Grundig Digital Radio manual SBR Layer, File caching in the receiver, TopNews

Page 105

DIGITAL RADIO GUIDE

APPENDIX A: EUREKA 147

commercial receivers using a common scrambling algorithm and a common receiver interface, however allowing the use of different commercial CA systems such as Simulcrypt and Multicrypt.

SBR Layer II

Spectrum Band Replication (SBR) is a process, proposed by Coding Technologies and now standardised within MPEG-4 Audio, designed to potentially improve spectrum efficiency of the DAB system by reducing the audio bit rate for the same quality, while retaining backwards compatibility. Some initial studies indicate that about 30% improvement could be achieved.

The EBU Project group B/AIM (Audio In Multimedia) is carrying studies on error sensitivity and compatibility with non-SBR receivers. Some preliminary results show that the inclusion of SBR in the DAB system does not significantly degrade the C/N performance of the DAB system, neither in terms of Threshold of Audibility (TOA) nor Point of Failure (POF).

Studies are continued on balancing the benefits and drawbacks of SBR. The matters to be addressed involve the increase of complexity (and thus cost) of the receiver and the related IPR issues. No decision has been taken by the WorldDAB Forum to date about the viability of using including SBR into the standard and recommending its incorporation into commercial receivers.

File caching in the receiver

The WorldDAB Forum has now established a specification for using an optional caching facility in the receiver. The user will benefit from a so-called "rewind radio," which will allow listening of the latest programme at any time. The caching device will also allow the user to use the DAB receiver as a PVR (Personal Versatile Recorder) device for time-shifted playout of audio events (with or without associated data). It should be pointed out the use of caching may change the way how people access and enjoy radio listening. It potentially widens the programming possibilities offered by the broadcaster but also introduces new technical and operational problems (copyright, EPG, etc).

In September 2003 RadioScape which specialises in digital radio software launched a new module called RS200L.24 One of the features of this module is the inclusion of Rewind Radio that enables about ten minutes of audio to be stored on chip RAM. This can be used to listen to a news clip again or time shift by pausing and resuming the radio. The module has been designed using the DRE200 chip from Texas Instruments, which is probably one of the world's best selling receiver chips for the EU 147 standard. This chip has now been superseded by a new version, DRE310,25 that can decode more than one channel simultaneously and includes time-shifted radio, announcement support, service linking (FM/DAB ensemble switching), TII (Transmitter Identification Information) and MP3/Windows Media Audio CD support.

TopNews

TopNews is a commercial name for Bosch/Blaupunkt's system which allows broadcasters (and multiplex providers) to download via a suitable DAB data channel (e.g. MOT, MSC packet mode) the news and other audio files or other objects coded in MP3 to the receiver.26 The user is appropriately informed of the existence of these audio objects and could access them at their convenience. The broadcaster is responsible for contents and needs to update the audio file

24http://www.worlddab.org/pressreleases/RADIOSCAPE-LAUNCHES-THE-RS200L.pdf

25http://www.worlddab.org/pressreleases/TI-uses-Radioscape-23-06-03.pdf

26WorldDAB TC 075 available from http://www.worlddab.org/tc_presentations/2

105

Page 104 Page 106
Image 105
Page 104 Page 106
Contents Page Page Foreword Page Table of Contents Appendix C Glossary of Acronyms Introduction What is Digital Radio? Terrestrial in service date Satellite Service date Digital Radio SystemsDRM+ 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 Future Developments of DAB Synergies with Digital TelevisionDAB-Based Multimedia Broadcast Systems DMB T-DMB IP over Enhanced Packet Mode DAB-IPGerman 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 broadcastingDownload service experiment Outlook for the FutureBroadcasting 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 AASWaveforms and Spectra Hybrid WaveformFM 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 SystemsFeatures Common to North American Digital Radio Systems Sound QualityMultipath Resistance Audio Quality Ratings Frequency ResponseMpeg AAC Infrastructure Requirements Licensees Deployment StatusIssues related to Terrestrial Systems Spectrum AvailabilityCase 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 Satellite Transmission WorldSpace ITU-R System DBroad 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 Internet Radio IR IntroductionBringing 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 Case studies 10.1 VRTVirgin 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 Major System Features Appendix a The Eureka 147 System System DescriptionOverview Table A.1 Eureka 147 Transmission Parameters Modes of OperationIII Data CapacityNumber of audio services in a multiplex Data ServicesSpectrum Issues Eureka 147 Channel Plans Table A.2 Example of possible number of programsAudio Quality ITU DSB Handbook Planning ParametersPropagation Properties VHF BandBand 1452-1492 MHz Multimedia Object Transport MOT Recent system developmentsDynamic Label Broadcast Website Slide ShowElectronic Programme Guide EPG Etsi DAB Virtual Machine DAB JavaDAB Receiver Interfaces Conditional AccessSBR Layer File caching in the receiverTopNews 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 RecommendationsAppendix B Relevant World Wide Websites BBC DABNasb 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.
Top Page Image Contents