
NHK puts to the test the land distribution to long distance signals 8K Los investigadores NHK han utilizado una Multiplexaci n por Divisi n de Frecuencias Ortogonale (OFDM).
El broadcaster p blico japon s NHK ha llevado con xito una serie de pruebas para la distribuci n de se ales digitales terrestres de im genes en formato Super Hi-Vision 8K. El env o a trav s de ondas de radio UHF permit difundir im genes en Ultra Alta Definici n desde las oficinas de Nippon Hoso Kyokai (NHK) Science & Technology Research Laboratories Hitoyoshi, Prefectura de Kumamoto, en el sur de Jap n, hasta una estaci n receptora a 27 kil metros utilizando un solo canal UHF.
En mayo de 2012, la NHK ya envi la primera se al del mundo en 8K a un punto de 4,2 kilometros de distancia.
Con una resoluci n de 7680 4320 p xeles (equivalente a una foto de 32 megap xeles) este formato de Ultra Alta Definici n es diecis is veces mayor que la HD est ndar y cuatro veces mayor que la de los televisores de 4K.
Las se ales Super Hi-Vision sin comprimir permiten su env o a 24 gigabits por segundo o incluso 48 gigabits por segundo a 120 fotogramas por segundo.Los investigadores NHK han utilizado una Multiplexaci n por Divisi n de Frecuencias Ortogonale (OFDM), un m todo de codificaci n de datos digital que se utiliza en Wi-Fi , as como m ltiples entradas y m ltiples salidas (MIMO), una t cnica en la que m ltiples antenas se utilizan en los puntos de transmisi n y recepci n para mejorar el rendimiento .
El broadcaster japon s inici la investigaci n en Super Hi-Vision en 1995 , y en 2012 , la NHK produjo seis canales de v deo en directo a resoluci n 8K durante los Juegos Ol mpicos de Londres para su difusi n en varios locales en Reino Unido, EE.UU. y Jap n.
Tras los Juegos de 2012 , la Uni n Internacional de Telecomunicaciones (UIT) aprob el 8K como un nuevo formato de televisi n de alta resoluci n. NHK ha demostrado desde entonces lap proyecci n de contenido 8K en diferentes ferias tecnol gicas y en festivales como Cannes y Tokio.
Por otro lado, la NHK planea emitir algunas competeiciones durante los Juegos Ol mpicos de Invierno en Sochi en 8K y mostrar el video en los lugares de proyecci n p blica en Jap n , incluyendo Tokio y Nagoya.
De cara al futuro, la NHK prev emitir algunas pruebas en Super Hi -Vision sobre sat lite durante los Juegos Ol mpicos de R o de Janeiro en 2016, plante ndose se adopci n como formato oficial en 2020, cuando Tokio sea sede de los Juegos Ol mpicos de verano.
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