基于DSP的语音通信系统，含全部源码和完整电路图。本电路图注重于USB2.0、RS232、以太网的连接方法以及外围电路设计，为读者提供一个完整的电路实例。而C6713电路部分，只涉及C6713与三个器件的连接关系，至于C6713的其他部分（如SDRAM、FLASH等）都略去,读者可参考另外相关的章节。-DSP-based voice communications system, complete with all source code and schematics. The diagram focuses on USB2.0, RS232, Ethernet connection method and the external circuit design, providing readers with a complete circuit instance. The C6713 circuit, only involves the C6713 and the connection of three components, as in other parts of C6713 (for example, SDRAM, FLASH, etc.) are omitted, the reader may refer to other relevant chapters.