该系统基于TMS320F2808实现，用来检测和重建复合频率信号中的主次信号。该系统由计算模块、重建模块和通讯模块组成。为了能在实时运行中自适应地确定采样频率，我们采取了“eCAP+AD”的方法，eCAP模块记录下整形后的复合信号的上升沿过零点时间值并估计出主频率，从而使系统能自动地选取合适的采样频率完成AD采样过程。系统采用了4096点的FFT算法，能够实现高达0.25Hz的频率分辨率，相对分辨率达到0.05%。(The system is based on TMS320F2808 to detect and reconstruct primary and secondary signals in composite frequency signals. The system consists of a calculation module, a reconstruction module and a communication module. In order to run in real-time to adaptively determine the sampling frequency, we adopt "eCAP+AD" method, the rise of eCAP composite signal module record after shaping along the zero crossing time and estimates the value of the main frequency, so that the system can automatically select the appropriate sampling frequency to AD sampling process. The system adopts 4096 point FFT algorithm, which can achieve up to 0.25Hz frequency resolution, and the relative resolution is 0.05%.)