Digital Signal Processing Reference
In-Depth Information
nel. In most cases there are about 4 - 6 frequencies in the air at any time.
Mecklenburg followed in autumn 2005, and Stuttgart in 2006. The net-
works implemented in Germany are all designed as small isolated SFN re-
gions with few transmitters.
In Italy, DVB-T was expanded greatly in 2004. MHP is not only "in the
air" but is also accepted there.
Switzerland followed in 2004/2005 and in Austria, DVB-T started in
2006.
In Greenland, for example, DVB-T is a very inexpensive alternative for
offering TV to the population in the small towns, each of which is an iso-
lated self-contained community. Satellite reception is very difficult in
Greenland because of its location and requires very large antennas, making
it a logical choice to rebroadcast the received channels inexpensively ter-
restrially by means of DVB-T, using transmitting powers of around
100 W.
DVB-T is also transmitted in Belgium and Holland and will be ex-
panded greatly in the next few years, especially in Holland.
In the US, Canada, Mexico and South Korea, ATSC is spreading, ac-
companied by some technical problems because of the single-carrier
method being used. ATSC will probably remain restricted to these coun-
tries
Japan has its own ISDB-T standard which has also been adopted by
Brazil.
Another area in which digital television has become established in the
meantime is on DVD and as a Mini-DV standard. Both methods have re-
sulted in a quantum leap improvement in the quality of reproduction com-
pared with VHS. More and more films are now also being sold on DVD in
parallel with VHS. DVD players now only cost about 100 Euros and every
new PC is equipped with one, in any case. And in the field of home video
cameras, Mini-DV cameras are now available for around 500 Euros and
produce top-quality pictures.
At the moment, field trials relating to DVB-H are being run in Europe.
It is still unclear how successful DVB-H will be and what will happen with
respect to the competing T-DMB system.
Europe is currently also in the initial stages of introducing HDTV (High
Definition Television). This is based on new technologies such as MPEG-4
AVC / H.264, and the new satellite standard DVB-S2.
There are other TV or mobile TV standards and extensions to standards
which should be mentioned but cannot be described in more detail because
of a lack of published information. These include MediaFLO and AVSB.
MediaFLO is another mobile TV standard by the Qualcomm company in
the US. There are few details of technical parameters which are known or
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