DVB-S short form of Digital Video Broadcasting — Satellite
Major Specification of DVB-S
- DVB-S is basically used for SD signal not for HD.
- Technically DVB-S sends in MPEG2 compression algorithm.
- DVB-S is used in MCPC and SCPC modes for broadcast network feeds. MCPC is for multiple channels per carrier and SCPC is for Single channel per carrier.
- Roll-off factor: α = 0.35
DVB-S2 is the short form of Digital Video Broadcasting – Satellite – Second Generation
Major Specification of DVB-S2
- DVB-S2 is basically used both for SD and HD.
- DVB-S2 sends in MPEG4 which is a better compression algorithm (HD doesn’t implies MPEG4).
- DVB-S2 is used in both MCPC and SCPC modes for broadcast network feeds.
- Modulation schemes both QPSK and 8PSK.
- At the same satellite transponder bandwidth and emitted signal power, DVB-S2 performance gain over DVB-S is about 30%.
- Roll-off factor is both α = 0.20 and α = 0.25
DVB-T is the short form of Digital Video Broadcasting — Terrestrial
Major Specification of DVB-T
- 8K-mode or 2K-mode are two option for the number of carriers. These are actually 6,817 or 1,705 carriers that are approximately 1 kHz or 4 kHz apart.
- DVB-T offers total QPSK, 16QAM, 64QAM modulation schemes.
- DVB-T uses Coded Orthogonal Frequency Division Multiplexing (COFDM)