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Digital Audio Broadcasting

Digital Audio Broadcasting. What is D igital A udio B roadcasting? FM DAB? Benefits of using DAB History of DAB The DAB system in HK. >. Digital Audio Signal. Analog audio signal. Single Frequency Network. The quick brown fox jumps right over the lazy dog tail. Data.

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Digital Audio Broadcasting

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  1. Digital Audio Broadcasting

  2. What is Digital Audio Broadcasting? • FM DAB? • Benefits of using DAB • History of DAB • The DAB system in HK

  3. > Digital Audio Signal Analog audio signal Single Frequency Network The quick brown fox jumps right over the lazy dog tail Data What is DAB? A/D Converter Signal Processor

  4. What is DAB?

  5. FM Vs DAB

  6. FM Vs DAB

  7. 88 108 Benefits of using DAB • No tuning anymore • Radio 1 : 92.6 ~ 94.4MHz • Radio 2 : 94.8 ~ 96.9MHz • Radio 4 : 97.6 ~ 98.9MHz

  8. Benefits of using DAB • Interference free mobile reception

  9. Multiplex

  10. Dynamic Range Control

  11. Multi- • media Benefits of using DAB

  12. Multi-media

  13. History of DAB 80 88 90 94 97 98 99 • Digitalization was proposed by the British Broadcasting Corporation. The NICAM system is one of their products.

  14. History of DAB 80 88 90 94 97 98 99 • The first generation of the DAB system was demonstrated in Switzerland.

  15. History of DAB 80 88 90 94 97 98 99 • USA did not adopt this development. They develop another digital audio system.

  16. History of DAB 80 88 90 94 97 98 99 • The European standard (Eureka-147) was accepted as the int’l standard for DAB.

  17. History of DAB 80 88 90 94 97 98 99 • China ran a trial in Fo Shan city, Guangdong province. • A trial system was set up in HK for testing.

  18. The DAB system in HK 80 88 90 94 97 98 99 Digital Audio Broadcasting Steering Committee

  19. The DAB system in HK 80 88 90 94 97 98 99 • The installation was conducted by the • Two transmitters were set up. One was in Mount Gough, HK island and the other one was in Beacon Hill, Kowloon.

  20. Transmitter Site Map 香港電台發射站位置圖 Beacon Hill Mt. Gough

  21. Transmitter Site Map 香港電台發射站位置圖 Coverage of transmitter at Beacon Hill Coverage of transmitter at Mt. Gough

  22. The project was implemented. Only music was broadcasted for testing. First phase field test was conducted to measure: audio quality, bit error rate & field strength. The DAB system in HK 80 88 90 94 97 98 99

  23. The DAB system in HK 80 88 90 94 97 98 99 • Second phase field test was conducted to: • Gather more information about mobile reception • Explore the feasibility of text and graphics transmission • Compare indoor receptions of DAD and FM signals • OFTA issued DAB reports

  24. FMDAB Audio + Data = Digital Audio Broadcasting DAB’s capability: Enhanced service and better sound quality for audience New market for the media sector

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