Analog VLSI and neural systems
Analog VLSI and neural systems
A review of median filter systems for analog signal processing
Analog Integrated Circuits and Signal Processing
Sorting continuous-time signals: analog median and median-typefilters
IEEE Transactions on Signal Processing
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Rank-based nonlinear filtering techniques are steadily gaining in popularity due to their robustness. However, the analog implementation of these techniques meets with considerable conceptual and practical difficulties. Here we describe an adaptive approximation for a rank filter of a continuous signal expressed in terms of a system of differential equations easily implementable in an analog circuit. The design is based on consideration of the finite precision of physical measurements, which leads to simple and efficient implementation of many traditionally digital analysis tools. We also illustrate the performance of the adaptive approximation filter in comparison with the respective 'exact' rank filter in a boxcar moving window.