It accounts for, in detail, the content and performance of USB protocol with USB being the communications protocol, and DSP the central processor, and thus processing some basic digits on the basis of this data collection system. 以USB作为下位机与上位机的通讯总线,以DSP作为核心处理器,详细论述了USB总线协议内容及实现,并且以此采集系统为基础实现了一些基本的数字信号处理。