Limiting filter method and system

• Main Authors: HE CONG, YANG DACHENG, JIANG YAOWEI, ZHOU YANG, XU GUANGZHAO, KANG GUOLIANG, DING XIAOFAN
• Format: Patent
• Language: Chinese; English
• Published: 19.03.2019
• Subjects: CALCULATING; COMPUTING; COUNTING; HANDLING RECORD CARRIERS; PHYSICS; PRESENTATION OF DATA; RECOGNITION OF DATA; RECORD CARRIERS

The invention provides a limiting filter method, which comprises the following steps: determining a maximum deviation value allowed by two adjacent sampling data; detecting and acquiring new sample data present in a register queue for buffering sample data; performing differential comparison of the new sampled data with the previous sampled data; based on the result of difference comparison, the calculation rule of filter output value is selected and the filter output value is obtained. The trend of the sampled data is judged according to the output value of the filter for many times. A maximum deviation value is update in real time based on a trend of change. The clipping filtering method provided by the invention can be less dependent on the historical value, can basically have no data delay, and obviously suppresses the white noise and the Gaussian noise. On the other hand, it can reduce the demand of RAM and improve the real-time performance of filtering on the basis of guaranteeing the filtering effect.