Design And Implementation Of Embedded Monitoring And Recording System To Radio Communication

A monitoring and recording system is designed and finally realized based on the special recording requirements in radio communication.In order to design a voice recorder which has large storage capacity,reliability,compact size and low cost,the principle of embedded system and digital signal processing algorithms are analysed and studied.Based on the adaptive noise reduction with LMS algorithm the signal quality was improved after noise absorption.The transplantation ofμC/OS-Ⅱand processing program in ARM microprocessor was achieved.According to the actual situation embedded sound processing system is designed with the network interface technology of embedded system based on DM9000 board and with the ARM chip and semi-conductor storing technology. The system can finish the operations to remove noise,compress,store,load,play and network-transmit multiple sound data with the kernel of embedded and periphery circuits.And according as the principle of the system,not only the mainboard but also the interface circuit is designed.During six months trial operation,the on-site experience has shown that the system is very stable and various performance indexes meet the design requriements.This system is also used to record maritime,bus and other common-occasions radio communication expediently,and has a bright project application prospect.