，红外数据通讯仍旧会在将来很长一段时间内在短距离的无线数据通讯领域扮演重要角色。由IRDA协会的资料表明，国外公司的红外收发器产品起步较早，已经形成了红外收发器的配套生产产业链。由以下部分组成：Sharp等公司主要提供红外发光二极管和光敏二极管；Agilent等公司主要设计制作红外收发芯片；Infineon等公司主要从事红外收发器封装；IBM、Microsoft等公司则推出红外数据收发器驱动程序和红外通信软件。其中如Agilent等公司还具有生产红

45、外收发器系列产品的能力，而HP、IBM等大公司则专门为自己公司产品配备红外收发器。在中国台湾地区也形成了一批红外收发产品的生产厂家和公司，但在大陆地区只有一些器件销售公司在做这些国际公司和台湾公司的代理，缺乏具有自主产权的该类产品。1.3.3红外收发器产品的发展趋势在各种红外收发器产品中，虽然传输速率、传输距离等特性不同，但红外收发器产品一直朝着提高传输速率，增加传输距离，降低功耗，扩大发射接收角度等方面发展。特别是随着技术发展和成熟，传输方式正朝着点对多点方向发展。因此红外遥控收发器产品还有更加宽广的发展前景。2 红外通信的基础知识21红外线基础知识2.1.1红外线概述红外线实质上是一种电磁

46、波。从分析自然界中各种电磁波组成的波可知，波谱是由 ：射线，射线、紫外线、可见光、红外线、微波和无线波组成的。从形式上看，它们之间似乎没有关系，但如果按照他们的波长依次排列，就会发现和我们形影不离的可见光只占了整个波谱中0.38m-0.76m长的这么一点儿范围，而和可见光相邻的红外线 （包括远红外线、中红外线和近红外线外）却占了波谱中0.76m-1000m的一大段。其中微米波长范围内又包括了紫外光 、可见光、近红外、中红外 、远红外、微波。从上述分析可知，红外线是一种十分丰富的波谱资源，目前它己在生产、生活、军事、医疗等多方面得到了广泛的应用，例如红外线加热、红外线医疗期间、红外线通信、红外线

47、摄像、红外线遥控等。红外线遥控只是红外线众多应用中的一部分，目前在家用电器中广泛应用的彩电遥控器、录像机遥控器、 VCD遥控器、高保真音响遥控器等，都采用了红外线遥控，它使这些家用电器的控制变得十分简单方便。2.1.2红外线的特性红外线是介于可见光和微波之间的一种电磁波，因此它具有相临波的某些特性。在近红外区，它和可见光相邻，因此具有可见光的某些特性，如直线传播、反射、折射、散射、衍射、可被某些物体吸收以及可以通过透镜将其聚焦等。在远红外区，由于它邻近微波区，因此它具有微波的某些特性，如较强的穿透能力和能贯穿某些不透明物质等。在自不论任何物体，然界中，也不论其本身是否发光 （指可见光） 只要其

48、温度高于绝对零度 （-273），都会一刻不停地向周围辐射红外线。只不过是温度较高的物体辐射的红外线较强，温度低的物体辐射的红外线较弱。因此红外线的最大特点是普遍存在于自然界中，又叫做热辐射线简称热辐射。红外线摄像、红外线夜市、热释电红外探测以及某些导弹的瞄准等就是利用红外线的这一特性工作的。红外线和可见光相比的另一个特点是，色彩丰富多样。由于可见光的最长波长是最短波长的1倍（780nm-380nm），所以也叫作一个倍频程。而红外线的最长波长是最短波长的1倍，而红外线的最长波长是最短波长的10倍，即有10个倍频程。因此如果可见光能表现为7种颜色，则红外线便可能表现70种颜色，显示了丰富的色彩。红

49、外线透过烟雾的性能好，这是它的又一个特点。22红外通信的基本原理 红外通信的工作原理红外通信是利用波长为900nm-1000nm的红外波作为信息的载体，通过红外技术实现两点间的近距离保密通信和信息的转发。红外通信系统组成结构包括:发射器部分，信道部分，接收器部分。发射装置把信源发出的二进制信号经过高频调制后由红外发光二极管发送出去，接收装置把接收的红外高频信号由接收管接收后经光电转换再解调为原来信息的一种通信传输方式。再接收到原信息后可在接收部分连接驱动电路以完成预期的各种功能。其中对编码的调制方式有脉宽调制（通过改变脉冲宽度调制信号PWM）和脉时调制（通过改变脉冲串之间时间间隔调制信号PPM）两种。.