DIGITAL RADIO GUIDE

APPENDIX A: EUREKA 147

APPENDIX A The Eureka 147 System - System Description

Overview

The Eureka DAB System has been designed to ensure rugged and reliable reception by listeners using fixed, portable or mobile receivers with non-directional antennas. The system is spectrum and power efficient (equivalent or better than FM radio) and can be operated at any frequency up to 3 GHz for mobile reception and at higher frequencies for fixed reception. It is suitable for use on terrestrial, satellite, hybrid (satellite with complementary terrestrial) and cable networks. It currently uses the following audio compression techniques, MPEG 1 Audio Layer 2 and MPEG 2 Audio Layer 2 and supports a range of audio coding rates. It has a flexible digital multiplex, which can support a range of source and channel coding options. This includes programme associated data (PAD) services and independent data services (IDS).

Eureka 147 is currently the only digital audio system that has met all the requirements of the ITU for a new digital sound broadcasting system. It is designated ‘Digital System A’ and has the status of a world-wide standard (ITU-R Recommendations BS 1114 and BO 1130 for terrestrial and satellite sound broadcasting respectively). It is an open standard, fully specified within the European Telecommunications Standards Institute (ETSI), in ETS 300 401.

The system provides strong error protection in the transmitted signal. The information transmitted is spread in both the frequency and time domains and the effects of channel distortions and fades are eliminated from the recovered signal in the receiver. This is achieved even when the receiver is in a location with severe multipath propagation, whether stationary or mobile.

Efficient utilisation of the spectrum is achieved by interleaving multiple programme signals and by the system’s ability to operate additional transmitters as gap fillers in a single frequency network (SFN). A gap-filling transmitter in this arrangement receives and re-transmits the Eureka 147 signal on the same frequency.

Major System Features

Like almost all digital radio systems, Eureka 147 uses standard audio compression techniques and COFDM. As Eureka 147 was the first standardised digital radio system, the audio compression techniques used in all Eureka 147 implementations are now somewhat dated.

A Eureka 147 transmission has an emission bandwidth of 1.536 MHz, which is capable of providing a range of useful data rates depending on the level of protection. The multiplex contains audio programs; program associated data and, optionally, other data services. Each audio program or data service is independently error protected with a variable coding overhead, the amount of which depends on the requirements of the broadcasters (transmitter coverage and reception quality). A specific part of the multiplex contains information on how the multiplex is configured, so that a receiver can decode the signal correctly, and, possibly, information about the services themselves, the links between different services, and conditional access information for subscription services.

Eureka 147 is a mature system with 29 standards and related documents published by the European Telecommunication Standards Institute (ETSI). The ITU has included details of the Eureka 147 system in its Digital Sound Broadcasting (DSB) Handbook and Recommendations BS.1114 and BO.1130.

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Grundig Digital Radio manual Appendix a The Eureka 147 System System Description, Overview, Major System Features
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Digital Radio specifications

The Grundig Digital Radio represents a significant advancement in radio technology, combining aesthetics, functionality, and a user-friendly interface. As a pioneer in the audio and electronics industry, Grundig has successfully integrated modern digital capabilities into its traditional radio design, appealing to both nostalgic listeners and tech-savvy users.

One of the standout features of the Grundig Digital Radio is its versatility in reception. With DAB+ (Digital Audio Broadcasting) technology, users can enjoy a wide array of radio stations with superior sound quality, free from the hiss and interference commonly associated with analog broadcasts. The inclusion of FM and AM bands ensures that listeners are not limited, providing access to local stations that may not yet have transitioned to digital.

The Grundig Digital Radio is designed with ease of use in mind. Its intuitive interface, often featuring a clear LCD display, allows users to navigate through stations and settings effortlessly. Many models also include a built-in tuner that automatically scans and presets available stations, simplifying the setup process. For those who appreciate personalization, some variants come equipped with customizable presets, allowing users to save their favorite stations for quick access.

Portability is another key characteristic of the Grundig Digital Radio. Many models are lightweight and come with built-in handles, making them ideal for on-the-go listening, whether it's in the garden, on the beach, or during a picnic. Battery options, alongside mains power, ensure that users can take advantage of their radios wherever they choose.

In terms of sound quality, Grundig utilizes advanced audio technologies to deliver rich and clear sound. Enhanced bass responses and treble controls allow users to fine-tune their listening experience to match their preferences. Furthermore, many models feature additional inputs, such as AUX and USB ports, enabling users to connect their smartphones or other devices, expanding their audio options.

Other notable characteristics include built-in alarms and timers, which make the Grundig Digital Radio a versatile companion for daily routines. Some models even support Bluetooth connectivity, allowing for seamless streaming from a variety of devices.

In summary, the Grundig Digital Radio embodies the perfect blend of traditional radio appeal and modern digital technology, offering versatility, ease of use, superior sound quality, and portability to meet the diverse needs of today’s listeners. Its well-thought-out features and user-friendly design make it an excellent choice for anyone looking to enhance their audio experience.
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