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• #39 headhunter addikt

  Új Válasz 2015-01-07 20:29:46 #39

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  8K UHDTV: How do you send a 48Gbps TV signal over terrestrial airwaves?...

  "Starting in 2003, NHK effectively strapped 16 HDTV cameras together to create a single 30-minute UHD clip. In 2005, a UHD TV program was transmitted over a 240km (160 miles) fiber optic network — and in 2010, NHK managed to transmit UHD from the UK to Japan, over the internet. Earlier in 2012, following various tech advances, NHK finally demonstrated the first shoulder-mounted UHDTV video camera — and now, the Japanese broadcaster has successfully transmitted UHDTV 4.2km (2.6 miles) over conventional, UHF airwaves.
  Prototype NHK 8K camera

  This is no mean feat: At 120 frames per second (UHD allows for 24, 25, 50, 60, and 120 fps), a raw 7680×4320 video feed clocks in at 48 gigabits per second (Gbps). The Super Hi-Vision spec (SMPTE 2036) supports 22.2-channel sound, too, which comes in at around 50Mbps. After compression (NHK has developed a special codec for Super Hi-Vision), the entire stream clocks in at around 500Mbps. To put this into perspective, a 1080p TV channel signal (over the air) is around 10Mbps. The new 802.11ac WiFi standard can reach similar speeds (500Mbps), but over tens of meters — not 4.2km."

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