Analog median filtering
Paul, S.; Huper, K.; Nossek, J.A.
Acoustics, Speech, and Signal Processing, 1992. ICASSP-92., 1992 IEEE International Conference on
Volume 3, Issue , 23-26 Mar 1992 Page(s):557 - 560 vol.3
Digital Object Identifier   10.1109/ICASSP.1992.226152
Summary:The basic nonlinear operation in median filtering is a sorting of the input data vector. An analog structure for this filtering operation is presented. The sorting operation is embedded in a matrix-valued ordinary differential equation (ODE). The data to be sorted serve as initial values for the ODE. To induce the dynamics of the system a small perturbation is necessary. The circuit structure for the analog median filter consists of basic processing cells containing multipliers, integrators, and adders, arranged in an one-dimensional array. All connections are local only and no external control is necessary

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