Research And Development, Of Common Ic Card Phone Smart Anti-theft Fight

IC card public phone is it play and is it play problem whether telecommunication operator and IC card public telephone production firm care about and not worried to wait an important issue that solve together to guard against theft to steal. Because is it play at first is it monitor line parameter to needing to guard against theft, change , line of parameter judge that conversing or stealing and sending normally according to, and then take the corresponding control measure, and this course monitored , judging , controlling is a intellectual decision-making process in fact, propose public IC card telephone intelligence reseach and this subject of development to guard against theft fighting device too.This thesis classifies and carries on the most detailed analysis to various kinds of methods to free call on somebody else's expense through illegal means at first. Produce through on-the-spot simulation each is it play operation course of method to steal , is it steal principle realized to play to analyse, and detailed all kinds of record is it play method realize course typical change of parameter to steal.Secondly, thesis and then according to a large number of data and materials that get live, is it is it play to every guarding against theft of way play the scheme to steal to make, overall design principle of the making device that and has proposed guarding against theft. Namely possess and defend various kinds of and steal the function made , and can't influence the normal work of the IC card microphone . It is a microphone plucking machine of IC card that the guarding against theft and hitting device must measure and judge , steal and make the microphone plucking machine . If is it play microphone person who pluck to steal, it judges to be which kind of steal method of playing, play according to corresponding guarding against theft scheme prevent from and then. Unless if it is IC card microphone plucking machine, it measure it have not stealing by phenomenon of playing,without, judge it for the normal conversation of the IC card microphone, the making device is in the state of monitoring to guard against theft, do not have an effect ; If have, it judges to be which kind of steal method of playing, play according to corresponding guarding against theft scheme prevent from and then.This course measured , judging and preventing from is all realized through one-chip computerand relevant circuit, it reflect single slice to guard against theft person who play quick-witted to can control application fully.Then, thesis structure the concrete hardware circuit and write the software procedure according to the overall design plan. Adopt PIC16C711 one-chip computer chip that Company produce , Microchip of U.S.A. , come as key device to guard against theft the fighting device. Utilize single slice quick-witted to can control, guard against theft person who play design for one pair of end types, adopt between intelligence and yards of theft-proof technology, is it is it discern IC card microphone person who pluck and IC card microphone person who pluck to move to come from, set up the measuring circuit in such circuit parameters as the voltage of the electric current ,etc. in addition, strengthen the measuring and protection of the whole circuit, is it is it steal phenomenon of playing to have to judge , is it cut off line , take place high-frequency interfering signal means is it prevent realization fought to steal from to come to adopt at once.Finally , carry on generous and repeated on-the-spot test and test run through some offices of districts and cities in the province, get firsthand on-the-spot test data, is it is it guard against theft person who play is it play adaptability (include various kinds of theft-proof function and different environments ) and stability of function to guard against theft to measure to come. Find out various kinds of environment to guard against theft generality that require of playing etc. , is it is it is it play design and perfection of function to guard against theft to guide to come. In addition guard against theft situation of fighting device make a brief analysis of economic benefits installing and using also.