Professional hardware and software solution for T-DMB media broadcasting
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.
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.
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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.
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.
Visual Radio
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:
Flyer: Visual Radio (*.pdf) 
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