| Digital
Audio Broadcasting |
Definition
Digital audio broadcasting, DAB, is the most fundamental advancement in radio
technology since that introduction of FM stereo radio. It gives listeners interference
- free reception of CD quality sound, easy to use radios, and the potential for
wider listening choice through many additional stations and services. DAB
is a reliable multi service digital broadcasting system for reception by mobile,
portable and fixed receivers with a simple, non-directional antenna. It can be
operated at any frequency from 30 MHz to 36Hz for mobile reception (higher for
fixed reception) and may be used on terrestrial, satellite, hybrid (satellite
with complementary terrestrial) and cable broadcast networks. DAB
system is a rugged, high spectrum and power efficient sound and data broadcasting
system. It uses advanced digital audio compression techniques (MPEG 1 Audio layer
II and MPEG 2 Audio Layer II) to achieve a spectrum efficiency equivalent to or
higher than that of conventional FM radio.
The efficiency of use of spectrum
is increased by a special feature called Single. Frequency Network (SFN). A broadcast
network can be extended virtually without limit a operating all transmitters on
the same radio frequency. EVOLUTION
OF DAB DAB has been under development since
1981 of the Institute Fur Rundfunktechnik (IRT) and since 1987 as part of a European
Research Project (EUREKA-147). " In 1987
the Eureka-147 consoritium was founded. It's aim was to develop and define the
digital broadcast system, which later became known as DAB.
" In 1988
the first equipment was assembled for mobile demonstration at the Geneva WARC
conference.
" By 1990, a small number of test receivers was manufactured.
They has a size of 120 dm3
" In 1992, the frequencies of the L and S
- band were allocated to DAB on a world wide basis.
" From mid 1993 the
third generation receivers, widely used for test purposes had a size of about
25 dm3, were developed.
" The fourth generation JESSI DAB based test
receivers had a size of about 3 dm3. 1995 the
first consumer - type DAB receivers, developed for use in pilot projects, were
presented at the IFA in Berlin.
You may also like this : Wireless USB, Zero Knowledge Protocols and Proof Systems, Tempest and Echelon, Synthetic Aperture Radar System, Unlicensed Mobile Access, Windows DNA, Laptop Computer, Intelligent Software Agents, IP spoofing, Internet Access via Cable TV Network, IDS, 10 Gigabit Ethernet, Tripwire, Ubiquitous Networking , Unicode And Multilingual Computing, XML Encryption , Y2K38 , Satellite Radio , Light emitting polymers , Sensors on 3D Digitization , Robotic Surgery , Ipv6 - The Next Generation Protocol , Nanorobotics , Dual Core Processor , Cisco IOS Firewall , Iris Scanning , LWIP , Smart card , Quantum Information Technology, Asynchronous Chips , Cellular Through Remote Control Switch , HVAC, Terrestrial Trunked Radio , Swarm intelligence & traffic Safety , Optical Switching , FRAM , IDC , Driving Optical Network Evolution , Cellular Neural Network , Radio Network Controller , Digital Audio Broadcasting , Significance of real-time transport Protocol in VOIP , Space Mouse , Resilient Packet Ring Technology , Wireless Networked Digital Devices, SATRACK , Smart Pixel Arrays , Project Oxygen , Wearable Bio-Sensors , Mobile Virtual Reality Service,IT Seminar Reports, PPT and PDF.
|
<<back |
