Grundig Digital Radio manual Table A.2 Example of possible number of programs, Audio Quality

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DIGITAL RADIO GUIDE

APPENDIX A: EUREKA 147

Table A.2: Example of possible number of programs

Audio data

 

Protection level (increasing protection)

 

rate (kbps)

5

4

3

2

 

1

 

 

 

 

 

 

 

24*

N/A

64

48

36

 

24

32

54

41

36

29

 

24

 

 

 

 

 

 

 

64

27

20

18

14

 

12

128

13

10

9

7

 

6

 

 

 

 

 

 

 

192

9

7

6

5

 

4

 

 

 

 

 

 

 

224

7

6

5

4

 

3

256

6

5

4

3

 

3

 

 

 

 

 

 

 

* At most audio data rates, Eureka 147 uses Unequal Error Protection an error protection procedure which allows the bit error characteristics to be matched with the bit error sensitivity of the different parts of the audio frame. At the lowest data rate, 24 kbps, Eureka 147 uses Equal Error Protection, an error protection procedure which ensures a constant protection of the bit stream.

Audio Quality

ITU R Recommendation BS.1115 specifies use of MPEG 1 Layer II at 256 kbps (stereo mode), for broadcast applications requiring CD quality. This recommendation is based on subjective listening tests undertaken in 1992. At the time, MPEG 1 Layer II at 192 kbps (joint stereo mode) was also tested but was found to only marginally meet the audio quality requirement. Additional tests in 1993 failed to reveal sufficient improvement in the codec to warrant inclusion of this lower data rate in the ITU recommendation.

Further listening tests were performed in 1995, as part of the US Electronic Industries Association’s (EIA) evaluation of digital radio systems. A range of audio coding systems were tested including MPEG 1 Layer II at 224 and 192 kbps (joint stereo modes). The findings of this work indicate the MPEG 1 Layer II codec at 224 kbps is capable of meeting the basic audio quality criteria specified by the ITU R. The lower rate of 192 kbps again failed to meet the required quality.

Spectrum Issues

Eureka 147 Channel Plans

In 1995, the introduction of terrestrial Eureka 147 was discussed by the European Conference for Posts and Telecommunications (CEPT) in Wiesbaden.17 In cooperation with representatives of regional and international organisations such as the EBU, the European Commission and the ITU a total of 73 channels to be used for future and current digital audio broadcasting services was agreed. Each channel is 1.536 MHz wide with appropriate guard bands between each channel and at the edge of each band.

17Final Acts of the CEPT T_DAB Planning Meeting (3)”, Maastricht 2002,CEPT, http://www.ero.dk/52EB3135-F356-49FF-A970-B32D2C745921?frames=0

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Contents Page Page Foreword Page Table of Contents Appendix C Glossary of Acronyms Introduction What is Digital Radio? Digital Radio Systems Terrestrial in service date Satellite Service dateDRM+ Why Digital Radio? DRM Digital Radio Mondiale Terrestrial Transmission SystemsOverall design Brief Description of the DRM SystemDistribution Interface DRM Source Encoding and Decoding Audio Source CodingDRM Source Decoding Channel coding and modulation Over the air Transmitter Considerations4 DRM+ System Development DAB EurekaPrincipal Advantages and Challenges System DescriptionChallenges Belgium DAB Development Worldwide asCanada DenmarkGermany FranceItaly SingaporeSpain South KoreaSweden SwitzerlandUnited Kingdom Main System Features Eureka 147 Main System FeaturesInfrastructure Requirements Synergies with Other SystemsSynergies with Digital Radio Mondiale DRM Synergies with Digital Television Future Developments of DABDAB-Based Multimedia Broadcast Systems DMB T-DMB DAB-IP IP over Enhanced Packet ModeGerman DXB Project Enhanced Audio Codec, DAB+ DAB as carrier of multichannel audioDigital Radio Guide Terrestrial Transmission Systems DAB Types of Receivers Conceptual diagram of the outer coder and interleaverIn-Car Receivers In-Home ReceiversHandheld Receivers PC ReceiversJVC List of manufacturers and their DAB productsTeac Overview Japans Digital Radio Broadcasting ISDB-TSBMethods Audio encoding systemMultiplexing System Error correction systemTransmission channel encoding system Modulation method Transmission bandwidthsHierarchical transmission and partial reception Data Segment SpectraPage Parameter restrictions in connected transmission Example of connected transmission three TS’sInformation bit rates for the triple-segment transmission*5 Transmission capacitiesReceivers CharacteristicsTrial receivers Overview of ServicesReceivers expected Multiple voice broadcastingOutlook for the Future Download service experimentBroadcasting of simplified moving images IBiquity HD Radio System HD Radio AM and FM Receivers HD Radio Standards ActivityTypical HD Radio Automobile Receivers HD Radio System Technical Design OverviewMain Program Service MPS Core ServicesStation Information Service SIS Advanced Application Services AASHybrid Waveform Waveforms and SpectraFM Extended Hybrid Waveform FM All Digital Waveform 12 Hybrid AM HD Radio system spectrum allotment HD Radio Subsystems13 Functional Block Diagram of HD Radio System RF/Transmission System Receiver SystemsSound Quality Features Common to North American Digital Radio SystemsMultipath Resistance Audio Quality Ratings Frequency ResponseMpeg AAC Infrastructure Requirements Licensees Deployment StatusSpectrum Availability Issues related to Terrestrial SystemsCase Study Allocations in Region DAB DVB-T 18 RRC-06 planning area19 T-DAB coverages in Band Entries HD Radio Iboc Implications of SimulcastingDRM Digital Radio Mondiale CoverageDigital Radio Guide Terrestrial Transmission Systems Issues WorldSpace ITU-R System D Satellite TransmissionBroad Picture WorldSpace Coverage Map Transmission Footprints WorldSpace Up-link Coverage JVC Sirius Satellite Radio / XM Satellite Radio Sirius Overview Sirius Sdars Delivery System Raan Sirius ConstellationSirius Ground Track TT&C Deployment StatusContinental US Satellites Ground RepeatersMobile Broadcasting Corp. and TU Media Corp. ITU-R System E Introduction Internet Radio IRBringing Radio to the Internet Internet Radio peculiarities Internet Radio as a complement to established radio services Internet-only stations IR Portals and Music Portals Streaming technology for radio servicesDistribution networks Server-clientP2P networks WiMAX MulticastingPodcasting Internet Radio terminals and playback devicesInternet Radios relation with the traditional radio Measuring audience Digital Radio Guide Internet Radio 10.1 VRT Case studiesVirgin Radio Swedish Radio multichannel audio distribution Summary and ConclusionsBeethoven Some Important Radio PortalsLaunch Music on Yahoo Launch.yahoo.com LiveRadio VH1 IM TuningLast FM MTV RadioSHOUTcast Some Sources for the Digital Radio Guide Etsi Cenelec IEC Digital Radio Guide Sources Appendix a The Eureka 147 System System Description Major System FeaturesOverview Table A.1 Eureka 147 Transmission Parameters Modes of OperationIII Data CapacityNumber of audio services in a multiplex Data ServicesTable A.2 Example of possible number of programs Spectrum Issues Eureka 147 Channel PlansAudio Quality ITU DSB Handbook Planning ParametersVHF Band Propagation PropertiesBand 1452-1492 MHz Multimedia Object Transport MOT Recent system developmentsDynamic Label Slide Show Broadcast WebsiteElectronic Programme Guide EPG Etsi DAB Virtual Machine DAB JavaDAB Receiver Interfaces Conditional AccessFile caching in the receiver SBR LayerTopNews Tpeg transport in DAB IP datacasting in DABTable A.3 Etsi Standards relating to Eureka Advanced demodulation technique for CofdmNumber Title Third EditionGSM / Pstn / Isdn / Dect Table A.4 Receiver Standards for Eureka Receiver StandardsReference Title ITU Publications and RecommendationsBBC DAB Appendix B Relevant World Wide WebsitesNasb 111 Glossary of Acronyms Drdb DRBDRM DRPIfpi IeeeISDB-TSB ITUPAD P2PPDA PNGTdma TDMTMC TmccDisclaimer

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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