The Design And Implementation Of Number Recognizing System Based On DSP And CPLD

Number is the order numeral of object which alongs with people and plays a more and more important role in people's life. At first, it can sign the unique of an object as it is the characteristic symbol of many things, such as the number of banknote, identity card, passport, and so on. Second, number can facilitate live of people as providing the necessary information for them. For example, the number of ammeters, water meters, and gas meters, can be the basis for the consumption and the charge. Therefore, the issue of automatic identification of numbers, is more and more attention as a hot current research.Now, there are many independent number recognizing systems based on SCM(Single-Chip Microcomputer) and DSP (Digital Signal Processor), such as banknotes number recognizing system, passport number recognizing system and water meter automatic reading system. The independent number recognizing systems have shortcomings such as incompatible, expensive, repeated studies,it is not conducive to research and develop the number recognizing system in future.The issue of number recognizing is the same type of problem and can be solved by a common solution.A generic number recognizing system based on DSP and CPLD (complex logic programming device) is designed to solve the problems in this thesis. The main contents to be researched in this thesis are construct the hardware platform and design the software program. The constructive of the hardware platform adopt the DSP and the CPLD as the core of the solution.The number recognizing system is composed by signal collection module, signal processing module, logic control module, LCD display module and USB signal transmission module.The DSP is used to operate identify algorithm and the CPLD is used to control the sequential logic of system.This thesis finished the design of the PCB (printed circuit board) and compile of the program of the system.The system can carry out the sample collection,pre-dispose,storage,display,and data transfers of the identify obeject effectively in the debugging.The number recognzing system designed in the thesis has the advantages such as high universality, simpleness interface, good ability of upgrade and so on. It can solve the problems of number automatic identification efficiently to replace the circuit of the sensor and adopt the correspond identify algorithm based on the universal system.The design and implement of the universal number identification system has important referrence value to solove the problems of digital meter number recognizing, banknotes number recognizing, identity card recognizing, passport number recognizing and so on.