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Table of Contents
In and about DAB
Technical Overview
Transmitting and Receiving
DAB's Benefits
Tangible Impact of DAB
Conclusion and Summary of Terms

Reviews

Digital Audio Broadcasting
Page 1 of 6
Author: fireconda
Date of review: 09-July-2000
Type Of Review: Articles/Editorials

The beginning
This article is for anyone who is interested in the technological advances in the world today. The topic is on DAB and this article will give you a little insight into this new technology, along with some technical backgrounder.



Ok now, Lights, Camera and ACTION!

Introduction
Radio - the process of sending invisible electrical waves from one place to another. Even with the advent of television, radio still remains as one of our most important means of communication. Broadcasting is the most familiar form of radio. It includes music, news, discussions, interviews and advertising. We all wake up to clock radios, ride to work accompanied by car receivers, and spent our leisure time listening to favourite radio programs. Radio has unknowingly become part of our lives.

It works by changing sounds or other signals into electromagnetic waves. These waves are called radio waves. Produced by a transmitter, these waves travel at 299,792 km per second through air. Upon arrival, the receiver changes the signals back into the original sounds. In the past, radio waves are transmitted in 2 ways: amplitude modulation (AM) and frequency modulation (FM). Now comes the new and better way of broadcasting… DAB!


Simplified block diagram of a digital radio system


About DAB
DAB - Digital Audio Broadcasting or simply Digital Radio is the most fundamental advancement in radio technology since the introduction of FM/AM Stereo radio. The system was defined by the Eureka 147 Project - an international consortium of broadcasters, network operators, electronic industries and research institutes.

FM/AM radio signals (analog) have been subjected to numerous kinds of interference or noise as you call it, when travelling from the transmitter to your radio. These problems were mostly caused by high-rise buildings and weather conditions. Of course in other countries, mountainous terrain will play a part in this too.

Well, these problems will no longer exist when using DAB. With this new broadcasting technique, you can receive CD-like quality music even in the car without any annoying interference and signal distortion. The main draw here is undistorted CD-like quality sound.

Besides the transmission of audio, text, pictures and data, even videos are in the airwaves. You might want to know how it could be done, the cramping of all these stuffs within the limited frequency bands. More on these later…



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