Design And Implementation Of Voice Communication For Elderly Accompanying Terminal

China is the world's most populous country in the elderly.Because of the total population aging,empty nest oriented elderly life care,nursing and other issues have become increasingly prominent,and the old at home alone is very interest:ing,pension has become a new topic in the construction of socialist harmonious society.In order to solve the problems existing in the Elderly Security and access to information and provide a safe,information-based home environment for the elderly at home,the design of this paper has important practical significance.The paper starts from the overall elderly companion system point of view,according to the needs of elderly accompanying terminal and the needs of terminal voice communication,this paper describes the accompanying terminal of voice communication for elderly from two aspects of hardware and software,the main work is as follows:(1)The paper first analyzes the advantages and disadvantages of product research on elder accompany terminal on the accompanying endowment at home and abroad,then analyzes the research status of voice communication.Introduce and analyze some key technologies of the teminal,focuses on the analysis of the echo cancellation technology.On the basis of the overall project implementation framework and requirements,select the appropriate operating system,finally determined to use TI company's DM365 as the core processor,AIC3101 as the codec chip voice communication,using FM1188 chip as the United States Fudi company echo cancellation chip.(2)With TMS320DM365 as the core processor,the paper use TLV320AIC3101 as the codec chip in voice communication to design the circuit,sunch as voice codec circuit,power amplifier circuit and the circuit design of echo cancellation.(3)Based on Linux embedded system and according to the requirements of voice communication in elderly accompany terminal,describe the software design of the voice communication of the terminal in detail,such as the voice codec and echo cancellation chip driver design,the application of voice codec design,software design of full duplex voice communication software design and a design of a call and cluster intercom.(4)To test the performance of voidce communication of the elderly accompany terminal,the paper mainly do the test for voice packet loss rate and delay rate,echo cancellation effect test,call test and the test of results are compared,analyzed and summarized.