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The DAB family is characterized by a common transmission system, robust for mobile applications and with a capacity for transporting many programmes. This multiplex approach, with a "bouquet" or "package" of programmes, is specially suitable for public broadcasters and private radio groups, allowing them to simultaneously broadcast all their programmes within a single network. |
Different services
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On top of the DAB transmission system, different types of service can be transported:
DAB using MPEG-2 Layer II audio. It is generally possible to transport 6-9 programmes in a multiplex, but this will vary depending on the audio quality and multimedia features deployed.
DAB+ using MPEG-4 HE-AACv2 audio. It is generally possible to transport 12-18 programmes in a multiplex, but again this will vary depending on the audio quality objectives and multimedia features.
T-DMB for mobile television or picture radio using MPEG-4 H.264 video and MPEG-4 HE-AACv2 audio. For mobile television, 2-3 programmes are generally transported per multiplex. For radio, the number of radio programmes is very similar to that achieved with DAB. |
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Co-existence
It is important to understand that DAB, DAB+ and T-DMB can co-exist in a DAB multiplex. Moreover the choice for one of these systems doesn't impact the network design, which is the same for all DAB based systems.
Regarding multimedia features, several possibilities exist such as Slideshow, rich media with MPEG BIFS, enhanced text services with Intellitext or Journaline, Electronic Programme Guides, etc.
The DAB transmission system is a good candidate platform in Europe for the transport of TPEG services for road traffic and travel information.
