what is digital audio broadcasting? what is digital audio broadcasting? fm dab? fm dab? benefits of...
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What is What is DDigital igital AAudio udio BBroadcasting?roadcasting?
FM DAB?FM DAB?
Benefits of using DABBenefits of using DAB
History of DABHistory of DAB
The DAB system in HKThe DAB system in HK
What is What is DDigital igital AAudio udio BBroadcasting?roadcasting?
FM DAB?FM DAB?
Benefits of using DABBenefits of using DAB
History of DABHistory of DAB
The DAB system in HKThe DAB system in HK
What is DAB?
Analog audioAnalog audio signalsignal
DataData
Signal Processor
A/D Converter
A/D Converter
Single FrequencyNetwork
The quick brown fox jumps right over the lazy dog tail
Digital Audio SignalDigital Audio Signal
What is DAB?
FM Vs DAB
FM DAB
Sound Quality Long Playing
Record Near CD
Mobile Reception
Slightly Interfered
Interference free
Network Frequency
Multi-frequencies
Single Frequency
Image Broadcasting
FM Vs DAB
FM DAB
Receiver Cost Less Than Hundred $
Around $1200
Real Time Broadcasting ?
Yes < 1 second
delay
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
88 108
Benefits of using DAB
Interference free mobile reception
Multiplex
Dynamic Range Control
Benefits of using DAB
Multi-media
Multi-media
History of DAB
Digitalization was proposed by the British Broadcasting Corporation. The NICAM system is one of their products.
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History of DAB
The first generation of the DAB system was demonstrated in Switzerland.
80 88 90 94 97 98 99
History of DAB
USA did not adopt this development. They develop another digital audio system.
80 88 90 94 97 98 99
History of DAB
The European standard (Eureka-Eureka-147147) was accepted as the int’l standard for DAB.
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History of DAB
China ran a trial in Fo Shan city, Guangdong province.
A trial system was set up in HK for testing.
80 88 90 94 97 98 99
The DAB system in HK
Digital Audio Broadcasting Steering Committee
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The DAB system in HK
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.
80 88 90 94 97 98 99
FM Station
AM Station
Castle Peak
CloudyHill
GoldenHill
BeaconHill
KowloonPeak
MountGough
LammaIsland
PengChau
Transmitter Site Map
DAB Station
Beacon Hill
Mt. Gough
香港電台發射站位置圖Transmitter Site Map
FM Station
AM Station
Castle Peak
CloudyHill
GoldenHill
BeaconHill
KowloonPeak
MountGough
LammaIsland
PengChau
Transmitter Site Map
DAB StationCoverage oftransmitter at
Mt. Gough
Coverage oftransmitter atBeacon Hill
香港電台發射站位置圖Transmitter Site Map
The DAB system in HK
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.
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The DAB system in HK
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
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DABDAB’s capability:’s capability:
Enhanced service and better sound Enhanced service and better sound quality for quality for audienceaudience
New market for the New market for the media sectormedia sector
AudioAudio + + DataData = = DDigital igital AAudio udio BBroadcastingroadcasting
FMFM DABDAB