A variable speed pitch control (or vari-speed) is a control on an audio device such as a turntable, reel-to-reel, tape deck or CD player that allows the operator to deviate from a standard speed (such as 33⅓, 45 or even 78 rpm on a turntable). The phonograph, or gramophone, was the most common device for playing recorded Sound from the 1870s through the 1980s Reel-to-reel, open reel tape recording is the form of magnetic tape audio recording in which the recording medium is held on a Reel, rather than being This article deals mainly with analog tape recorders for audio applications information on digital recording, recording of video signals, and A Compact Disc player (often written as compact disc player) or CD player, is an electronic device which plays audio Compact Discs CD players are often The latter term "vari-speed" is more commonly used for tape decks, particularly in the UK. The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom, the UK or Britain,is a Sovereign state located Analog pitch controls vary the voltage being used by the playback device; digital controls use digital signal processing to change the playback speed or pitch. Digital signal processing ( DSP) is concerned with the representation of the signals by a sequence of numbers or symbols and the processing of these signals A typical DJ deck allows the pitch to be increased or reduced by up to 8%, which is achieved by increasing or reducing the speed at which the platter rotates.
Turntable or CD playing speed may be changed for beatmatching and other DJ techniques, while pitch shift using a pitch control has myriad uses in sound recording. Beatmatching is a Disc jockey technique of Pitch shifting or Timestretching a track to match its Tempo to that of the currently playing track A disc jockey (also known as DJ or deejay) is a person who selects and plays recorded music for an audience Pitch shift is a Sound recording technique in which the normal pitch or tone of a sound is altered ("shifted" for effect or for other purposes