【導(dǎo)讀】據(jù)通信技術(shù)，其得到許多的軟硬件平臺支持。紅外收發(fā)器產(chǎn)品的特點(diǎn)有成本低，著相當(dāng)明顯的優(yōu)勢。紅外遙控收發(fā)系統(tǒng)具有很強(qiáng)的實(shí)用意義，目前紅外收發(fā)器。產(chǎn)品在便攜式產(chǎn)品中有著很大的應(yīng)用潛力。隨著紅外數(shù)據(jù)傳輸技術(shù)更加成熟、成本下降，紅外收發(fā)器在短距離通訊領(lǐng)域必將得到更廣泛的應(yīng)用。其中編碼芯片使用的是PT2262，解碼芯片使用是PT2272，他們。其主要工作機(jī)理是：我們使用編碼鍵盤為PT2262輸入信息，輸。PT2272進(jìn)行解碼，以此驅(qū)動對應(yīng)的電路完成用戶的操作請求。其屬于一種通過數(shù)據(jù)電脈沖和紅外光脈沖之間進(jìn)行轉(zhuǎn)換從而實(shí)?，F(xiàn)無線數(shù)據(jù)接受和發(fā)送的技術(shù)。展趨勢，最后根據(jù)紅外遙控收發(fā)系統(tǒng)的實(shí)際應(yīng)用性確定了課題的設(shè)計目的。為單通道遙控系統(tǒng)，具有兩個以上指令信號傳輸通道的稱為多通道遙控系統(tǒng)。紅外遙控編碼脈沖是一組一組連續(xù)的，串行的二進(jìn)制碼，對于大多數(shù)的紅外收發(fā)系。指令是不易深入的。接收電路接收發(fā)射器發(fā)射的已調(diào)制的編碼指令信號,并對其進(jìn)行放大后

　　

【正文】 hape is similar LED light emitting diodes, Its basic circuit shown in figure 2 2. The triode plans for the switch, when the base added a driving signal, Transistor saturated conduction infrared LED D is also Wizard Link, issued infrared (near infrared about μm). D. The pressure drop of about V and the current general for 1020mA. To adapt to the working voltage of the D loop resistance often as a series of infrared diode current limit resistance. When the circuit diagram of the infrared emission control corresponding to the controlled device, the control of the distance and D is proportional to the transmitting power. In order to increase the distance of infrared control, infrared diode D should work on the pulse state that work is the lifeblood of current. Because pulse light (optical modulation) the effective transmission distance and pulse is proportional to the peak current, only maximize peak current Ip, will increase the infrared distance. Ip increase is a way to reduce the pulse duty cycle, that is pressed pulse width τ some TV infrared remote control, its infrared luminescence of the pulse duty cycle of about 1/41/3。 Some electrical products infrared remote control, its duty cycle of 1 / 10. Decreasing pulse duty cycle also enable lowpower infrared LED distance of the greatly increased. Common infrared light emitting diodes, power is divided into small power (1 mW 10mW). Chinese power (20mW 50mW) and power (50mW 100mW more) three categories. Use different power infrared LED, the allocation should be driven by the corresponding power control. Figure 2 2 by the reflected infrared lightemitting diodes to make produce optical modulation, Drivers only need to add the control of a certain frequency pulse voltage. Infrared transmitter and receiver in the way the two kinds of straight, and the second is reflective. Luminescence pointed straight pipe and tube receiver placed in a relatively controlled and fired on the two ends, a certain distance away from the middle。 Reflective means luminescent tube and pipe parallel with the receiving peacetime, without always receiving tube light, luminescence only in possession of the infrared light reflected from encountered, the receiving tube received from the reflected infrared before work. infrared munication basic tes infrared munication Principle Communication is the use of infrared wavelength of 900 nminfrared waves from 1000 to serve as an information carrier, through infrared technology between the two close munication and confidentiality of information transmitted. Infrared municatio n system structure include : part launcher, channel, the receiver part. Launcher source letter issued after the binary signal from the highfrequency modulated infrared LED sent, receiving device regard the reception of highfrequency signals from the infrared receiver tube after receiving further demodulation photoelectric conversion of the original information of a mass munication lose way. Afterwards the former Information received after receiving part of the drive circuit connected to the expected co mpletion of the various functions. To which the modulation coding style pulse width modulation (by changing the pulse width modulated signal PWM) and pulse modulation time (through change the pulse train interval time between the modulation signal PPM) two. infrared munication system elements (1) Launches : Currently there is a infrared wireless digital munications system sources of information including voice, data, images. Its methods of work for the launch of the receiver can be divided into different layout LOS way (LightofSight , intracardiac way), diffuse (diffuse) mode. LOS way directional, it has good channel characteristics such advantages, but the existence of a shadow effect. difficult to achieve roaming function. Roaming means the main features of nondirectional, and easy to implement roaming function, but its channel quality is better sometimes LOS way. Transmission of signals required for a few of (the sampling was quantified), the general need for baseband modulation, transmission, modulation, sometimes signal source coding, the abovedriven signals from photoelectric converter plete optical signal transmission. Infrared wireless digital munications system and its scope of workforfired power distribution, the quality of the munication. While using various methods to improve optical transmitter power, the other using spatial diversity, holographic films and so on so diffuse light for the launch of space optical power evenly distributed. (2) Channel : infrared wireless digital munication channel refers to the transmitters and receivers in the space between. Due to natural light and artificial light sources such as light signals in the context of intervention, and the source Electrical Equipment, The optical noise and disturbances, infrared wireless digital munications in some occasions, poor quality, At this point needed to channel coding. Infrared wireless munication system, the optical signal reflection, light scattering and background noise and interference effects, Infrared wireless digital channel presence multipath interference and noise, This is to improve the quality and access for highspeed applications should be addressed. Infrared wireless digital munication channel often used by the major optical ponents, optical filter, condenser, their role is : plastic, filter, depending on the field transformation, the band division, the lens can be used as launchray focusing, the use of optical filters filter out stray light, the use of optical lenses to expand the field of view receiver, able to make use of optical ponents for the link frequency division multiplexing, etc.. Infrared wireless munication channel optical noise : the natural noise (sunlight) and anthropogenic