What is dvb-t

DVB T:Digital Video Broadcasting Terrestrial

DVB-T is a standard for MPEG-2 digital TV transmission using an open-circuit terrestrial transmission medium. Due to the special environment of terrestrial TV transmission, after years of research and demonstration, experts participating in the DVB organization selected COFDM code division orthogonal frequency division multiplexing The channel modulation technology used, accompanied by a powerful error correction code, achieves a balance between spectrum utilization efficiency and transmission reliability. COFDM signal modulation and coding technology provides 2 sub-carrier numbers, 2K and 8K modes, 3 modulation methods, 4 maintaining intervals, and supports small and large-scale single frequency networks to run SFN. The same digital TV program can be sent through multiple sources. Receive the same frequency of the receiver at the same time to improve the reception effect. The system can support the 8MHZ bandwidth of the current analog TV system, as well as 7MHZ and 6MHZ bandwidths. In order to prevent reflection interference and receive signals from multiple transmitters of the same frequency, the concept of guard interval is introduced: in order to adapt to transmission in different environments, the system supports hierarchical modulation.

DVB-T, it is aimed at terrestrial broadcasting. Let's talk about its related technology in more detail:

FDM: frequency division multi
OFDM: Orthogonal Frequency Division Multiplexing
COFDM: Coded orthogonal frequency division multiplexing, inverse fast Fourier transform (IFFT). Good anti-multipath propagation effect and co-frequency interference, suitable for terrestrial broadcasting and co-frequency network broadcasting.
QAM: Quadrature Amplitude Modulation: Quadrature amplitude modulation, high modulation efficiency, requires high signal-to-noise ratio of the transmission path, suitable for cable television transmission.
QPSK: Quadrature (Quaternary) Phase Shift Keying keying phase shift modulation, high modulation efficiency, requires low signal-to-noise ratio of the transmission path, suitable for satellite broadcasting.
VSB: Vestigial sideband vestigial sideband.

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