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Electrotechnical Conference, 1989. Proceedings. 'Integrating Research, Industry and Education in Energy and Communication Engineering', MELECON '89., Mediterranean

11-13 April 1989

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Displaying Results 1 - 25 of 197
  • Circuit design 2000 AD

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (21 KB)

    Summary form only given. The author addresses key issues in analog circuit design, education, and interactive systems whose resolution can enhance the quality and value of those analog circuits that will be designed at the beginning of the next century. He also speculates upon the nature of the highly interactive design environment within which these circuits will be proposed, synthesized, evaluat... View full abstract»

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  • Discontinuous conduction mode in the SEPIC converter

    Publication Year: 1989, Page(s):38 - 42
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (266 KB)

    The steady-state and dynamic analysis of the SEPIC converter in the discontinuous conduction mode by means of averaging techniques is considered. As a result, similar behavior to that of the Cuk converter was found. It is noted that the results obtained can be used for the optimum design of switching regulators using a SEPIC converter as a power stage.<> View full abstract»

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  • Image coding: Strategies and applications

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (86 KB)

    Summary form only given. Image-compression techniques are analyzed for still images, examining the underlying mathematical background. Particular attention is given to point analysis, block analysis, scanning area analysis, whole analysis, and bilevel images. The extension of these techniques to moving images is studied, the main approaches used are described. Attention is given to intrafield, int... View full abstract»

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  • MELECON '89: Mediterranean Electrotechnical Conference Proceedings. Integrating Research, Industry and Education in Energy and Communication Engineering (Cat. No.89CH2679-9)

    Publication Year: 1989
    Request permission for commercial reuse | |PDF file iconPDF (54 KB)
    Freely Available from IEEE
  • Speaker adaptation for recognition systems with a large vocabulary

    Publication Year: 1989, Page(s):241 - 244
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (276 KB)

    Algorithms for a fast speaker adaptation in a speech-recognition system are described. The techniques aim at transformations of the feature vectors, which have to be optimized with respect to some constraints. The methods transform every feature vector, computed in a 10-ms frame rate, into a speaker-normalized vector. The advantage of adaptation by transforming the feature vectors is that this pro... View full abstract»

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  • A knowledge based approach for automatic labeling of a large speech database

    Publication Year: 1989, Page(s):237 - 240
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (280 KB)

    The authors describe a novel automatic segmentation system based on perceptual cues, spectral dynamics, and various sources of knowledge: heuristic, phonetic, and suprasegmental. Because no reference units are used, the method can be directly applied to speech recognition. The passage from one application to another is facilitated by the modularity and openness given by the backboard model. This m... View full abstract»

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  • A neural network quantizer for long term vocal tract characterization

    Publication Year: 1989, Page(s):233 - 236
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (272 KB)

    The performance obtained using a self-organizing neural network for the vector quantization of the reflection coefficients of a nonstationary lattice is considered. The training of the neural network is effected on a small number of speech patterns of one speaker and subsequently tested on different patterns of the same speaker. The use of a self-organizing neural network for quantizing the parame... View full abstract»

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  • ARES: An environment for speech analysis and labelling

    Publication Year: 1989, Page(s):229 - 232
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (284 KB)

    The ARES (analyze, represent, and elaborate speech) software environment, based on the Tektronix 4125 workstation and VAX 11/750 computer is presented. The sampling procedure makes it possible to store in a RA81 disk up to 6.5 h of speech at a 10 kHz sampling rate. The information related to each utterance is organized in a database. Fundamental characteristics of speech, waveform, power spectrum,... View full abstract»

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  • Torque control of a synchronous motor with field using a state feedback

    Publication Year: 1989, Page(s):161 - 164
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (292 KB)

    It is noted that the introduction of microprocessors in a control loop allows the implementation of new control structures. On the basis of this idea, the authors propose modern regulation techniques for the control of the electromagnetic torque of a synchronous motor. From the state-space representation of systems, they propose the decomposition of the process dynamic into two time scales, in ord... View full abstract»

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  • Adaptive multistage vector quantization

    Publication Year: 1989, Page(s):225 - 228
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (256 KB)

    The authors present a novel multiple-stage vector-quantization method that allows the adaptation of the quantizer to the signal to be coded. This adaptation is computationally very simple and is made with no increase in bit rate. The resulting quantizer provides a robust performance across different speakers and environments. It has been applied to the quantization of the LPC parameters, and the r... View full abstract»

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  • Travelling waves methods for the calculation of electrical transients-an efficient computational algorithm of Bewley's method

    Publication Year: 1989, Page(s):159, 155 - 156
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (144 KB)

    The versatility of Bewley's method for the calculation of transient currents and voltages using personal computers is shown. The computer time and storage required are relatively small. SOBBE program is shown to be an efficient program for the study of transient phenomena of medium-size power system networks. Numerical results are presented View full abstract»

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  • M/M/m modelling of access delay to X.25 virtual circuits

    Publication Year: 1989, Page(s):417 - 420
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (216 KB)

    An effort is made to analyze the admission delay of an X.25 connection, modeling the virtual circuit as an equivalent server with parameters related to the behaviour measurable by the X.25 user. The authors review M. Reiser's (1978) mean value analysis of a virtual circuit with window flow control, Norton's theorem is used to obtain an equivalent server allowing the evaluation of the X.25 admissio... View full abstract»

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  • A comparative study of alternative methods for FDDI and ISDN environments interconnection

    Publication Year: 1989, Page(s):666 - 669
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (272 KB)

    The authors present a comparative study of alternative methods for interconnection of FDDI (fiber distributed data interface) networks with ISDN environments. The methods studied include the connection between FDDI and a PBX with ISDN services via a gateway, and direct connection between FDDI and a CCITT standardized ISDN interface with the call setup and switching functions performed either outsi... View full abstract»

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  • A multiple user variable rate speech coding for packet transmission systems

    Publication Year: 1989, Page(s):221 - 224
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (216 KB)

    In an effort to reduce queuing delay and increase the number of channels in a given bandwidth, a multiple-user variable-rate hybrid constant factor incremental data modulator is presented. The proposed system has a statistical multiplexing scheme incorporated with a packet transmission concept. Only the speech is encoded, while the silence portions are transmitted in header bits of each packet gen... View full abstract»

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  • Tracking techniques for rotor position control of induction motors

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (144 KB)

    A novel application of quadratic tracking techniques to speed and rotor position control of induction motor drives is introduced. These methods can adaptively adjust the motor speed and/or current to follow certain desired tracks. The tracking performances of the induction machine with these control methods are illustrated through a variety of computer simulations. It is shown that the suboptimal ... View full abstract»

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  • The Pseudo-Star LAN as an intelligent Starlan hub

    Publication Year: 1989, Page(s):414 - 416
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (164 KB)

    The Pseudo-Star LAN (local area network) is presented as a bridge implementing the IEEE 802.3 10BASE5 standard. It can be characterized as an intelligent Starlan hub, permitting immediate connection to the Pseudo-Star of a great number of users; throughput between the end users is quite high because each user has all the capacity of the Starlan channel available (1 Mb/s), with the additional featu... View full abstract»

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  • SITRAL: an integrated telephony service over a local area network

    Publication Year: 1989, Page(s):662 - 665
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (280 KB)

    The authors describe and examine the implementation of SITRAL (Servicio Integrado de Telefonia sobre Red de Area Local), a telephony service over an Ethernet local area network, integrating voice and data and providing both the call control procedures and the packetized voice channels on the nodes of the network for internal calls and access to the public network. The different elements of the voi... View full abstract»

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  • Reliability and economic assessment of generating systems containing hydro energy resources

    Publication Year: 1989, Page(s):83 - 86
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (248 KB)

    An efficient technique to simulate the operation of hydro power plants with random energy is presented. It is noted that the reliability and economic assessment of such sources cannot be made using standard capacity-replacement-based methods; instead, energy-replacement methods are required. The author extends probabilistic production simulation to include hydro sources in the evaluation of genera... View full abstract»

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  • High quality mid-rate speech coding

    Publication Year: 1989, Page(s):217 - 220
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (320 KB)

    The authors present the results of a feasibility study comparing two basic classes of coders in the mid-rate range (6-8 kbps): CELP and sinusoid based coders. It is concluded that CELP coding is a mature technique able to yield high-quality synthetic speech with some background noise at the mid-rate range. It has a tractable computational complexity and good robustness, making it the best present ... View full abstract»

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  • A two level hierarchical classifier for online transient stability assessment

    Publication Year: 1989, Page(s):150 - 153
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (488 KB)

    The authors present a novel automatic transient stability classification approach, based on a two-stage hierarchical classifier obtained through the combination of two different pattern recognition structures. The first-level classifier uses low-cost computational variables evaluated at the fault occurrence moment. The classification structure used in this first level is a linear one and is obtain... View full abstract»

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  • An application of the nonlinear stochastic estimation theory to the interference reduction in communication systems

    Publication Year: 1989, Page(s):445 - 448
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (200 KB)

    An application of the nonlinear stochastic estimation theory to the problem of interference reduction among communication systems is analyzed. A significant overlapping of the spectra of the desired and interfering signals is assumed. The solution obtained takes the form of an extended Kalman filter. For such a solution some a priori data are needed, e.g. spectra and modulation techniques of the s... View full abstract»

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  • Private accounting system for X.25 host

    Publication Year: 1989, Page(s):411 - 413
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (172 KB)

    The general and package characteristics of a private accounting system for the X.25 host are described. The objective is to record the contribution of each user in the final bill with TELEFONICA SA, Spain's PTT. As the LAN has several hosts with distant operating systems which have access to the X.25 net, the decision was made to build software thinking into the operating system; in this way this ... View full abstract»

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  • An OSI compatible architecture for integrated multichannel metropolitan and regional networks

    Publication Year: 1989, Page(s):639 - 643
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (344 KB)

    An OSI (open systems interconnection) compatible architecture for a multichannel integrated network is defined. The OSI layers considered are the lowest three because the network structure affects only these layers. The authors analyze the services to be provided by each layer and derive the related primitives. Some of these primitives are the same as in a conventional network, while new primitive... View full abstract»

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  • Theoretical and experimental characterization of integrated millimeter wave structures

    Publication Year: 1989, Page(s):710 - 713
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (232 KB)

    A rigorous theoretical approach is used to characterize quasi-planar transmission lines for millimeter-wave applications. The method takes into account the finite metallization thickness and the presence of grooves for holding the substrate into the housing. An experimental method that allows the characterization of the structures in terms of dominant and higher order modes by a single broadband t... View full abstract»

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  • A new protocol for the integration of voice and data on LAN

    Publication Year: 1989, Page(s):658 - 661
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (252 KB)

    The authors present a new deterministic protocol for the integration of voice and data on a LAN (local area network) with a bus topology. This protocol implements the movable boundary strategy and is modeled analytically according to this scheme. This model is then used for a performance evaluation. After a brief description of the deterministic media access method for a voice and data stations, a... View full abstract»

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