30 Jul '14, 4pm

Japanese Broadcaster Uses LEDs for Underwater TV Transmission

Japan’s public broadcaster Nippon Hoso Kyokai (NHK) wants to broadcast live TV from under the water, but it’s been tripped up by that pesky cable that transfers the camera’s data to the surface. So engineers there are developing an underwater wireless transmission system that uses visible light from LEDs as the method of transmission. Their goal is to enable wireless live underwater TV broadcasting. The system employs the Internet Protocol and uses a new scheme to control video transmission rates and error correction specially suited for the underwater environment. Uncompressed video from an underwater camera is fed by cable to a waterproof casket containing the transmission equipment. An encoder compresses and encodes the video into IP packets, which, together with error correction data, are sent to an electrical to optical converter. The converter drives an LED module of...

Full article: http://spectrum.ieee.org/tech-talk/consumer-electronics/a...

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