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

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