Design And Implementation Of Nonuniform Sampling System Based On DSP

The theory of digital signal processing, based on Shannon uniform sampling theorem, is perfect and has been applied widely in various fields. But, in the practical engineering, the disadvantages of Shannon sampling theorem result in some problems. This paper illuminates the theory and application of nonuniform sampling, and develops a hardware system to implement nonuniform sampling based on DSP.The paper starts with introducing the Fourier Transform based on theory of Shannon uniform sampling and deducts the Fourier Transform of nonuniform sampling. After discussing the effect on accuracy of frequency spectrum resulting from the jitter of sampling clock, the paper advances nonuniform cyclic sampling, which is a practical nonuniform sampling, and analyses its special performance.At the implementation part of nonuniform sampling, the paper expounds the way to realize the nonuniform sampling, and establishes the hardware implementation scheme based on DSP, CPLD and USB2.0. Then the software programming of nonuniform sampling is presented. At last, in the sixth chapter, the paper shows the actual measure results and the performance of the above system.This paper discusses the foundational theory of nonuniform sampling in detail, and reveals the advantages of nonuniform sampling comparing with the uniform sampling. Based on above system, it is proved that the excellent capability of nonuniform sampling is effective.