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Filter

Filter may refer to:

In chemistry, engineering, or household usage, a device to separate mixtures. See:
- Filter (chemistry)
- Water filter
- Air filter
- Oil filter
- Pneumatic filter
- Filter (aquarium)

In optics and photography, a device to remove, or to enhance, certain ranges of wavelengths (colors) of light. See:
- Filter (optics)
- Photographic filter
- Infrared filter
- H-alpha|H-alpha filter
- Chelsea filter

In signal processing| signal-processing applications (such as electronics, music, and picture processing): a mathematical algorithm, or an electrical or mechanical device, used to remove part(s) of a signal. See:
- Electronic filter
- Audio filter
- Line filter
- Digital filter
- Wiener filter
- Kalman filter
- Low pass filter
- High pass filter
- Band pass filter

In computing:
- Filter (higher-order function)
- A program to process a data stream:
    - Filter (software)
    - Filter (Unix)
    - Mail filter
    - Internet filter
    - Wordfilter
    - DirectShow
- Berkeley Packet Filter|BPF filter expression used in the qualification of network data

- Category (Kant)| Category-based filtering of perception — according to (objectivist interpretations of) Kant

- In mathematics, a certain kind of subset of a partially ordered set. See
    - Filter (mathematics)
    - Filtering problem (stochastic processes)
- In psychology, a type of learning blockage. See
    - Affective filter
- In transportation. See
    - Filtering forward, a practice that cyclists use to pass slow or stopped congested traffic

- Filter (band), an industrial rock band
- Filter (television)|''Filter'' (TV series), a show on the G4 channel
- Filter (magazine)|''Filter'' (magazine), an off-beat indie music magazine
- Helicon Filter, a raster graphics editor

Sources: StartLearningNow, Wikipedia | Usage license: GNU FDL

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