View source for Jog dial

{{short description|Type of knob, ring, wheel or dial used as a device control}}
{{More references|date=December 2009}}
[[File:Jog Dial 001.jpg|thumb|Jog Dial (at center of image) by [[Sony Ericsson]]]]
[[File:Sony BVE-600 UMatic edit controller (44714270850).jpg|thumb|[[Video editing|Edit controller]] for the analog professional video format [[U-Matic]]. With two jog dials for controlling one [[Video cassette recorder|VCR]] as source and one as a recorder, c. 1980s]]
[[File:Printemps_de_Bourges_2019-15,_contrôleur_DJ_(cropped)_-edit.jpg|thumb|upright=1.3|A [[DJ controller]] for controlling a DJ mixing software (e.g., a [[vinyl emulation]]) together with [[Digital audio|digital music files]] stored on a computer, with two jog dials each having about the size of a [[compact disc]]]]
A '''jog dial''', '''jog wheel''', '''shuttle dial''', or '''shuttle wheel''' is a type of knob, ring, wheel, or dial which allows the user to shuttle or jog through [[music|audio]] or [[video]] media.  It is commonly found on models of [[CD player]]s which are made for [[disc jockey]]s, and on professional video equipment such as [[video tape recorder]]s.  More recently, they are found on [[handheld]] [[Personal digital assistant|PDA]]s, and as the [[scroll wheel]] on [[Mouse (computing)|computer mice]].  "Jog" refers to going at a very slow speed, whereas "shuttle" refers to a very fast speed.
There are two basic types of wheels.  One type has no stops and can be spun the entire way around, because it is a rotary [[incremental encoder]].  This type depends on tracking the actual motion of the dial: the faster it spins forward or back, the faster it fast-forwards or rewinds.  Once the dial stops moving, the media continues playing or remains paused at that point.   Another type has stops on either side, and often has three or so speeds which depend on how far it is turned.  Once the wheel is released, it [[spring (device)|spring]]s back to the middle position and the media pauses or begins playing again.
[[File:Siri Remote second generation (cropped and turned).jpg|thumb|The [[remote control]] for the [[Apple TV]] (here 2nd gen.) has a jog dial function for scrolling through videos, as well as the competing [[Fire TV]].]]
If the device is set or designed to pause after the wheel is used, the audio is often [[stutter]]ed, repeating a small section over and over again.  This is usually done on DJ CD players, for the purpose of [[beatmatching]], and is equivalent to an earlier [[turntablist]] DJ moving a [[phonograph]] record back and forth slightly to find the physical location of a starting [[beat (music)|beat]] within the groove.  On the video, the pause is a freeze frame of the current [[video frame]].
[[Sony Corporation]] holds a patent<ref>{{cite web |last1=Rekimoto |first1=Junichi |title=Input apparatus, portable electronic device and input method for a portable electronic device |url=https://patents.google.com/patent/US20040164954A1/en |website=Google Patents |publisher=USPTO |access-date=18 January 2021 |ref=US20040164954A1}}</ref> for a 5-way version of the jog dial. A 5-way jog dial allows up and down scrolling, right and left deflections, and a press-to-click action. Such jog dial was a feature of the Sony [[CLIÉ]] [[Personal digital assistant|PDA]] series and [[Sony Ericsson P800]], [[Sony Ericsson P900|P900]] and [[P910]] smartphones. A 5-way jog dial has not been used by Sony or its subsidiaries since 2006.
==See also==
*[[iPod click wheel]]
*[[Dial box]]
==References==
{{Reflist}}
==External links==
*{{Commonscatinline}}
{{DEFAULTSORT:Jog Dial}}
[[Category:Audio engineering]]
[[Category:Television technology]]
[[Category:Computing input devices]]
[[Category:Input/output]]
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