Terns Of Visualization Part 03,
See also mixDissolve unit (ST) a device which instructs two or more projectors to dissolve from one slide to the next, either by a manual cue or from a tape-cue pulse.
Dobson (VT, film) usually, the final rehearsal of a shot before the camera begins to roll.
Dock (BT) the part of a theatre or event where tools and scenery can be offloaded and stored also known, more traditionally, as scene-dock.
Docudrama (VT, film) sees dramadoc
Documentary (ST, VT, film) is a straightforward factual over in the un-fussy way of a news transmit or television documentary.
Dolby (sound) a trade name for a system which, on the master tape, decreases all the unwanted spare noise you get from sound recording tools.
Dolly (VT, film)
(1) A wheeled mounting of any type on which a camera can be mounted.
(2) To dolly means to be in motion the camera around on its dolly.
Domino (BT) a lighting source that lights up the cyclorama and back part of the stage.
Dope sheets (VT, film) see camera script
Double exposure (film, ST) the acts of exposing one frame of movie twice so that you get a mixture of two pictures on one slide. This is done at photographic stage.
Double head (film) the way in which a movie can be sights with its accompanying soundtrack during the editing process. Vision is on one piece of movie, sound on another, and the two are projected together – hence the term.
Double track (sound) a method whereby one singer (or musician) can get two sounds, almost for the price of one. However cynics say that dual tracking is a useful machine to cover up a less than amazing voice quality. The singer (and it is more usually a singer, although the method can in theory be used for any solo sound) sings his or her part, which is recorded. It is then played back to the singer through the cans as a guide track, and he or she sings along with it. The next voice track is then mixed in with the first. As there will be an inevitable fractional delay between the first and second voices, you get a fuller, 
more interesting, double-track effect.
Downstages (BT) see stage directions
Dramadoc (VT, film, ST) also known as a docudrama. In effect the halfway house between a documentary and a dramatization. It is the re-enactment, by performer or models, of an actual occasion which has occurred in actual life. The term can also be used to describe faction.
Dramatization (ST, VT, and film) is the enacting if a fictitious story or message, using performers or models. In this business, a typical dramatization might occur in a safety training movie, where actors represent what can happen in an office or factory if fire breaks out; or in sales training, where actors demonstrate the ‘right’ and ‘wrong’ selling method to a consumer.
Drapes (BT, VT) are all soft cloth, hanging or else, that are used on stage or in a studio.
