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Description: For the transparent consumption of radio services either via DAB or IP, the same level of metadata and data services for both of the transmissions is necessary. Otherwise, the listener would notice the (even temporary) switch over from DAB to IP and back. Rebuilding the same level of audio- and data services in IP delivered scenarios could be difficult for the following topics: Seamless audio switching: Switching between DAB+ (HE-AAC) and IP based audio (MP3 or HE-AAC) is rather difficult because of the fact, that normally different processing workflows, often even on different locations, are used. Different delay times and audio levels are the consequences which are hard to correlate. Data services (DL+ and SLS): The provision of a Slideshow service and DynamicLabel+ in DAB is more or less obligatory. These services are transmitted “in Band” as additional information, which synchronizes them perfectly to the audio signal. Although RadioVIS provides alternatives, it cannot provide the same tight synchronization to the audio service as DAB. Announcement support: As a radio technology the support of announcements (Traffic, Alarm, Emergency) always have been in the core DNA of DAB. Surely server push information to the clients exists, however compared to the “in Band” broadcast announcements either additional IP ports or technologies such as web sockets or even proprietary systems have to be used. The proposed paper shows as a solution by using DAB data for streaming over IP. The presentation covers the development from the HRADIO H2020 Project, including a insight to the use-cases, which led to the development, to use DAB EDI single service streams as a delivery protocol for IP Radio streaming. The same signal the broadcasters use for the DAB transmission will be reused by a server component which splits the whole ensemble of DAB services into single service EDI streams. Service following becomes easy in the same bitstream, data services and announcements are included. On the client side the demultiplexing is realized with C++ (for iOS and Android) and or C++ to JavaScript via the emscripten tool chain.
DAP IP Radio
DAP IP Radio
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| views | 17 | |
| downloads | 12 |

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