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Media Streaming for T-DMB |
Professional hardware and software solution for T-DMB media
broadcasting
Product Features:
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Audio/Video grabbing (digital SDI, analog and file input), |
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Real-time encoding of video (H.264/AVC) and audio
(HE-AAC v1 + v2), |
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MPEG-2 transport stream (TS) multiplexing according to
T-DMB specification, |
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T-DMB compliant TS over UDP/IP, ASI and as file output, |
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Simple Network Management Protocol (SNMP) support, |
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Cross platform solution (Windows and Linux) |
Background Information
Terrestrial Digital Multimedia Broadcasting (T-DMB) is taking
advantage from the existing DAB broadcasting infrastructure. This
greatly supports the introduction of the new TV-like services for
mobile devices such as PDAs or mobile phones. In many countries
T-DMB is very close to its introduction on the market. FhG-HHI
offers a variety of commercial software products in the field of
mobile broadcasting among which is the T-DMB media server that is
used in various field-trials throughout the world. The media server
impresses with its outstanding image quality even at low bit rates.
T-DMB Media Server
The T-DMB media server software is available on Windows/Linux
based PC platforms. PCs equipped with professional A/V grabber cards
(e.g. DVS, Osprey 530/540/560) offer flexible and high quality
audiovisual input that matches the requirements of broadcast playout
centers. The processing chain of the T-DMB compliant media server
includes the functionality of analog or digital A/V signal grabbing
(all T-DMB image and audio formats), A/V encoding (LC-AAC, HE-AAC
v1+v2, H.264 video) and MPEG-2 transport stream multiplexing
according to the T-DMB specification which includes the MPEG-4
synchronization layer (SL) prior to PES/TS packetization. File input
and output is an additional feature of the MediaServer. An SNMP
agent is provided with the software that allows remote configuration
and monitoring of the media server operation.
System Overview
A complete T-DMB processing chain including the media server (P1)
the R&S DSIP020 (P2) and a DAB Sender (P3) is shown in Figure 1.
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| Fig.1: |
DMB processing chain |
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The T-DMB media server performs the previously
described processing steps up to the generation of the constant
bitrate transport stream that is packetized in UDP/IP packets. The
TS is delivered over Ethernet to some gateway (R&S DSIP020 in the
diagram above). Unit P2 extends the TS packets to 204 byte by adding
16 Reed Solomon FEC bytes to each packet and performs interleaving
and ETI multiplex. The ETI (NI, G.703) output can be directly
connected to a DAB transmission unit (P3) or alternatively be
attached to some Ensemble Multiplexer prior to feeding the signal
into the DAB transmitter.
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| Fig.2: |
Mobile TV, IBC 2006,
Amsterdam, NL |
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more Information:
Visual Radio provides radio service with assisting visual
information. Still images are transferred within the MPEG-4 video
stream at a configurable refresh rate typically every two seconds.
The MPEG-4 audio stream transmits the audio programme as usual. The
still images might contain news, the weather report, or information
about the current music programme. The complete service only
requires very low data rate of about 50kbit/s.
 more Information:
Contact:
Thorsten Selinger
Fraunhofer Institut für Nachrichtentechnik, Heinrich-Hertz-Institut
Einsteinufer 37, 10587 Berlin
Fax:+49-30-392 72 00
Tel. +49-30-31002-607
Email: selinger@hhi.fraunhofer.de
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