Super Hi-Vision
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Super Hi-Vision (SHV), also known as , Ultra High Definition Video, UHDV, Extreme Definition Video, Ultra High Definition Television[1], UHDTV , UHD and 8K is an experimental digital video format, currently proposed by NHK of Japan, the BBC, and RAI.
Super Hi-Vision's main specifications:
- Resolution: 7,680 × 4,320 pixels (16:9) (approximately 33 megapixels)
- Bits depth: 10-bit per channel
- Colorimetry: Rec. 709
- Frame rate: 50 and 60 frame/s. (progressive)
- Audio: 22.2 channels
- 9 — above ear level (top layer)
- 10 — ear level (middle layer)
- 3 — below ear level (bottom layer)
- 2 — low frequency effects
- Bandwidth:
- UHF - 8MHz, 35~45Mbit/s bandwidth (RAI DVB-T2 tests)
- Ku-band - 2x36MHz transponders, 140~150Mbit/s bandwidth (DVB-S2)
- Ka-band - 600MHz, 500~6600Mbit/s bandwidth
The new format with a resolution of 7680 × 4320 pixels is four times as wide and four times as high (for a total of 16 times the pixel resolution) as existing HDTV, which has a maximum resolution of 1920 × 1080 pixels. According to the Yomiuri Shimbun, the Japanese Ministry of Internal Affairs and Communications will be starting a public-private partnership to develop technology for SHV in the hopes of setting an international standard for Super Hi-Vision in addition to broadcasting with it beginning in 2015.[2]
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[edit] Experimental technology
Because 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 18-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[3] to bring it to 7680 × 4320.[4]
Recently Aptina Imaging announced the introduction of a new CMOS Image sensor specifically designed for NHK Super Hi-Vision project.[5]
The system was demonstrated at Expo 2005, Aichi, Japan, the NAB 2006 and NAB 2007 conferences, Las Vegas, and at IBC 2006 and IBC 2008 ,[6] Amsterdam, Netherlands and also showing in Consumer Electronics Show 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 Super Hi-Vision program over a distance of 260 km by a fiber optic network. Using dense wavelength division multiplex (DWDM), 24 gigabit 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 28Tb of storage.
In another indoor demonstration at the NHK open house, the Super Hi-Vision signal was compressed to a 250 Mbit MPEG2 stream. This was later input to a 300 MHz wide band modulator and broadcasted using a 500 mb using QPSK modulation. This "on the air" transmission had a very limited range (less than 2 metres), but show the feasibility of a satellite transmission in the 36,000 km orbit.
Three standards deal with Super Hi-vision:
- ITU BT 1201
- ITU 1769
- SMPTE 2036
The BBC also appears to be interested in the technology. During IBC 2008 Japan's NHK, Italy's RAI and the BBC (with various partners) demonstrated the first ever public live transmission of Super Hi-Vision, from London to the conference site in Amsterdam.[9][10]
In addition it was demonstrated at the BBC's Media Centre in West London in early October, 2008.
The BBC has been looking into the use of its Dirac codec with Super Hi-Vision.
Although Super Hi-Vision has increased resolution compared with existing HD standards, it uses the same number of pictures per second i.e 50 and 60. This may be a problem for anything other than carefully chosen test material.
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