中文摘要：

彩铃业务是一种可以让用户自己定制回铃音的增值服务。介绍了一种使用S3C444B0和单片机以及数字交换芯片MT8980实现彩铃功能的设计思想和实现方法,给出了详细的硬件结构图和软件代码。

英文摘要：

The coloring ring back tone service is an added value service through which the user can order the ring back tone himself. The design concepts and methods of the realization the coloring ring back tone function service have been introduced in this paper by using the chips S3C444B0, single mieroeontroller and switching chip MT8980 , and the hardware architecture and software code are also provided in detail. The system has simple constitution, good stability and reliabilaity.