Abstract
This text emphasizes to introduce the red unauthorized biography to lose the principle and the design methods and collects the application in the system in the data .The Hence wear the technical development of electronics, the the red and outside technique gets the more and more extensive application, the because the controls from a the distance outside the not contact type, the anti- interference the ability is the very strong, this provided for the customer conveniently manipulate the means and extend it applies the realm of prior condition. Currently this technique has already got the application in data collect system.Though had the blue tooth technique of the close quarter wireless communication now, but red and outside communication technique with its cheap cost and extensive of and permit sex advantage. Because the common and red and outside communication technique is very difficult to make the line form processing( can't enlarge to deliver directly) towards imitating the signal, but if combine the technique of PWM and can pass the numerical form to the emulation to deliver dependablely. It's the red foreign language sound communication system's turn to be applicable to the short distance communication situations, such as the , athletic field, conventional center of the high building and multi-media equipments...etc., compared with the wireless technique, that technique manufacture is simple, the cost is low, system stability, the credibility is strong, and have the higher economy and function, so have vast of applied foreground.
Keywords:The frequency make;The frequency solution adjust;Place before greatly;Four operations enlarge
