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ISDB-T
ISDB-T Technology overview
ISDB-TB is the Brazilian transmission standard for digital terrestrial broadcasting. The Japanese digital ISDB-T TV standard was modified and approved as ISDB-TB(integrated services digital broadcasting terrestrial Brazil). At the transmitter level, the changes made to the Japanese digital TV standard mostly relate to the transmission templates and broadcasting channels, and are customized for Brazil.
Unlike other digital transmission standards, ISDB-TB covers television, radio, and data services. Because all of these services can be transmitted independently of each other and in many different combinations, HDTV, SDTV, audio and text are all possible. At the same time, the data that is broadcast can contain the same programs at a lower quality and use less bandwidth for mobile terminal equipment.
Like in DVB-T, modulation is carried out using a "coded orthogonal frequency division multiplex" (COFDM) multicarrier method in 2k, 4k and 8k mode. The 6 MHz channel is split into 13 sub-bands (segments). These 13 segments in the OFDM spectrum can be combined to create segment groups, which are named "layers." These layers make hierarchical transmission possible with ISDB-TB.
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