Digital Discrete Method for Oversampling

Abstract:

Traditional discrete method, converting order continuous system to order difference equation, describes system using the information of sampling points. But the system response in the time of will not be sufficient to describe the system when sampling period is much larger than the bandwidth of the system. By analyzing differential discrete method, our design gives an improvement to take out of the influence of the system bandwidth. In this method, order continuous system is transformed into order difference equation and the information of sampling points can be used to describe the system. It is proved that modified difference transformation is better in interference rejection than traditional difference transformation by comparing the simulation between the two transformations. The hardware implementation using TI's TMS320F2808 shows that modified difference transformation has a deviation close to round-off error based on simulation with a linear increase of operating time.

• Periodical: Applied Mechanics and Materials (Volume 389)
• Pages: 901-907
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.389.901
• Online since: August 2013
• Authors: Yan Chao Bi, Xiao Xian Yao, Xiao Dong Song
• Keywords: Discrete System, Mode Increased-Order, Transform Function Discrete

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