Red 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 scaled turn, the baud rate be quick, point to point SSL, be free from electromagnetism thousand Raos 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 advantage.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 customer’s operation information 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 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 attian enough power. The receive circuit receive the signal and demodulate original information. The original signal was decoded by PT2272, so as to drive some circuit to accomplish customer’s operation demand.

Keywords:Infrare dray；Code；Decoding；LM386；Redoutside transceiver


摘 要
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。紅外收發(fā)器產(chǎn)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(chǎn)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。紅外遙控收發(fā)系統(tǒng)的設計在具有很高的實用價值，目前紅外收發(fā)器產(chǎn)品在可攜式產(chǎn)品中的應用潛力很大。全世界約有1億5千萬臺設備采用紅外技術，在電子產(chǎn)品和工業(yè)設備、醫(yī)療設備等領域廣泛使用。絕大多數(shù)筆記本電腦和手機都配置紅外收發(fā)器接口。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(chǎn)的PT2262，解碼芯片是PT2272。主要工作原理是：利用編碼鍵盤可以為PT2262提供的輸入信息，PT2262對輸入的信息進行編碼并加載到38KHZ的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。