Chemical Signaling Filtering
Filter (signal processing) In signal processing, a filter is a device or process that extracts some unwanted components or features from a signal. Filtering is a class of signal processing whose defining feature is the complete or partial suppression of some aspect of a signal. Most often it means certain frequencies or frequency ranges. However, filters do not operate in the frequency domain, especially in the field of image processing, there are many other purposes for filtering. Filters are widely used in electronics and telecommunications, radio, television, audio recording, radar, control systems, music synthesis, image processing, and computer graphics. There are many different bases for classifying filters, and these overlap in different ways; there is no simple hierarchical classification. Filters can be: non-linear or linear time variant or time invariant , also known as shift invariance. If the filter operates in the spatial domain, then the characteristic is spatial inv...