Filtering modifies the frequency spectrum of a signal.

Filters reduce or boost the volume of a signal at a particular frequency or band of frequencies. The various functional types of filter are named according to their effect :

  • Low Pass : cuts frequencies above a certain frequency
  • High Pass : cuts frequencies below a certain frequency
  • Band Pass : cuts frequencies outside a certain band
  • Peaking : boosts frequencies within a certain range.
  • Notch : cuts completely frequencies a certain value.
  • Shelving : cuts or boosts below or above a certain value.


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