1.
INTRODUCTION:
Digital audio broadcasting, DAB, is the most fundamental advancement in radio technology since that introduction of FM stereo radio. It gives listeners
interference — free reception
of CD quality sound, easy to use radios, and the potential for wider listening
choice
through
many
additional
stations
and services.
DAB is a reliable multi service digital
broadcasting system for reception
by mobile, portable
and fixed receivers
with a simple, non-directional antenna.
It can be operated at any
frequency
from
30
MHz
to
3GHz
for
mobile reception
(higher for fixed reception)
and may be used on terrestrial, satellite,
hybrid (satellite with complementary terrestrial) and cable broadcast networks.
DAB system
is a rugged, high spectrum
and power efficient sound and data
broadcasting system.
It
uses
advanced digital
audio
compression techniques (MPEG 1 Audio layer II and MPEG 2 Audio Layer II) to achieve a spectrum
efficiency equivalent to or higher than that of conventional FM radio. The efficiency of use of spectrum is increased by
a special feature called Single. Frequency Network (SFN).
A
broadcast
network
can be extended virtually without limit a operating
all transmitters on the same radio frequency
2. APPLICATION:
Mono
talk radio, news and weather channels and other non-music programs need
significantly less bandwidth than a typical music radio station, which allows
DAB to carry these programmes at lower bit rates, leaving more bandwidth to be
used for other programs. DAB radios automatically tune to all the available
stations, offering a list for the user to select from.
DAB can carry
"radiotext" (in DAB terminology, Dynamic Label Segment, or DLS) from
the station giving real-time information such as song titles, music type and
news or traffic updates. Advance programme guides can also be transmitted. A
similar feature also exists on FM in the form of the RDS.
(However, not all FM receivers allow radio stations to be stored by name.)
DAB receivers can display time of day as encoded into transmissions, so is
automatically corrected when travelling between time zones and when changing to
or from Daylight
Saving. This is not implemented on all receivers, and some display time
only when in "Standby" mode.
Some radios offer a pause
facility on live broadcasts, caching the broadcast stream on local flash memory,
although this function is limited.
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