Ultra-high-definition television: Difference between revisions
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'''UHDTV's main tentative specifications:'''<ref>[http://www.nhk.or.jp/strl/open2011/tenji/04_e.html Open House 2011 Exhibition]</ref> |
'''UHDTV's main tentative specifications:'''<ref>[http://www.nhk.or.jp/strl/open2011/tenji/04_e.html Open House 2011 Exhibition]</ref> |
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* '''Number of pixels:''' 7,680 × 4,320 |
* '''Number of pixels:''' 7,680 × 4,320 (33.2 [[Pixel#Megapixel|megapixels]]) |
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* '''Aspect ratio:''' [[16:9]] |
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* '''Viewing distance:''' 0.75H |
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Revision as of 04:34, 1 May 2012
Ultra High Definition Television (or UHDTV, 4320p, and 8K) is a digital video format currently proposed by NHK Science & Technology Research Laboratories. It has a resolution about 16 times the number of pixels of existing HDTV, which brings it to roughly the detail level of IMAX.[1][2]
NHK advocates this video format as Super Hi-Vision.
Experimental technology
UHDTV's main tentative specifications:[3]
- Number of pixels: 7,680 × 4,320 (33.2 megapixels)
- Aspect ratio: 16:9
- Viewing distance: 0.75H
- Viewing angle: 100°
- Colorimetry: under discussion
- Frame rate: 120Hz progressive
- Bit depth: 12
- Audio system: 22.2ch
- Sampling rate: 48kHz, 96kHz
- Bit length: 16, 20, 24
- Pre-emphasis less
- Number of channels: 24
- Upper layer: 9ch
- Middle layer: 10ch
- Lower layer: 3ch
- LFE: 2ch
Since this format is highly experimental, NHK researchers had to build their own prototype from scratch. In the system demonstrated in September 2003, they used an array of 16 HDTV recorders to capture the 30-minute-long test footage.
The camera itself was built with four 2.5 inch (64 mm) CCDs, each with a resolution of only 3840 × 2048. Using two CCDs for green and one each for red and blue, they then used a spatial pixel offset method.[4] to bring it to 7680 × 4320.[5]
The system was demonstrated at Expo 2005, Aichi, Japan, the NAB 2006 and NAB 2007 conferences, Las Vegas, at IBC 2006 and IBC 2008,[6] Amsterdam, Netherlands, and CES 2009. A review of the NAB 2006 demo was published in a Broadcast Engineering e-newsletter.[7]
In November 2005, NHK demonstrated a live relay of a UHDTV program over a distance of 260 km by a fibre optic network. Using dense wavelength division multiplex (DWDM), 24 Gbit/s speed was achieved with a total of 16 different wavelength signals.
On December 31, 2006, NHK demonstrated a live relay of their annual Kōhaku Uta Gassen over IP from Tokyo to a 450 inch (11.4 m) screen in Osaka. Utilizing a codec developed by NHK, the video was compressed from 24 Gbit/s to 180–600 Mbit/s and the audio was compressed from 28 Mbit/s to 7–28 Mbit/s.[8] Uncompressed, a 20 minute broadcast would require roughly 4 TB of storage. In another indoor demonstration at the NHK Open House, the UHDTV signal was compressed to a 250 Mbit/s MPEG2 stream. This was later input to a 300 MHz wide band modulator and broadcast using a 500 MHz QPSK modulation. This "on the air" transmission had a very limited range (less than 2 metres), but shows the feasibility of a satellite transmission in the 36,000 km orbit.
In 2008, Aptina Imaging announced the introduction of a new CMOS Image sensor specifically designed for the NHK UHDTV project.[9] During IBC 2008 Japan's NHK, Italy's RAI, BSkyB, Sony, Samsung, Panasonic Corporation, Sharp Corporation, and Toshiba (with various partners) demonstrated the first ever public live transmission of UHDTV, from London to the conference site in Amsterdam.[10][11]
On September 29, 2010, the NHK partnered up and recorded The Charlatans live in the UK in the UHDTV format, before broadcasting over the internet to Japan.[12]
On May 19, 2011, SHARP demonstrated a direct-view 85" LCD display capable of 7680 x 4320 pixels at 10 bpp.[13]
The final goal is for UHDTV to be available in domestic homes, though the timeframe for this happening varies between 2015 to 2020 but Japan and China may get it in the 2013-2014 time frame.[14] BBC intends to trial UHDTV during the 2012 Summer Olympics, erecting 15 m display screens at three locations.[15]
Standards that deal with UHDTV include:
- Rec. ITU-R BT.1201-1 (2004)
- Rec. ITU-R BT.1706 (2006)
- SMPTE 2036-1 (2009)
- SMPTE 2036-2 (2008)
- SMPTE 2036-3 (2010)
-
Prototype Camera head (2006)
-
Prototype Camera head (2009)
See also
- 22.2 surround sound - the audio component of UHDTV
- IMAX - a digital theater format that historically has been innovative in creating a more realistic viewing experience
- High Efficiency Video Coding (HEVC)
Notes and references
- ^ Latest Research Activities of NHK Science and Technical Research Laboratories From Open House 2002
- ^ Progress on Large, Wide-screen Image Presentation NHK STRL, Broadcast Technology No.18, Spring 2004
- ^ Open House 2011 Exhibition
- ^ The resulting lines in the image alternate between pixels from the green-1 and red CCDs, and pixels from the blue and green-2 CCDs.
- ^ M. Kanazawa; et al. (2003). "Ultrahigh-Definition Video System with 4000 Scanning Lines" (PDF). NHK. Retrieved 2008-03-12.
{{cite journal}}: Cite journal requires|journal=(help); Explicit use of et al. in:|author=(help) - ^ Sangani, Kris (2008-10-11). "A game of leapfrog". Engineering & Technology. 3 (17): 8. doi:10.1049/et:20081720. ISSN 1750-9637. Retrieved 2008-10-31.
- ^ "Ultra HD draws crowds, interest at NAB2006". BroadcastEngineering HD Technology Update e-newsletter. 2006-05-02. Retrieved 2007-02-14.
- ^ "Super Hi-Vision live relay over IP". NHK. 2007-04-03. Retrieved 2008-01-15.
- ^ "Aptina Imaging introduces new high performance cmos sensor for high definition broadcasting video camera".
{{cite journal}}: Cite journal requires|journal=(help) - ^ "IBC Plans Two HD Firsts". AVS Forums. 2008-09-18. Retrieved 2008-10-03.
- ^ "Live super-HD TV to debut at IBC". Broadcast Now. 2008-05-27. Retrieved 2008-10-03.
- ^ "'Historic' broadcast of super HD from UK to Japan". BBC News. 2010-09-29.
- ^ http://www.engadget.com/2011/05/19/sharp-shows-off-the-worlds-first-super-hi-vision-lcd-with-16x-m/ SHARP and NHK SHV display demonstrations
- ^ http://www.satmagazine.com/cgi-bin/display_article.cgi?number=243539090
- ^ Sweney, Mark (2011-08-28). "BBC plans to use 3D and 'super hi-vision' for London Olympics". The Guardian. London.
External links
Official sites of NHK
- NHK Super Hi-Vision
- NHK Science & Technical Research Laboratories
- Annual report 2009 about NHK STRL, Super Hi-Vision research
Video
Articles
- What is Ultra HDTV?
- Ultra high resolution television (UHDV) prototype CD Freaks
- Just Like High-Definition TV, but With Higher Definition The New York Times
- Japan demonstrates next-gen TV broadcast Electronic Engineering Times
- Europe gets glimpse of HD future BBC News Online
- Researchers craft HDTV's successor PC World (magazine)
- Super Hi-Vision — research on a future ultra-HDTV system Masayuki Sugawara, EBU Technical Review
- Farewell to the Kingdom of Shadows A filmmaker's first impression of Super Hi-Vision television
