By Topic

Broadcasting Convention, 1995. IBC 95., International

Date 14-18 Sep 1995

Filter Results

Displaying Results 1 - 25 of 96
  • Digital audio broadcasting-the future of radio

    Page(s): 57 - 61
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (320 KB)  

    September 1995 is a month of considerable significance in the history of radio. It is the month in which DAB enters its operational phase as the BBC starts its Network Radio services, and as substantial pilot schemes get under way in Germany and other European countries. The Eureka 147 technology, on which so much development work has been done, has demonstrated its capabilities; it is now up to the broadcasters and other service providers to realise the potential and to use it for the benefit of the consumer. The BBC has made a major and early commitment because it believes that DAB is the right technology and that DAB will help to ensure that radio remains a vital means of human communication in the next century. And not only for terrestrial services. As one of the largest international broadcasters, the BBC sees satellite-delivered digital audio broadcasting as the long-term replacement for short-wave. The present paper sets out: 1. Why the BBC sees the future of radio in DAB. 2. What the main issues and problem areas are. 3. How the BBC intends to turn its aspirations for DAB into reality View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Digital Audio Broadcasting receiver development

    Page(s): 71 - 75
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (204 KB)  

    Digital Audio Broadcasting (DAB) was developed by the European Eureka-147 project. This system has many technical advantages of modulation coding (COFDM), error correction (Viterbi decoding) and source coding (MUSICAM). DAB is used for high speed data broadcasting to mobile vehicles and can provide CD quality audio programs and various data to drivers. The prototype DAB receiver is designed using multiple general purpose DSPs and consists of an RF part, OFDM decoder, Viterbi decoder and MUSICAM decoder. The DAB system is described and the first prototype DAB receiver is introduced. In addition, our first field testing in Toronto and DAB future possibilities are also described View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Live TV news reporting from every home

    Page(s): 351 - 356
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (308 KB)  

    By bringing together the techniques of: video compression (MPEG), high speed access over existing telephone lines (ADSL) and the metallic line test capabilities in every exchange, it is possible to have live TV news reporting from nearly every home, with only small scale enhancement of the network. The author shows how this service can be provided and how it can be used. This service called RATTLE (Remote Access to Television Through the Local Exchange). The use of MPEG and ADSL will not replace all the current outside broadcast units, it will supplement them. When the network knows some major event is going to happen then the full outside broadcast capabilities are essential, but for simple news reporting this should be a major step forward in flexibility, and fast news reporting View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • TV listings databases and the multimedia interface for electronic programme guides (EPGs)

    Page(s): 223 - 225
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (184 KB)  

    While the further explosion of channels on the digital multi-media horizon, how will broadcasters be able to cope with the increased demand, from traditional and new electronic publishers, for detailed scheduling information about their programmes? This paper offers comments on the realities of data collection in a world moving ever faster towards `electronic programme guides' (EPGs) and hence the need for real-time data capture, management and distribution. The comments are intended to make clear some of the practical issues of TV listings distribution. Infomedia S.A. is an on-line information service company that collects, processes and provides Europe's most comprehensive electronic TV listings data source View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Digital compression and the international TV marketplace

    Page(s): 372 - 376
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (360 KB)  

    INTELSAT are involved in every aspect of international satellite video and we have every kind of digital video application on our fleet of satellites. We see the international video market at a turning point. We see all the new applications and all the new technology to support them. We believe the combination of these elements will allow many new market sectors to open in the international satellite video area in the near future. Digital compression will allow video channels to be designed to have lower cost which will enable new multimedia, business TV and narrowcaster customers to transmit video by satellite View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • To and from the wide screen: aspect ratio conversion

    Page(s): 554 - 558
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (228 KB)  

    The 16:9 aspect ratio is a key feature of all proposed new and enhanced television systems; it will rapidly become the standard for television displays. More and more programme material is being made in this wide screen format and there is an increasing need for programme producers and broadcasters to work with both conventional and wide screen material. It would be quite intolerable if programme material were prevented from being used in a particular programme or channel because it had the `wrong' aspect ratio. This paper briefly reviews the requirements for an aspect ratio converter equipment and describes some of the technical features of a currently available unit View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Spatial prediction in scalable video coding

    Page(s): 244 - 249
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (352 KB)  

    Spatial scalability allows the transmission of images at different levels of resolution in a single bit stream, offering potential spectrum savings with respect to simulcast transmission. The authors consider a two-layer MPEG-2 system which uses spatial scalability to transmit a conventional television signal as a base layer, and an HDTV signal as an enhancement layer or alternatively a conventional television signal as the enhancement and a SIF interlaced signal as the base layer. The issue of interlaced to interlaced conversion, and its effect on the overall performance are studied. The usefulness of the base layer signal in the prediction of the upper layer signal is discussed. Finally, the performance of spatial scalability is compared with a simulcast approach for different bit rates at the lower layer, while keeping the overall bit rate constant View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Transmission of digital signals over MMDS

    Page(s): 189 - 194
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (392 KB)  

    The paper focuses on the work being undertaken with regard to the testing of the suitability and applicability of 64-QAM modulated signals over MMDS. The work is part funded under the accompanying measures of `Digital Image Transmission' of the EU RACE II programme as the project DIMMP. The paper outlines briefly the market penetration and service characteristics of MMDS as an analogue transmission medium and the related functionality of such a system. Service comparisons with competing delivery media are described. The required equipment functionality at the transmit chain for the introduction of digital services is then analysed. There follows a description of the equipment configuration for undertaking a series of trials involving the transmission of a 64-QAM signal in an 8 MHz channel at 2.5 GHz. The trials assess the threshold C/N for acceptable BER rates, the associated power efficiency, the impact of phase noise, the appropriate channel coding and the permitted rolloff when used in channels adjacent to analogue PAL signals. The related testing methodology together with some results are then outlined. Finally, the demonstration scenario for the broadcasting of a four programme multiplex over a single MMDS channel is developed View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • DVCPRO: playing to the strengths of tape

    Page(s): 488 - 493
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (280 KB)  

    The television production and transmission world are in a state of flux. New developments challenge traditional thinking with almost monotonous regularity. Yet some things seem never to change; last years' programmes were worse than this years and a new VTR format is about to be released are two of the given truths of the TV business. Even now, in the age of generally available hard disc video recording, the second holds true. This paper examines the case for a new VTR format in general and argues that to compete in a world where other solutions may be possible, tape based systems will need to specialise to succeed. The DVCPRO recording format is an example of this new approach, by focusing on ENG acquisition it can offer system advantages not possible with other technologies or general purpose systems View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Shared use of a satellite transponder by analog and digital carriers

    Page(s): 559 - 563
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (288 KB)  

    This paper examines the effects of interference between an analog television carrier and a digital carrier, or multiple digital carriers, coexisting in a single satellite transponder. As the satellite distribution of video and audio signals progresses toward the use of digital transmission, it is becoming more and more common to find an analog television carrier sharing a transponder with a digital television carrier. In some cases, multiple digital carriers share a single transponder with an analog television carrier. The results of laboratory measurements and over-the-air tests are presented. The practical aspects of analog and digital carrier coexistence, including required power backoff values and resulting receive antenna sizes, are discussed View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Neural network technology for image compression

    Page(s): 250 - 257
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (496 KB)  

    The paper presents an extensive survey on the development of neural network technology for image compression. Three main categories are covered. These include neural networks directly developed for image compression, neural network implementation of traditional algorithms and development of neural network based technology which provides further improvements over the existing image compression algorithms. The author concludes that neural networks still have a long way to go before substantial improvement over traditional image compression algorithms can be achieved View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Practical implementation of the WD/TD optical network in a broadcast station

    Page(s): 458 - 463
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (300 KB)  

    The paper explains the basic design concept of the video/audio signal network in the new broadcast station of Fuji Television Network Inc. The newly developed wavelength-division and time-division hybrid multiplexed (WD/TD) optical network will be implemented in order to extend possibilities in the multimedia era. The WD/TD optical network is the rational system to reduce drastically the work of the distribution operator in the signal distribution center. A prototype WD/TD optical network has been developed to examine the basic operation and preliminary reliability issues. The prototype has been designed to distribute/transmit 240 digital NTSC video signals, employing a newly developed flat gain optical amplifier, and 2.29 Gb/s time-division multiplexer/selector. The prototype is undergoing field trials at the master control room of Fuji Television Network Inc. Based on the results of the trials, the network in the new broadcast station will be designed and constructed. The authors think that this system will become a major system for distribution and transmission View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design concepts for digital television transmitters

    Page(s): 41 - 46
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (328 KB)  

    Standards for the transmission of digital terrestrial television services are not yet finalised in either Europe or North America, however enough work has been done to facilitate the development of digital television transmitter design. Initial studies have shown that in the USA, where simulcasting and broadcast coverage areas are to be maintained, high power transmitters utilising RF tube based products will be required. However, in Europe lower power systems using solid state transmitter technologies will fulfil most requirements. This paper will discuss the design techniques necessary for solid state digital transmitters, using both (OFDM), orthogonal frequency division multiplex and (8-VSB) 8-level vestigial sideband modulation. The design philosophies will be considered in terms of modulation considerations, system requirements, linearity correction and efficiency View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Closing the loop-payment on demand for interactive services

    Page(s): 395 - 400
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (308 KB)  

    For services such as video-on-demand and pay-per-view or pay-per-play to develop, there is a requirement for general purpose digital cash: a replacement for notes and coins with the additional functionality of supporting cash transactions over networks. True digital cash will allow consumers to make impulse buys from independent content retailers without registering accounts or handing over their credit card details. With the announcement of the first such scheme in the UK, businesses can begin to develop real strategies for shifting customer-supplier cash-based transactions into cyberspace. This paper draws on some of Hyperion's recent experience in helping to develop the Mondex digital cash scheme-and other projects ranging from the re-engineering of bank branch businesses to procuring satellite-based communications networks for developing countries-to demonstrate the radical changes that digital cash allows in infobahn-based businesses View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A digital audio production system

    Page(s): 202 - 207
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (316 KB)  

    The digital broadcast studio has awaited for some time an audio production system capable of handling large-scale events. The key is the capacity to handle a very large number of inputs & outputs without the need for a complex and expensive matrix switcher. In the system described, digital signals are bundled into high-capacity serial links that join physically remote I/O resources with 95 channels of full-specification audio in each direction. Multiple links, representing a very large number of sources, are managed and distributed by a resource-hub capable of supporting multiple digital and analogue consoles. The system is synchronous and video-locked, with sample-rate converted/resynchronised inputs and outputs where necessary. All processing is digital and fully automated. The console may be reset globally or selectively. Remote microphone amplifiers are controlled directly from the console to provide an optimised analogue signal to a high-precision convertor. Programmable control and a comprehensive events system allows detailed control of, and from, external equipment View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Improved motion estimation for MPEG coding within the RACE `COUGAR' project

    Page(s): 238 - 243
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (428 KB)  

    The COUGAR project (an EC-funded project within the RACE programme) is studying the use of high-quality motion estimation methods to provide vectors and other control information for the MPEG-2 coder being developed in the project. It is hoped that the use of a motion estimator, optimized to produce `true' motion vectors, will lead to higher quality pictures compared to the use of a simple `best match' motion estimator. This may be particularly significant in the presence of artefacts such as noise, grain and unsteadiness. The approach is driven by the observation that it is possible to perform high-quality motion-compensated temporal interpolation (for example, in standards converters and advanced slow motion generators) and obtain excellent results, without the use of any prediction error signal to correct errors in the interpolation View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Terrestrial transmission of DTVB signals-the European specification

    Page(s): 79 - 84
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (352 KB)  

    Considering the developments of the collaborative R&D projects dTTb, HD-DIVINE and HDTVT this paper describes the specification for a European, terrestrial DTVB system, which has been drafted under the umbrella of the European DVB project. This system has been designed to meet the user requirements established by the terrestrial commercial module (TCM) of DVB concerning flexibility, concerning suitability for fixed and portable reception and concerning SFN operation. An OFDM system with concatenated error correcting coding and an optional two level hierarchy for channel coding/modulation has been specified. This system is suitable for digital multi-programme transmission in existing UHF spectrum allocation while providing sufficient protection against co-channel and adjacent-channel interferences emanating from existing PAL/SECAM services. It shows a high degree of commonality with the DVB-systems for satellite and cable by using the same standards for audio and video coding as well as for transport multiplex according to the MPEG-2, an identical outer coding (RS) scheme and a similar inner coding scheme View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Satellite digital TV reception through domestic TV networks (SMATV)

    Page(s): 517 - 523
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (396 KB)  

    Domestic TV networks (SMATV/MATV systems) have been identified as a dominant TV reception scenario in some areas, with clear advantages in terms of cost and complexity for satellite TV reception, allowing cost sharing among groups of users. The future will bring a new revolution in the broadcasting field due to the expansion of satellite digital TV technology. The paper analyses the role of satellite master antenna TV (SMATV) systems in the quick introduction of satellite digital TV, assuring the commercial success of any new broadcasting system. A review of the SMATV scenario is carried out, introducing the definition and concepts around digital TV through SMATV. System options for the DVB-SMATV systems are presented, as they have been established in the frame of the European DVB project, having been the basis for the European and International standardization process around SMATV. The authors review technical aspects which are of great interest to manufacturers and operators, giving also a picture of state of the art SMATV applicable equipment, highlighting the common pieces (user IRDs) with CATV and DTH systems. Finally, the innovative concepts are presented for SMATV based interactive TV services using a satellite based return channel View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • CD3-OFDM: a new channel estimation method to improve the spectrum efficiency in digital terrestrial television systems

    Page(s): 122 - 128
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (516 KB)  

    The paper describes a novel channel estimation scheme (identified as CD3, coded decision directed demodulation) for coherent demodulation of OFDM (orthogonal frequency division multiplex) signals making use of any constellation format (e.g. QPSK, 16 QAM, 64 QAM). The structure of the CD3-OFDM demodulator is described, based on a new channel estimation loop exploiting the error correction capability of a forward error correction (FEC) decoder and frequency and time domain filtering to mitigate the effects of noise and residual errors. In contrast to the conventional coherent OFDM demodulation schemes, CD3-OFDM does not require the transmission of a comb of pilot tones for channel estimation and equalisation, therefore yielding a significant improvement in spectrum efficiency (typically between 5% and 15%). The performance of the system with QPSK and 64 QAM modulations is analysed by computer simulations, on AWGN and frequency selective channels. The results indicate that CD3-OFDM allows to achieve C/N performance similar to coherent demodulation with pilot tones, when the same channel coding and modulation scheme is adopted. Otherwise, when the additional capacity is exploited to increase the FEC redundancy instead of the useful bit-rate, CD3 can offer significant C/N advantages (typically from 2 to 5 dB depending on the channel characteristics). Therefore CD3-OFDM can be suitable for digital television broadcasting services over selective radio channels View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A new detector for ghosted VIF signals

    Page(s): 53 - 56
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (244 KB)  

    Under multipath conditions, video intermediate frequency (VIF) detectors may generate a local oscillator phase error and consequently produce a dispersed detected signal due to the presence of additional IF carriers. A new detector is presented which by processing the detected phase quadrature information, derives the correct phase for synchronous detection in the presence of multipath effects. This minimises dispersion and produces a detected video signal with the linear addition of amplitude scaled ghosts View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Operational experiences of the digital video cache and its role in the development of the television local area network

    Page(s): 505 - 511
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (388 KB)  

    There have been very rapid developments in the operational use of digital television. The author presents some experiences of using digital storage in practice, and shows how these principles may be applied in the future. Where a station is generating its own productions, the input stages will be studios or outside broadcast facilities. Live events will pass through the system directly to an output cache, being recorded in a very large storage device along the way View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The development of a subscriber management system for the digital age

    Page(s): 426 - 431
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (324 KB)  

    Orbit Satellite Television and Radio Network is a subscription funded direct to home service transmitting to the twenty-three countries throughout the Middle East and North Africa. From Orbit's inception it was realised that to run a subscription based TV and radio company it would be essential to have a fairly sophisticated computer system to handle calls from potential and existing subscribers as well as dealers. To this end a team was established to investigate the current subscriber management systems (SMS) on the market. A telemarketing software tool kit was purchased from BROCK Systems of Atlanta, Georgia. The system is based on a client server architecture working over a wide area network, with operator terminals running under Windows View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The BBC Radio Digital Project-a quest for programme production efficiency

    Page(s): 213 - 218
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (444 KB)  

    The Radio Digital Project was BBC Radio's initiative for matching digital technology to the creative process of programme-making. The objectives of the project were: firstly, to test at least three desktop digital editing systems in order to have real data to find out which was the most suitable for a given programme type; secondly to test whether production efficiency would result from the use of digital editing equipment; and finally to gather some empirical evidence in order to better inform spending decisions across the BBC. This paper will deal with the challenges faced by the project and in particular with the incompatibility problems that were met at almost every level of the production process when introducing the present generation of digital systems. These problems will be examined in relation to the equipment chosen, the technical installations and the methods of data storage and transfer that were adopted. The fundamental difficulties of communication between programme makers and those from outside the broadcasting industry will be assessed, as new technology brings radical change to the sourcing of broadcast equipment. We will also look at the problems of user interface which arise when operational techniques, training and support services are considered View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Noise evaluation of emerging television systems

    Page(s): 1 - 6
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (268 KB)  

    Noise evaluation of television systems takes either a subjective approach, in which the viewing conditions and observer expertise are important, or objectively using noise measuring sets based on sampling areas within the active regions where video information changes little. This is so that the noise components can be uniquely extracted without confusion. The display signal to noise ratio (DSNR) develops the original measurement methods into one which not only can give a single figure of merit, but also a set criteria to define the noise performance of a video source, or the whole TV chain. The important point about the method is that the luminance/chrominance coding/decoding is accommodated, and validity has been verified by objective means View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Simulcast: the EUTELSAT proposal for a smooth transition from analogue to digital TV

    Page(s): 564 - 569
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (320 KB)  

    This paper provides technical guidelines for the design of a Simulcast transmission system based on EUTELSAT's practical experience in implementing the Simulcast technique. The authors show that, with careful design of the system parameters, one digital TV carrier and one FM TV carrier can be transmitted in the same 36 MHz transponder. With transmission of the same programme in both analogue and digital formats, this offers the possibility for a smooth transition from analogue to digital operation at low cost. Other applications, such as digital satellite news gathering, are also possible but must be designed appropriately with care, possibly with the re-optimisation of the symbol and code rates using the flexibility offered by the majority of DVB receivers View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.