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Hans Hoffmann, Senior Manager and Head of Media Fundaments and Production Unit at the EBU (European Broadcasting Union) ...
When talking about the current crop of 4K TVs, Hans called them "Quad HD," since they have exactly four times the number of pixels as so-called Full HD but no other enhancements beyond HDTV. This is also referred to by the EBU as "UHD Phase 1" or "UHD-1," which retains all other aspects of current HDTV, such as BT.709 (often called Rec.709) colorimetry, dynamic range, and frame rates.
The next stop on the UHD roadmap is UHD-2, which is expected to be implemented in 2016 to 2018 and should include BT.2020 colorimetry, frame rates up to 120 fps, bit depth up to 12 bits for high dynamic range, and immersive audio of some sort. Finally, UHD-3 retains the characteristics of UHD-2 but with a pixel resolution of 7680x4320 (so-called "8K"); this is being promoted mostly by Japan and is expected to emerge sometime between 2020 and 2025.
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