Introduction to Digital Audio Broadcasting Seminar Topic:
Introduction to DAB:
Digital audio broadcasting is an advanced technology used for transmission and reception in mobile communication. This is an advanced compressed technology by which we can achieve higher spectrum efficiency rather than a conventional FM radio signals. Digital audio broad casting technique came into existence in the year 1981 and is being developed to achieve higher efficiencies. In this paper we will discuss how this technique is employed in the networks to provide high quality audio output.
Working of Digital audio broadcasting:
The analog audio sequence will be converted into a digital audio sequence by using a sampler. The Digital audio broadcasting signals operate at a frequency ranging from 30 mhg to 3 ghz. The audio compression technique employed is MPEG algorithm.
To divide the input stream into multiple bands it is made to pass through a filter bank. In the channel codes present in the network each signal is coded individually and made to pass through a main service channel and they are multiplexed. We employ a orthogonal frequency division multiplexing technique by which more no of carriers are employed on the signal.
Applications and Advantages:
The digital audio broadcasting technique is employed for communication in terrestrial satellites and broadcast networks. By using digital signals we can achieve high noise immunity and these signals are reproductive when compared to normal analog signals. the digital audio signals allow various digital audio processing techniques to be employed.
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