基于前/后台系统的嵌入式VoIP电话终端的设计与实现

Design and application of embedded VoIP terminal based on foreground/background system

根据实际从事项目开发过程,提出了一种高性价比的VoIP电话终端设计方案,并从系统设计、硬件设计和软件设计3个方面做了较深入的剖析。该系统采用双处理器结构,与8051指令兼容的8位控制器以及与AD SP2181指令兼容的语音运算DSP处理器,向外提供Ethernet、键盘、LCD等接口,该方案软件上采用嵌入式常用的前/后台系统。

The origin and system architecture of the VoIP is introduced and the necessity of developing VoIP terminal is explained.A VoIP terminal solution with high performance-cost ratio is presented.The VoIP terminal is analyzed for the system design,hardware design and software design,The system provides an interface of the Ethernet,keypad,LCD,etc.The application is designed as a foreground/background system.