本文阐述一个基于DSP的四路实时音视频采集压缩终端的硬件设计和实现过程。重点讨论了基于TMS320DM642主处理芯片的音视频处理系统的设计，另外对存储电路、网络接口、IIC接口和电源等模块也做了深入讨论。最后对硬件做了信号仿真，指出电路设计和PCB布局布线的关键要点。软件测试结果表明，视音频主观质量较优，系统硬件工作稳定可靠，具有通用性。

This paper proposes a scheme of the hardware design of a fourchannel realtime video coder. The paper focuses on the design of the core chips of TMS320DM642 and the audio/video chips. In addition, the storage, Ethernet, IIC and power source modules are discussed. Finally, signal simulation is discussed and some keys of PCB layout and route are proposed. The software test results prove the hardware works well and produces good visual audio/video quality.