Definição do conceito
[POR] D-2 (video) |
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[ENG] D-2 | D-2 (video) | D-2 is a professional digital videocassette format created by Ampex and introduced in 1988 at the NAB Show as a composite video alternative to the component video D-1 format. It garnered Ampex a technical Emmy in 1989. Like D-1, D-2 stores uncompressed digital video on a tape cassette; however, it stores a composite video signal, rather than component video as with D-1. While component video is superior for advanced editing, especially when chroma key effects are used, composite video was more compatible with most analog facilities existing at the time.| FEATURES | Like D-1, D-2 uses 19 mm (¾ inch) tape loaded into three different sized videocassettes to support commercial spot playback as well as long-form programming such as movies. Although D-2 videocassette housings are nearly identical to their D-1 counterparts, they are not interchangeable due to D-2´s metal particle tape formula, needed for its higher recording density. | Ampex D-2 tape transports are extremely fast. A high speed search at 60 times playback speed with a recognizable color picture allowed three hours of videotape to be searched through in approximately three minutes. | The D-2 offered read before write or preread functionality, which allowed simultaneous playback and recording on the same transport. For example, a title could be superimposed over existing video already on the same video tape by playing the tape through a video switcher, adding the title, and recording the new composite image back onto the same location of the tape. This eliminated the need for an additional recorder and saved considerable time in video editing. Steven Fuiten was the first PreRead Editor to composite video using a full D2 digital system. | SOURCE : D-2 (video) in: Wikipedia. Available at : https://en.wikipedia.org/wiki/D-2_(video) Accessed : 25 nov. 2022
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[ENG] D-2 | D-2 | Dates : 1988 – 2000s | Common Size(s) : Tape width: ¾" | Cassette, small: 6¾" × 4¼" × 1?" / cassette, medium: 10" × 5?" × 1?" | Description : D-2 is a magnetic tape-based digital video cassette format. The tape is composed of magnetic particles, a binder, and a polyester base. Medium cassettes are 10" × 5?" × 1?" and small cassettes are 6¾" × 4¼" × 1?" with a tape width of ¾". The cassettes are usually gray with tape identification in the upper right-hand corner. | Composition : Polyester magnetic tape enclosed in a plastic cassette | SOURCE : PSAP - Preservation Self-Assessment Program. Collection. University of Illinois at Urbana-Champaign. Available at : https://psap.library.illinois.edu/collection-id-guide/videotape#d3 Accessed : 25 nov. 2022
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