Ampex created the first D-2 video machine, the ACR-225 commercial spot player working with Sony, who had done some early research into composite digital video, as a cost-effective solution for TV broadcasters with large investments in composite analog infrastructure such as video routers and switchers, since it could be inserted into existing analog broadcast facilities without extensive redesign or modifications. This was because D-2 machines accepted standard analog video and audio inputs and outputs. D-2 machines are capable of interfacing through either serial digital video or analog video connections. Four PCM audio channels are available for editing as well as an analog cue channel and timecode, also with digital or analog connections.
Features
Like D-1, D-2 uses 19 mm 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 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 approximatelythree minutes. The D-2 offered read before write or prereadfunctionality, 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.
Acceptance
During its early stages, finished episodes of South Park were hastily recorded to D-2 to be sent to Comedy Central for airing in just a few days' time. D-2 replaced Type C videotape for the mastering of LaserDiscs in the late 1980s. D-2 was in widespread use for some ten years, as the computer-based video server became available not long after its release. By 2003, only a handful of broadcasters continued to use the D-2 format, and even then only to access materials recorded on the format. Panasonic introduced D-3 in 1991; it is very similar to D-2 it uses a smaller cassette case.
