基于局域网的IP电话终端系统

在分析IP电话工作原理、组成结构的基础上,提出一种基于局域网的、以语音通信为主、兼有数据传输的IP电话终端方案,旨在解决IP电话相关的关键技术,完成语音IP包在局域网内的高质量传输,实现在局域网内部进行语音传输的IP电话终端,从而以较低的成本实现家庭网络的语音和数据传输功能,推进IP电话在普通家庭的应用与普及.试验证明:该系统通话效果比较好,基本实现了设计目标.

IP phone terminal system based on LAN

The scheme for IP phone terminal was put forward after the principle and structure of IP phone were analyzed,which is based on LAN and can transmit both speech and data.In the scheme,the core of speech processing was a special coding and decoding DSP chip CT8020 with low data rate for compressing speech.The CT8020 was controlled by AN2131QC,which is a microprocessor EZ-USB chip AN2131QC with USB interface.Then it was connected to LAN using the Ethernet controlling chip,at the same time,the peripheral equipment was equipped,such as PCM coding and decoding chip,keyboard and LCD display.During the research work,the transmission of speech IP package with high quality in LAN was accomplished firstly because of the solution of the key technology of IP phone,and the IP phone terminal with transmission of speech in LAN was achieved at last.