Information Technology Reference
In-Depth Information
4.2 Satellite Transmission
The AVC/H.264-based SHV codec system developed by NHK was introduced
and demonstrated at the NHK STRL open house in May 2007. The demonstration
showed that the codec system has the potential to encode the SHV signal at a bit-
rate of about 128 Mbps. In combination with satellite technologies, it will be pos-
sible to deliver the SHV programs to the home.
The effectiveness of the AVC/H.264 codec and the satellite technologies were
demonstrated at IBC 2008 in Amsterdam, where the SHV signals were delivered
from the uplink station in Turin, Italy over a Ku-band satellite capacity [13]. For
that first public demonstration of SHV transmission by satellite, DVB-S2 modula-
tion technology was indispensable. The SHV video and audio signals were en-
coded at about 140 Mbps, and the resultant stream was split into two 70-Mbps TS
streams, transmitted over two 36-MHz satellite transponders using 8PSK (8 Phase
Shift Keying) 5/6 modulation, and re-combined at the receiver using the synchro-
nization and de-jittering features of DVB-S2. A diagram of the transmission from
Turin to Amsterdam is shown in Figure 14. The difference of the delay between 2
received streams was 0.256 ms, and splitting of the streams did not affect the de-
coded signals. The setup and appearance of the transmission experiments are
shown in Figure 15.
Fig. 14 Satellite transmission diagram
Search WWH ::




Custom Search