James O'Neal /
01.23.2014 10:24 AM
NHK Broadcasts 8K Video Over the Air
8K UHD video received 27 km path in field test
TOKYO—Japan’s NHK says it has successfully transmitted 8K “Super Hi-Vision” television signals via a single standard UHF terrestrial broadcast channel over a distance of 27 km. The field test, conducted on Jan. 20 was performed as a follow-up to a May 2012 demonstration in which the UHD signal was sent slightly more than four km.

This most recent test was performed by NHK’s science and research laboratories and took place at that organization’s bureau located in Hitoyoshi, Kumamoto Prefecture in southern Japan.

Super Hi-Vision 8K video with its 7,680 x 4,320 pixel images provides about 16 times the resolution of conventional 1080-line high-definition television and generates a proportionally greater amount of data. Uncompressed, an 8K 60-field image produces a data rate of about 24 Gbps.

According to an NHK press release, this large amount of data was fitted into a “standard” six MHz broadcast channel via “image compression technologies” and was transmitted using “ultra-multilevel” orthogonal frequency division multiplexing and multiple-input multiple-output dual-polarization technologies.

The experiment was intended to demonstrate that Super Hi-Vision television could be satisfactorily delivered to the home over a signal path typically encountered in terrestrial broadcasting.


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1.
Posted by: Anonymous
Fri, 01-24-2014 04:24 PM Report Comment
Correction, sorry, the first version had a typo. One should correct typos, no? Proper spelling is basic. -mnh 1/24/14 8K, Ultra High Def, acceleration of video throughput, practical advances in video circulation: This article states that an uncompressed 8K 60 FPS video (16 times HD, 16 times 1920x1080p or 7680x4,320p), requires a data rate of 24 Gb/s. Today is the 30th Anniversary of the Apple Macintosh, 1/24/14, thirty years. Just think, the new Apple MacPro coming out next month, is capable of 20 Gb/s throughput, almost enough to drive uncompressed 8K, 60 FPS. It’s amazing how far Apple has come. Apple, now UHD capable, can surpass UHD with the new MacPro. 8K next. There's an air of video promise, higher video quality, improved video access, in the air, universally from Japan, Eutelsat, IBC, CES, InfoComm, Digital Signage Expo, MIPtv, more. Visual Ambrosia® makes available many Ultra High Def downloadable demo videos from Vimeo, useful for testing. Speaking of 8K, Visual Ambrosia® will upload its first 8K documentary art video on Vimeo, before 1/30/14, in time to enter the Webbys Online Video competition. Downloading UHD, then playing from the desktop or player, seems preferable to watching YouTube versions of UHD video: less vulnerable to excess file compression. less…
2.
Posted by: Anonymous
Sun, 01-26-2014 05:42 AM Report Comment
1/26/14 Anyone interested may find exemplary UHD decorative demo video reel, freely available, fully downloadable, on Vimeo. During this temporary UHD video program scarcity, as all await the UHD media dust to settle about formats and broadcast, thousands of UHD owners are downloading UHD video clips, full quality clips, from Vimeo. The UHD clips, once downloaded, are not subject to the compression artifacts many data sources and ISP providers must apply, to sustain smooth streaming. If you think that YouTube UHD videos are over compressed and degraded in display quality, compare the youTube version of the file to the same video downloaded from Vimeo, and gauge whether the videos look the same. Get back if you are interested in making a comparison between Google stream and download/play of the same video file from Vimeo. I can refer you to three examples of the same UHD video on Vimeo and YouTube,, but only streamable on YouTube.




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NAB Requests Expedited Review of Spectrum Auction Lawsuit
“Broadcasters assigned to new channels following the auction could be forced to accept reductions in their coverage area and population served, with no practical remedy.” ~NAB


 
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