Study On Multi-Channel Parallel Digital Signal Processing System

The multi-channel parallel digital signal processing system takes an import-ant part in the apparatus and instrument, as well as in detecting signals. At pres-ent, kinds of products have already existed in the market, but most of them havedefects in the real-time property, dynamic range and etc. To solve these proble-ms, the improvement and realization are given in the paper. The multi-channel parallel digital signal processing system designed in thepaper is a high precise data sampling and signal processing system. The comp-lex interface circuit between CS5381 and DSP is realized by FPGA with VHDLin this paper. The circuit mainly includes synchronous multi-channel high prec-ision A/D conversion control, data pre-processing, interruption, data buffering(asynchronous FIFO) and etc. In the system, there are two schemes to realize theasynchronous FIFO: one is based on IP core, the other is based on VHDL. Bothof the schemes are implemented and also compared in the paper. Adopting FPG-A to realize the whole control circuit is the significant improvement of this pap-er. It not only improves the integration, but also ensures the security of the sys-tem. Meanwhile, the data to be processed is too much, and the real time demandis quite strict in the system, so it is very difficult to realize filter using softwareprogramming. To solve this problem, FIR filter based on distributed algorithmand CIC filter are realized by FPGA in the paper. Thus, the real-time property ofthe system is ensured.In the system based on the scheme that referred in this paper, the dynamicrange of the output signal can reach about 100 dB. The system is especiallyapplicable to the field of the high accuracy measurement, weak signal detectingand etc. It is very easy to extend by demand, so it has general application value.