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How does this work? Is it digital sampling of the monochrome picture and the PAL/NTSC/whatever colour subcarrier? -- Zilog Jones ( talk) 22:11, 30 May 2009 (UTC)
coming to this late.... first, bringing VHS into the story as an example of composite video is very misleading; VHS & several other cassette-based videotape formats use colour-under recording, which separates & transposes the colour subcarrier, as distinct from sampling & recording it directly as D2 did....
.... but the article has bigger issues than that- it doesn't explain properly why the recording of composite video was a good solution, or a technical priority for ampex, as distinct from decoding the input to components (Y, R-Y, B-Y like betacam, or D1) & then re-encoding them to composite (NTSC or PAL) at the output. yes, the format was initially developed to replace spot-players based on 2" quad (ampex' own ACR-25, for example), but there was already sony's betacart filling this role, along with cart machines from other manufacturers, & based on component formats. so why did ampex push ahead with a digital composite format? there was a demand for 'digital quality' before the technology was mature enough to record component signals onto small-format stock, i.e. 1/2" cassettes with (initially) a suitable housing for a robotic cart machine like sony's betacart & LMS, or ampex' own ACR technology. later, the larger cassettes & studio/edit recorders were available too, but the cart version came first. there was pressure from ad agencies, via the broadcasters, for a less costly & labour-intensive spot player than the aging ACR-25. the betacart was in its early (pre-SP) variant, & picture quality wasn't what we saw from beta-SP & digibeta a few years later. beta tapes also degraded rapidly, & in the context of tv commercials this is a bad thing. sony field engineers recommended that the life of a beta cassette was around 400-500 airings. the evaporated-metal stock used in D2 was a lot more robust. anecdotally, then, ampex produced the format to address this issue ahead of the development of component digital formats, such as panasonic's D3, sony's digibeta & so on. ampex may have had plans to develop their own small-format digital compnent format but were likely deterred by the rapid uptake of D3 & then digibeta; they had lost ground by this time, & got into badge-engineering the sony machines.
again, I wish I could cite something to support all this recollection, & then improve the article. I'll see what I can dredge up.
duncanrmi ( talk) 16:19, 17 July 2019 (UTC)
XyKyWyKy aka raffriff42 ( talk) 08:03, 16 September 2013 (UTC)
The article is inconsistent as to whether there is a hyphen. Incoming links are also inconsistent. Similar issue for [[D-1 (Sony}]]. Anyone know what's right? ~ Kvng ( talk) 01:16, 16 July 2018 (UTC)