The main force in data communications - Infrared Communication Technology _2299

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The main force in data communications - Infrared Communication Technology
 
 
  【Papers Key words: infrared communication; data communication   【Abstract】:  in many microcontroller-based application system, the system needs to realize remote control, and infrared communication is being used more methods. Infrared communication with the control is simple, easy to implement, transmission and high reliability, is a more common means of communication.   Microcontroller-based applications in many systems, the system needs to realize remote control, and infrared communication is a method to be used more. Infrared communication with the control is simple,You are not allowed to view links. Register or Login, easy to implement, transmission and high reliability, is a more common means of communication. Infrared communication is a cheap, short distance, wireless, low-power, secure and strong communications program, mainly used in short-range wireless data transmission, also used for short-range wireless network access. IRDA norms from the early (115200bps) to ASKIR (1.152Mbps), to the latest FASTIR (4Mbps), increasing the speed infrared port, infrared port and the computer use of information communications equipment is also increasing. Infrared port is to use a directional infrared communication, and because of its shorter wavelength, the diffraction of the obstacles poor, only suitable for short-range wireless communication of the occasion, the in small mobile devices access to a wide range of applications.    1. The basic principles of infrared communication    infrared communication is the use of near infrared 950nm infrared as the transmission of information media, that communication channel. The sending end the baseband signal modulated to a series of binary pulse train signal, through infrared emission infrared emission control signal. Receiver will receive the light pulse into electrical signals, and then after amplification, filtering, demodulation circuit after demodulation to give, after reduction to a binary digital signal output. Commonly used to achieve the signal through the pulse width modulated pulse width modulation (PWM) and by the time interval between pulse trains to achieve when the signal modulation pulse modulation (PPM) in two ways.  In short, the infrared communication is the essence of the binary digital signal modulation and demodulation in order to use infrared transmission channel; infrared communication interface is a channel for the infrared modem.    2. Infrared communication technology features    infrared communication technology is now widely used worldwide as a wireless connection technology, many of the hardware and software platform supports:  ⑴ electrical impulses through the data and infrared light pulses to convert between wireless data transceiver;  ⑵ main point is to replace the cable connection;  ⑶ new Early communication standards-compliant communication standard;  ⑷ small angle (cone angle of 30 degrees or less), short-range, point-line data transmission, confidentiality and strong;  ⑸ higher transmission rate, the current rate of 4M FIR technology has been widely used, 16M rate VFIR technology has been released.    3. The use of infrared data communication technology    infrared communication technology is often used in the following devices:  ⑴ notebook computers, desktop computers and handheld computer;  ⑵ printer, keyboard, mouse and other computer peripheral equipment;  ⑶ telephones, mobile phones, pagers;  ⑷ digital cameras, calculators, game consoles, set-top boxes, watches;  ⑸ Industrial Equipment and medical equipment;  ⑹ network access devices such as modems.