Digital

NHK conducts longer-range 8K test

As part of its research towards making long-range terrestrial 8K broadcasting a reality, the Japanese public broadcaster recently sent an 8K signal over 27 kilometers in a test transmission.
February 3, 2014

Make way, 4K.

As part of its research and development of a large-capacity terrestrial transmission technology for 8K broadcasting, Japanese public broadcaster NHK has successfully completed a test transmission of an 8K signal across 27 kilometers.

The test consisted of a compressed 8K signal transmitted on a single UHF-band channel from a test station at NHK’s relay station in Hitoyoshi City, across the distance of 27 kilometers to a receiving station. That’s the same distance that can be achieved by current terrestrial digital broadcasting.

With the 8K signal having a resolution 16 times greater than the current HDTV signal, NHK used technologies that expand transmission capacity, including ultra-multilevel OFDM, a technology also used in WiFi to encode digital date on multiple carrier frequencies, as well as techniques to use multiple antennas at points of transmission and reception to enhance performance, and data compression technology.

In May of 2012 NHK made the world’s first terrestrial 8K test transmission, which covered a distance of 4.2 kilometers. This last test was conducted to demonstrate that 8K signals can be delivered to homes. The broadcaster, which calls its 8K technology Super Hi-Vision, says it is continuing to work with Japan’s ministry of internal affairs and communications to “strive for the speedy realization of 8K terrestrial broadcasting.”

About The Author
Andrew Tracy joined Realscreen as associate editor in 2021, following 17 years as managing editor of the award-winning international film magazine Cinema Scope. From 2010 to 2020 he also held the position of senior editor at the Toronto International Film Festival, where he oversaw the flagship publication for the organization’s year-round Cinematheque programming and edited its first original monograph in a decade, Steve Gravestock’s A History of Icelandic Film. He was a scriptwriter and consultant on the first season of the Vice TV series The Vice Guide to Film, and his writing and reporting have been featured in such outlets as Cinema Scope, Reverse Shot, Sight & Sound, Cineaste, Film Comment, MUBI Notebook, POV, and Montage.

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