Start code for signalling bits

H - Electricity – 04 – N

Patent

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Details

H04N 21/43 (2011.01) H04N 21/6336 (2011.01) H04N 7/035 (2006.01) H04N 7/084 (2006.01) H04N 7/088 (2006.01) H04N 7/00 (2006.01) H04N 5/44 (2006.01) H04N 5/445 (2006.01)

Patent

CA 2140771

In an extended television signal comprising signalling bits for conveying control information to control an extended decoder, the signalling bits comprise a start code and data bits, the start code's main lobe of spectral energy resides in the lower spectral area of a baseband television signal below 2 MHz and preferably below 1.7 MHz, the start code is preferably (almost) DC-free, and the start code has good aperiodic correlation properties and a predetermined minimum bit Hamming distance to the data bits when shifted in the direction of the data bits following the start code.

Dans un signal de télévision haute définition comportant des bits de signalisation pour transmettre les informations de commande d'un décodeur haute définition, les bits de signalisation comprennent un code de déclenchement et des bits d'information. Le lobe central d'énergie spectrale du code de déclenchement se situe dans la zone spectrale inférieure d'un signal de télévision à bande de base de moins de 2 MHz et de préférence de moins de 1,7 MHz. Le code de déclenchement, de préférence (presque) exempt de CC, présente de bonnes propriétés de corrélation apériodique et se trouve séparé des bits d'information par une distance de Hamming (d'un nombre minimal de bits) prédéterminée, lorsqu'il est décalé en direction des bits d'information qui le suivent.

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