A phaser is an electronic audio signal processor used to distort a signal by mixing a "dry", or unprocessed, signal with a copy of itself that has been filtered through an all-pass phase-shift network. As the filtered signal is mixed with the dry signal, the effect is that of a comb filter, notching out and reinforcing frequencies at fixed intervals up the frequency spectrum. When the all-pass filtered signal alone is heard at the output, the effect is commonly referred to as vibrato. In motion picture or television production, the effect is often used to imply that a sound originates from an artifical source (e.g. a computer or robot voice.) Audio signal processing, sometimes referred to as audio processing, is the processing of a representation of auditory signals, or sound. ... The term filter may refer to: Filter (chemistry) — a device to separate mixtures, e. ... In signal processing, a comb filter adds a slightly delayed version of a signal to itself, causing phase cancellations and a spectrum that looks like a comb. ... Sine waves of various frequencies; the lower waves have higher frequencies than those above. ... The noun spectrum (plural: spectra) has a variety of meanings. ... Vibrato is a musical effect where the pitch or frequency of a note or sound is quickly and repeatedly raised and lowered over a small distance for the duration of that note or sound. ... For other uses see film (disambiguation) Film refers to the celluliod media on which movies are printed Film — also called movies, the cinema, the silver screen, moving pictures, photoplays, picture shows, flicks, or motion pictures, — is a field that encompasses motion pictures as an art form or as part of...