史芳芳外文翻译.doc

wireless remote control 41 外文翻译及原文外文原版 How Remote Controls Work Wireless remote control means to achieve the objectives of the charged non-contact re mote control, in industrial control, aerospace, consumer electronics applications. Wire less remote control and wireless transmission systems with cable and infrared equipm ent to enhance the mobile pared. This wireless remote control devices an d wireless transmission systems in industrial applications is increasing. Cable to conn ect the relative advantage of low installation costs (no wiring, no underground works, there isno cable trough), increased flexibility and reduced maintenance costs. Wireless Remote Control Category Wireless remote control system of the type and classification of many, the main meth ods are: ① transmission control directives by the carrier signal is divided into: radio r emote control, infrared remote control, ultrasonic remote control; ② encoding in acco rdance with sub-signals: frequency encoding and pulse code; ③ by the transmission c hannel is divided into: single-channel and multi-channel remote control; ④ according to the same time the number of instructions can be transmitted is divided into: single-c hannel and multi-channel remote control; ⑤ command signals in accordance with the objectives of the control technology was charged as follows: switch-type the proportio nof type remote control. Wireless remote ponent Remote control system in general by the transmitter and the receiver posed oft wo parts. General by mand transmitter key, instruction encoding circuit, modu lation circuit, driver circuit, firing circuit, such asa few parts. Instruction encoding cir cuit encoding the instructions to produce signals encoding instructions to the carrier m odulation signal, and then carried out by the drive circuit power amplifier circuit out b y the launch after launch of mand modulation signal encoding. Receiver gener alby the receiving circuit, amplifier, demodulator circuits, instruction de