Showing papers in "IEEE Transactions on Consumer Electronics in 1979"
TL;DR: By utilising theteletext system to broadcast programs for such a terminal, a user needs only to select the teletext pages containing a desired program; once this has been read in, it may be loaded and executed by the terminal microprocessor without the need for expensive-storage peripherals, telephone lines or special knowledge by the user.
Abstract: Broadcast teletext, as operated by the broadcasting authoriities in the UK has been available as a public service since 1974. As well as being an efficient means of decoding and displaying textual data, it was soon realised that the standard teletext decoder already contained many of the components required for a home computer: it has a character-generator for visual- display; a page-store, and a very convenient numeric keypad for data-entry. With the addition of a few other components, the result is quite a powerful stand-alone computer right inside the TV set. By utilising the teletext system to broadcast programs for such a terminal, a user needs only to select the teletext pages containing a desired program; once this has been read in, it may be loaded and executed by the terminal microprocessor without the need for expensive-storage peripherals, telephone lines or special knowledge by the user.
75 citations
TL;DR: A tutorial on selected aspects of the ghost cancelling problem is presented and insights into theoretical and practical constraints are provided.
Abstract: A tutorial on selected aspects of the ghost cancelling problem is presented. Insights into theoretical and practical constraints are provided. The nature of the problem and acceptable solutions are discussed. Basic approaches, detection methods, hardware requirements, baseband cancelling techniques, frequency domain and time domain algorithms, test signals, and signal format limitations are covered.
70 citations
TL;DR: The KSL-TV and Bonneville International Corporation feel that the standards that will be set for the United States must be U.S. standards, which are now being considered, and existing systems are being compared.
Abstract: If we were to ask people what electronic device found in the home is used an average of at least three hours a day and can provide both entertainment and news, the answer would have to be the television. At KSL-TV this month, we are celebrating our 30th Anniversary. Since our beginning, we have seen television develop and grow and become a big part of each home. We saw the need for expanding this information source in the home, and therefore, in June of 1978, KSL-TV became the first to transmit Teletext for test purposes in the United States. Teletext has proven to be a popular topic among many different groups of people as evidenced by the steady stream of people to Salt Lake City to see our system. U.S. standards are now being considered, and existing systems are being compared. The United States is in a unique and very favorable position. We currently have no Teletext-equipped sets out on the market, and yet we have more advanced technology available than is used in existing systems. We at KSL and Bonneville International Corporation feel that the standards that will be set for the United States must be
25 citations
TL;DR: The development of teletext started in the UK in the early 1970's after investigation into methods of broadcasting subtitles and progressed to a full public teletext service starting in November 1976, influenced by the fundamental requirements of a practical data broadcasting service.
Abstract: The development of teletext started in the UK in the early 1970's after investigation into methods of broadcasting subtitles. It was clear that it would soon be economic to build, into every television receiver, LSI circuitry to decode and to display data transmitted during the blanking intervals of the broadcast television signal. Extensive research by the BBC, the IBA and members of BREMA* led to agreement on a unified UK standard for teletext in 1974 and, after a 2 year trial, to a full public teletext service starting in November 1976.1 ,2 The evolution of this UK standard was influenced by the fundamental requirements of a practical data broadcasting service: (1) the service should provide a comprehensive range of information attractively presented, (2) access time, the delay between the viewer selecting a page and the first reception of that page,should be acceptably small, (3) data transmission should be compatible with the normal distribution network, it should have as large a service area as the colour television signal, and should not interfere with normal reception of colour television programmes,3'4 (4) the display should be easily read, (5) transmission errors should have minimnum subjective effect, (6) receivers should be low cost, (7) future options both for transmission and reception should be considered.
19 citations
TL;DR: This paper is proposed to explore the extension of the UK Viewdata and Teletext systems primarily into the USA but also to Europe, and to recognise the basic starting points.
Abstract: In this paper it is proposed to explore the extension of the UK Viewdata and Teletext systems primarily into the USA but also to Europe. The paper is complementary to the paper by N. E. Tanton, BBC, entitled 'UK Teletext ?Evolution and Potential'. In adapting and extending an existing system it is worth recognising the basic starting points. For the UK Teletext and Viewdata systems these can be summed up as follows: 1) decoder costs, 2) ease of use by the end user.
17 citations
17 citations
TL;DR: Color Picture Tube electron gun designers were faced with a new challenge when two industry-wide trends started in 1972, and the development of the self-convergence precision inline (PI) system to replace the conventional delta gun structure in 90°small size tubesl and the large size 110°self-conversgence PI system2.
Abstract: Color Picture Tube electron gun designers were faced with a new challenge when two industry-wide trends started in 1972. They were: a) the development of the self-convergence precision inline (PI) system to replace the conventional delta gun structure in 90°small size tubesl and b) the development of the large size 110°self-convergence PI system2. In both these cases, the neck diameter was reduced from 36 mm to 29 mm and the diameter of the main lens was reduced from 8.9 mm to 4.1 mm initially and 5.4 mm later, to a final 39 percent reduction (Figure 1).
17 citations
TL;DR: TELE-BRIEFS is a News (Wire-Services) CATV System compatible with existing headend systems and conventional home TV sets.
Abstract: TELE-BRIEFS is a News (Wire-Services) CATV System compatible with existing headend systems and conventional home TV sets.
17 citations
TL;DR: The Picture in Picture (P in P) TV system can be provided by putting a small, inset-monitor picture (subpicture) along with the standard picture (main picture).
Abstract: One can keep an eye on a television program while watching another program on a screen. This Picture in Picture (P in P) TV system can be provided by putting a small, inset-monitor picture (subpicture) along with the standard picture (main picture).
15 citations
TL;DR: In this paper, an adaptive transversal filter is proposed to cancel diffused multiple ghosts, generated by complex transmission path irregularities, which can not be achieved by a single-delay-line ghost cancellation.
Abstract: Among various approaches for realizing a practical ghost canceller, the one based on an adaptive transversal filter has recently been studied most enthusiastically.(1) ~(3) The inherent merit of this approach lies in the fact that it can cancel diffused multiple ghosts, generated by complex transmission path irregularities. This feature can not be attained by a single-delay-line ghost canceller.
14 citations
TL;DR: This paper is written as an introduction to teletext and viewdata for readers, with limited exposure to these topics, to the Special Issue of the IEEE Transactions on Consumer Electronics devoted to Consumer Text Display Systems.
Abstract: This paper is written in two parts. Part I is intended to be an introduction to teletext and viewdata for readers, with limited exposure to these topics. Part I also serves as an introduction to the Special Issue of the IEEE Transactions on Consumer Electronics devoted to Consumer Text Display Systems.
TL;DR: Using computer simulation, the transmitted signal and encoded teletext data (as defined in Broadcast Teletext Specifications') will be examined for different multipath conditions.
Abstract: Information for data broadcasting services such as Teletext is transmitted as digital signals inserted in the vertical interval of the television video waveform. The specifications for these signals are drawn very carefully to ensure compatibility with the existing television system. This paper examines some of these specifications such as data rate and waveform shape, which must be selected to maintain the spectral energy within the television bandwidth. Using computer simulation, the transmitted signal and encoded teletext data (as defined in Broadcast Teletext Specifications') will be examined for different multipath conditions. For all these experiments, echoes have been generated and evaluated at the baseband, ignoring system amplitude and group delay characteristics. These, in general, will have additional influence on decoding reliability.
TL;DR: Home VTR is gradually attaining a phase of definitive diffusion, and concurrently, a further size and weight reduction, multi-functions and, higher performance are being demanded, in parallel with a large cost reduction and improved reliability.
Abstract: Home VTR is gradually attaining a phase of definitive diffusion, and concurrently, a further size and weight reduction, multi-functions and, higher performance are being demanded, in parallel with a large cost reduction and improved reliability.
TL;DR: Teletext and Viewdata are the generic names for two basically similar systems for displaying pages or frames of useful information on the screen of a domestic television set.
Abstract: Teletext and Viewdata are the generic names for two basically similar systems for displaying pages or frames of useful information on the screen of a domestic television set
TL;DR: The decoders presently manufactured in France contain a character generator with 254 shapes including all Latin and Cyrillic characters used in CEPT and EBU countries.
Abstract: Character sets The character sets used are composed of an aphabetic part and a mosaics part. The mosaics part is composed of twice 64 characters. Provisions are made in the coding to allow other latin languages to be used (see coding below). The decoders presently manufactured in France contain a character generator with 254 shapes including all Latin and Cyrillic characters used in CEPT and EBU countries.
[...]
TL;DR: Achieving an attractive display quality, a comprehensive set of features, a large local storage capability and yet offer the potential for consumer applications has been the challenge faced when defining the ANTIOPE system structure and LSI partitioning.
Abstract: Achieving an attractive display quality, a comprehensive set of features, a large local storage capability and yet offer the potential for consumer applications has been the challenge faced when defining the ANTIOPE system structure and LSI partitioning.
TL;DR: Television multiplex broadcast has caught worldwide interest as a new information media and is likely to continue to do so.
Abstract: Television multiplex broadcast has caught worldwide interest as a new information media.
TL;DR: A recently developed two integrated circuit speech synthesis system represents a significant advance in large scale integration in both random logic and data storage functions.
Abstract: A recently : developed two integrated circuit speech synthesis system represents a significant advance in large scale integration in both random logic and data storage functions.
TL;DR: In this article, the authors used the variation principle to calculate the deflection magnetic field of a saddle-shaped magnetic deflection coil with an iron core, and used this calculation method to determine the electron beam trajectory.
Abstract: The practical calculation method for the magnetic field analysis of a saddle-shaped magnetic deflection coil with an iron core has already been reported. The authors used this calculation method to determine the deflection magnetic field. Further, by numerically solving the equation which was derived from the variation principle, the authors developed the program which determined the electron beam trajectory. By using this method, the deflection characteristics can be learned by using only the numerical values which show the physical position and the shape of the picture tube and deflection coils. In the past, the deflection system design was based on experience, but now it will be possible to depend upon theoretical analysis.
TL;DR: This paper describes both the conceptual and international aspects of viewdata as well as summarising specific details of the Prestel service now embarked upon in the United Kingdom.
Abstract: It should be explained that the name Prestel* has been adopted by the British Post Office as the trade name for its development of viewdata. This paper describes both the conceptual and international aspects of viewdata as well as summarising specific details of the Prestel service now embarked upon in the United Kingdom.
TL;DR: Following the introduction of an experimental Telextext service by Independent Television in June 1975, the Independent Broadcasting Authority initiated an extensive programme of field survey work as mentioned in this paper, which was later extended to a series of field surveys.
Abstract: Following the introduction of an experimental Telextext service by Independent Television in June 1975, the Independent Broadcasting Authority initiated an extensive programme of field survey work.
TL;DR: In this article, the potential applications for a data processing terminal in the home are identified and discussed and consideration is given to the likely start-up mechanisms for commercial services which will support these terminals.
Abstract: Possible applications for a data processing terminal in the home are identified and discussed. Consideration is given to the likely start-up mechanisms for commercial services which will support these terminals. The 1977-78 status quo services which are likely to evolve into mass market consumer services are also identified and discussed.
TL;DR: In this paper, the relation between the spot size and the spherical aberration of electron lenses was considered and a color picture tube was proposed to solve the problem of "blooming" at higher currents.
Abstract: Conventional color picture tubes suffer the drawback of "blooming", i. e. reduction of the resolution at higher currents. It is well-known that such problem cannot be solved without considering the relation between the spot size and the spherical aberration of electron lenses.
TL;DR: Digital tuning systems are fast replacing the conventional mechanical systems in AM/FM and television receivers with the desirability of the digital approach mainly due to the following operational features.
Abstract: Digital tuning systems are fast replacing the conventional mechanical systems in AM/FM and television receivers The desirability of the digital approach is mainly due to the following operational features: *Precise tuning of station frequencies *Exact digital frequency display *Keyboard entry of desired frequency *Virtually unlimited station memory *Up/down scanning through the band *Station "search" (stop on next active station) *Power on to the last station *Easy option for time-of-day clock
TL;DR: The ability of consumers to access computer- stored general information is much further advanced in theUnited Kingdom than in the United States because of the strong promotion of the teletext, viewdata and viewdata concepts by the British Broadcasting Corporation and British Post Office.
Abstract: The ability of consumers to access computer- stored general information is much further advanced in the United Kingdom than in the United States. This is largely . a result of the strong promotion of the teletext1,2 and viewdata3,4 concepts by the British Broadcasting Corporation and British Post Office, respectively. These strong government programs have resulted in the establishment of transmission and display standards, first for teletext and later for viewdata. The earlier availability of teletext resulted in most viewdata systems being designed as add-on elements to the teletext system, placing a burden on systems made to provide only viewdata service. The British and French governments may require the incorporation of teletext capability in all TV receivers in a few years.
TL;DR: In this paper, the authors tried to apply to the television the proceedinga currently used for three disensional photographies or movies, but such solutions cannot work if, at the broadcasting center and at the receiver aet, a cathodic scanning is used, only because such a scan requires, on the TV-receiver, a strictly identical picture than the broadcasted one.
Abstract: Many authors tried to apply to the television the proceedinga currently used for three disensional photographies or movies. The Mitsubishi patent which discloses meane for applying to the television the proceedings used for Lipmann integral photography, can be quoted. But such solutions cannot work if, at the broadcasting center and at the receiver aet, a cathodic scanning is used, only because such a scan requires, on the TV-receiver, a strictly identical picture than the broadcasted one.
TL;DR: The paper deals with a principially new linear technique applicable to virtually every field of linear or digital electronics where the necessity of processing the frequency of a given signal occurs.
Abstract: The paper deals with a principially new linear technique applicable to virtually every field of linear or digital electronics where the necessity of processing the frequency of a given signal occurs. On the example of the first integrated device utilizing the 'Frequency Processing Technique' authors illustrate the methods of precise lineararization of tuning characteristics of a number of voltage/current controlled oscillators and securing extremely high frequency stability of such oscillators. The principle of operation of the 'Frequency Locked Loop' (FLL) is described and the methods of development of tracking error-free tuners shown.
TL;DR: In this article, the authors describe the use of computer modeling for the design and analysis of electron guns for cathode ray tubes (CRSTs). But, the main disadvantage of computer analysis is the interpretation of results, which is at best tedious.
Abstract: Recent years have seen continued growth in the application of computer modeling to design and analysis of electron guns for cathode ray tubes. This has been especially true with the advent of self converging deflection systems in color cathode-ray-tube technology, where increasing emphasis has been placed on the interaction of the electron gun and deflection field. Computer modeling allows a rigorous analysis of an entire system including inspection of the various properties of the electron spot and deflection field which lead to deflected spot distortion. A disadvantage of a computer analysis, the outputs of which are generally numerical, has been interpretation of results. Since the spot distortions are generally non-symmetrical, analysis and comparison of the vast numerical descriptions are at best tedious.
TL;DR: The major present television standards are 625/50 and 525/60 for scanning systems, and NTSC, PAL and SECAM for color systems for video tape cassettes.
Abstract: Video tape cassettes have become popular in the consumer market in recent years. With growth in international communications, television standards version is highly desirable. The major present television standards are 625/50 and 525/60 for scanning systems, and NTSC, PAL and SECAM for color systems (Table 1). Both systems are in concurrent use in the Middle East as well as for closed circuit video.