![]() ![]() And with 4:2:0, 75% of color information is discarded. With 4:2:2, half of the color detail is thrown away. There are three main types of chroma subsampling for video content: 4:4:4 4:2:2 and 4:2:0. The result is a reduction of image data with no accompanying visual degradation. Chroma subsampling compression takes advantage of this fact by sending a full-resolution black and white (luma) information and only partial-resolution color (chroma) information. The human eye is more sensitive to black and white detail than color detail. The key to making it fit is a color compression technique called chroma subsampling. For example, sending a UHD image at 60 fps with full 36-bit color depth, 32 channels of audio and no compression requires 17.99 Gb/sec of bandwidth. It’s possible that some displays may work at the higher bit-depths, but they aren’t required to. While our math shows that HDMI 2.0 has the bandwidth to support them, we’ve been told that they are not officially covered by the HDMI 2.0 specification. 2020 allows for 30 bits or even 36 bits.ĭoes HDMI 2.0 fully support these higher bit-depths? From what our industry sources have told us, the answer is no. Current HD video is 24 bits per-pixel, while Rec. 2020 has over the current HDTV standard is that it allows for increased image bit-depths, which produces pictures with smoother gradients and less banding artifacts. As for broadcast or cable UHD TV, no standards exist yet. ![]() 2020 is a list of technical “recommendations” for UHD put forth by the International Telecommunications Union, an agency of the United Nations. Concerts, sports, 3D films-any content shot with a 60 fps rate can now be sent over HDMI at full UHD resolution.īest Selling Soundbars and 5.1 Surround Systemsīest Selling Blu-ray Players HDMI 2.0 and Rec. With its 14.4 Gb/sec limit, HDMI 2.0 can handle that quite easily. Using the same color depth as HDTV, we only need 6.05 Gb/sec of bandwidth to support that resolution and frame rate with audio. Sending a UHD image over HDMI 2.0 at 60 frames-per-second (fps) is easy. (This 20% overhead exists in all HDMI versions.) The rest is overhead used for error correction and to make the signal more robust over long distances. ![]() How does HDMI 2.0’s extra bandwidth improve UHD support? Of that 18 Gb/sec bandwidth, only 14.4 Gb/sec is usable. However, all of these features are less important than the impact on UHD-resolution content. It also adds other features for future compatibility, including an increase to 32 audio channels over HDMI 1.4’s eight channels, higher audio sample rates and 21:9 aspect ratio support. Higher bandwidth means higher resolutions and a higher frame rate capability. The most important change that HDMI 2.0 brings to the table is an increase in bandwidth from HDMI 1.4’s 10.2 Gigabits per second (Gb/sec) rate to18 Gb/sec. (The group so far has not released many details about HDMI 2.0 to the press.) Even so, I have gone ahead and made an effort to answer those questions on my own based on industry sources, published works, and some number-crunching. I posed a number of in-depth technical questions concerning 2.0 to the HDMI group, but it refused to answer any of them. Version 2.0 adds much better support for 3840×2160-resolution Ultra HD (UHD and also called 4K) sources going forward. The recent IFA Trade Show saw the introduction of HDMI 2.0, the newest version of the HDMI standard. ![]()
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