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  2. Culligan - Wikipedia

    en.wikipedia.org/wiki/Culligan

    Products. Water, water softener, water filters, bottled water, bottleless water coolers. Owner. BDT Capital Partners, LLC And 40% stake with Thomas Culligan Jr of Akron, Ohio. Number of employees. 14,000. Culligan International is a United States based global water treatment company with a network of dealers and direct operations in 90 ...

  3. Adaptive filter - Wikipedia

    en.wikipedia.org/wiki/Adaptive_filter

    Adaptive filter. An adaptive filter is a system with a linear filter that has a transfer function controlled by variable parameters and a means to adjust those parameters according to an optimization algorithm. Because of the complexity of the optimization algorithms, almost all adaptive filters are digital filters.

  4. Great Filter - Wikipedia

    en.wikipedia.org/wiki/Great_Filter

    Great Filter. The Great Filter is the idea that, in the development of life from the earliest stages of abiogenesis to reaching the highest levels of development on the Kardashev scale, there is a barrier to development that makes detectable extraterrestrial life exceedingly rare. [1] [2] The Great Filter is one possible resolution of the Fermi ...

  5. Particle filter - Wikipedia

    en.wikipedia.org/wiki/Particle_filter

    A particle filter's goal is to estimate the posterior density of state variables given observation variables. The particle filter is intended for use with a hidden Markov Model, in which the system includes both hidden and observable variables. The observable variables (observation process) are linked to the hidden variables (state-process) via ...

  6. Digital filter - Wikipedia

    en.wikipedia.org/wiki/Digital_filter

    Digital filter. A general finite impulse response filter with n stages, each with an independent delay, d, and amplification gain, a. In signal processing, a digital filter is a system that performs mathematical operations on a sampled, discrete-time signal to reduce or enhance certain aspects of that signal.

  7. Polarizing filter (photography) - Wikipedia

    en.wikipedia.org/wiki/Polarizing_filter...

    Polarizing filter (photography) Circular polarizer /linear analyzer [1] filtering unpolarized light and then circularly polarizing the result. A polarizing filter or polarising filter (see spelling differences) is a filter that is often placed in front of a camera lens in photography in order to darken skies, manage reflections, or suppress ...

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