Digital Speech Talkback System Based On Embedded Modem

The pronunciation talkbacks system is an important component of the intelligent service of the district. It controls dynamics safely in improving the district, improves the efficiency of management of the district and guarantee that resident's life and material property all playing very important influence. In order to meet the scale of real estate construction and need of intelligent construction of the district at present, the pronunciation talkbacks system is changed into the complicated and distributed digital speech system from the simple simulation system gradually, and it has got very great improvement in such aspects as stability , multifunctionality and long distance communication that the pronunciation talkbacks. Our country in recent years introduce digital speech talkback system, and begin to research and develop independent figure of intellectual property right talkback the system too, talkback this piece still blank place, this text to of our country district figure talkback system design issue launch research at present in district.This text analyses and compares about the digital speech system and simulation pronunciation system at first, have explained and talkbacked the systematic necessity in the installation figure of the district, recommended talkbacking at present at the same time systematic structure , operation principle , result of use ,etc. The article realizes to digital speech, transmission means and embedded system mainly from the theory and angle used that three directions have carried on research:Through compressing the principle of the code and carrying on the theoretical research to pronunciation signal model and pronunciation, enumerate several kinds of popular digital speech code agreement and way at present , has summarized their application in different fields, then choose suitable digital speech code agreement G.729.A, and has analysed and derived about the principle of its compiled code, and has explained the realization way in this design.It is imitated many kinds of pronunciations of the system at present that through comparing to transmit the comparison which realize the way, have proposed that because of the implementation method based on embedded modem, and has introduced the design of embedded modem in detail. Debug the experimental result and indicate , can transmit the pronunciation code data steadily effectively in this method, can reach and is scheduled to convey at a long distance .The article, after proposing realizing and transmitting the method in the pronunciations of G.729.A + embedded modem, have designed and developed 32 ARM processor based on ML67Q4051 and software and hardware of the embedded technology of uC/OS-II operating system. Expound the fact figure talkback system structure and each function design of part of hardware in detail, and has developed the software of the corresponding function module . The subject is still realized on the embedded software, has proposed a kind of software structure with higher portability.The experimental result shows , figure talkback system reach stability , pronunciation of communication , is it arrive good result very to fetch at long distance communication, and has put forward the solution of talkbacking on the basis of the three sides. Structure that the way of adding embedded modem of the digital speech has changed the traditional district and talkbacked, having improved work quality and maintenance efficiency of talkbacking in the district, and the one that has reflected the embedded system is good and intelligent.