The DVB-T Standard is published as EN 300 744, Framing structure, channel coding and modulation for digital terrestrial television. These are actually 1,705 or 6,817 sub-carriers that are approximately 4 kHz or 1 kHz apart.ĭVB-T offers three different modulation schemes ( QPSK, 16QAM, 64QAM).ĭVB-T has been adopted or proposed for digital television broadcasting by many countries ( see map), using mainly VHF 7 MHz and UHF 8 MHz channels whereas Taiwan, Colombia, Panama and Trinidad and Tobago use 6 MHz channels. In the case of DVB-T, there are two choices for the number of carriers known as 2K-mode or 8K-mode. Rather than carrying one data carrier on a single radio frequency (RF) channel, COFDM works by splitting the digital data stream into a large number of slower digital streams, each of which digitally modulates a set of closely spaced adjacent sub-carrier frequencies. It is also used in the US by Amateur television operators. It is also the format widely used worldwide (including North America) for Electronic News Gathering for transmission of video and audio from a mobile newsgathering vehicle to a central receive point. This system transmits compressed digital audio, digital video and other data in an MPEG transport stream, using coded orthogonal frequency-division multiplexing (COFDM or OFDM) modulation. List of digital television broadcast standardsĭVB-T, short for Digital Video Broadcasting – Terrestrial, is the DVB European-based consortium standard for the broadcast transmission of digital terrestrial television that was first published in 1997 and first broadcast in Singapore in February, 1998.
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