多阶采样原理及其应用

Principle and Its Application of Periodically Nonuniform Sampling

介绍了用滤波器组重构多阶采样信号的原理 ,并且利用多阶采样特殊的重构原理以及在降低采样率上的优势 ,介绍了多阶采样在频率选择上的应用。本文利用“频率特性解析关系”确定采样参数 ,利用采样参数的变化控制选取频带。实验证明 ,用滤波器组重构多阶采样信号能达到较高的精度 ,用多阶采样实现频率选择能达到用硬件滤波器选频的效果。

The principle of the reconstruction from periodically nonuniform samples using filterbanks is introduced. By using the special reconstruction principle and the superiority in decreasing sampling frequency,the application of periodically nonuniform sampling in frequency selection is also presented. This paper uses the change of sampling parameters to control the frequency band to be selected. Experiments prove that the reconstructing from periodically nonuniform sampling using filetrbanks can reach a higher precision and using periodically nonuniform sampling to realize frequency selection can reach the same effect that hardware filters do.