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SHV resolution shown in comparison to other digital video formats.

Ultra High Definition (UHD), Ultra High Definition Video (UHDV), Ultra High Definition Television (UHDTV)[1], Extreme Definition Video and 8K is an experimental digital video format, currently proposed by NHK of Japan and British Sky Broadcasting. Ultra Definition Television (UDTV) is not UHDTV and represents an intermediate format also referred to as Quad TV and is mid-way between the HDTV and UHDTV.

Experimental technology

Super Hi-Vision's main specifications:

  • Resolution: 7,680 × 4,320 pixels (16:9) (approximately 33.2 megapixels)
  • Bits depth: 10-bit per channel
  • Colorimetry: Rec. 709
  • Frame rate: 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 - 8 MHz, 35~45Mbit/s bandwidth (RAI DVB-T2 tests)
    • Ku-band - 2x36MHz transponders, 140~150Mbit/s bandwidth (DVB-S2)
    • Ka-band - 600 MHz, 500~6600Mbit/s bandwidth
An SHV camera

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 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[2] to bring it to 7680 × 4320.[3]

Recently Aptina Imaging announced the introduction of a new CMOS Image sensor specifically designed for the NHK Super Hi-Vision project.[4]

The system was demonstrated at Expo 2006, Aichi, Japan, the NAB 2006 and NAB 2007 conferences, Las Vegas, and at IBC 2006 and IBC 2008 ,[5] 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.[6]

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 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.[7] Uncompressed, a 20 minute broadcast would require roughly 4TB 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 broadcast using a 500 MB using 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.

Three standards deal with Super Hi-vision:

  • ITU BT 1201
  • ITU 1769
  • SMPTE 2036

Sky 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.[8][9]

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 frames per second (60 or 50 Hz, whereas modern cinema films are usually 24 Hz).

See also

Notes and references

External links

Official sites





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