The Design And Development Of Digital Telephony Terminal System Based On DSP

In the area of digital communication,the capability of memory and the quality of communication two pivotal matters.Thetraditional simulated telephony can only transfer voice signal,the capability of imformation is limited and the quality of communication is not ideal.All of these restrict its development.Many kinds of digital telephony terminal constantly appear,they bring much huge convenience to people.Especially the memory capability of digital telephony is big and the speech quality of digital telephony is good.The digital telephony has obvious superiority than simulated telephony.This paper designs and empolders a digital telephony termination system based on DSP aiming that status.Firstly,this paper analyses the study actuality and the development trend of telephony technique,pointing out the localization and shortcoming of simulated telephony,analyses the application value of digital telephony and the study significance of the task.Secondly,accordings to the technique guideline and function request,this paper presents collectivity blue print,desighns and empolders the hardware system based on DSP,presents the principle and solution of all th system.Discusses the principle and design solution of DSP system module,flash module,AGC module,RS232 interface module,JTAG module ,the connect cuicuit between DSP and SCM.Thirdly,designs and empolders software of system,and expatiates the collectivity design idea of software,designs and achives two modules of software:the module of DSP system software and the module of SCM software.presents the design solution and the achievement of code.Fourthly,this paper debugs the samole circuit board and gets the experiment results,analyses the experiment data.In the moment of debugging ,this paper presents the ameliorated solution of problem in the experiment.Finally,through the debug to the sample circuit board,it can be indicates that the system realizes the simulation of the technique in digital telephony system,signal wavelines.voice quality and anti-jamming ,etc are fit for the standard of design.Systen can run stably and reachs the expected design aim...