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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： A. Erell Y. Orgad J.L. Goldstein Department of Electronic Communication Control and Computer Systems Faculty of Engineering Tel-Aviv University Israel

The most straightforward way to incorporate knowledge of formant perception in LPC scalar quantization is by quantizing the LPC poles. The authors measured directly the perceptual sensitivity to changes in the poles during continuous speech, and used these data in the design of a scalar quantization scheme. The average pole-frequency just noticeable difference (JND) was found to strongly decrease with increasing formant bandwidth, and to depend to a lesser degree on the frequency. A considerable coding efficiency was achieved by utilizing the JND data and the measured distribution ranges of the pole frequencies. A 30 bits per frame quantization produced similar speech quality as that obtained with a standard 41 bits quantization of the reflection coefficients.< >

关键词： Psychology Quantization Linear predictive coding Frequency Bandwidth Testing Speech analysis Communication system control Knowledge engineering Bit rate

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computerized intonator: design of a microprocessor pitch-aid

Computerized intonator: design of a microprocessor pitch-aid

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： C. Yehezkel M. Furst J.L. Goldstein Department of Electronic Communication Control and Computer Systems Faculty of Engineering Tel-Aviv University Ramat-Aviv Israel

Many profoundly hearing-impaired individuals that use hearing-aid devices suffer from poor auditory capacity, and therefore mainly rely on speechreading information. Previous studies suggest that presenting signals carrying prosodic information has great potential for improving speechreading. The authors present the computerized intonator, which is a microprogrammed acoustic pitch-aid device that provides the user in real-time with the fundamental frequency modulated by the amplitude envelope. The device implementation provides maximum flexibility for designing the output stimuli to suit individual needs. The benefit of the device is presently being evaluated using the connected discourse tracking test.< >

关键词： Microprocessors Signal processing algorithms Speech Auditory system Acoustic devices Frequency Testing Data mining Decoding Performance evaluation

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On-line Fault Detection in Adaptive control systems by Using Kullback Discrimination Index

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IFAC Proceedings Volumes 1988年第9期21卷 1135-1140页

作者： K. Kumamaru T. Söerström S. Sagara K. Morita Department of Computer Science and Communication Engineering Faculty of Engineering Kyushu University Fukuoka 812 Japan Department of Automatic Control and Systems Analysis Institute of Technology Uppsala University P.O. Box 534. Uppsala Sweden Department of Electrical Engineering Faculty of Engineering Kyushu University Fukuoka 812 Japan

An on-line scheme to fault detection in adaptive control systems is proposed by introducing Kullbaek Discrimination Information (KDI) as a detection index. When a physical parameter change due to a failure has occurred in a system under adaptive control, the failure effect will hardly be visible in the output performance because of the adaptation mechanism. Such a parameter change is also difficult to detect by monitoring the regulator parameters, which are determined by a recursive identification based on the direct approach. Since the failure effect is reflected as a change in the predictor model used for the adaptive control design, the fault detection leads to a model discrimination problem. It has been shown that the KDI can be used as an effective distortion measure for the model discrimination and the index can be applied in a modified form to detect a fault on-line. Simulation studies on a second order damped oscillatory system have been carried out to demonstrate the efficiency of the method.

关键词： Adaptive control fault detection Kullback discrimination information model discrimination parameter estimation

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Frequency Domain Conditions for the Robust Stability of Linear and Nonlinear Dynamical systems

Frequency Domain Conditions for the Robust Stability of Line...

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American control Conference (ACC)

作者： S. Dasgupta P.J. Parker B.D.O. Anderson F.J. Kraus M. Mansour Department of Electrical and Computer Engineering University of Iowa Iowa IA USA Department of Systems Engineering Australian National University ACT Australia Department of Automatic Control and Industrial Engineering Swiss Federal Institute of Technology Zurich Switzerland

This paper presents general frequency domain criteria for the robust stability of systems with parametric uncertainities. The criteria are applied to the robust stability verification of LTI systems with or without ti... 详细信息

关键词： Frequency domain analysis Robust stability Nonlinear dynamical systems Polynomials Differential equations Feedback Delay effects Adaptive control Cities and towns systems engineering and theory

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A power method for the structured singular value

A power method for the structured singular value

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IEEE Conference on Decision and control

作者： A. Packard M.K.H. Fan J. Doyle Systems and Control Sciences Honeywell Systems and Research Center Inc. Minneapolis MN USA Department of Electrical and Computer Engineering University of California Santa Barbara CA USA Department of Electrical Engineering & Systems Research Center University of Maryland College Park MD USA Department of Electrical Engineering Pasadena CA USA

An iterative algorithm is presented to compute lower bounds for the structured singular value ( mu ). The algorithm resembles a mixture of power methods for eigenvalues and singular values, since the structured singular value can be viewed as a generalization of both. If the algorithm converges, a lower bound for mu results. The authors prove that mu is always an equilibrium point of the algorithm. However, since in general there are many equilibrium points, some heuristic ideas to achieve convergence are presented. Extensive numerical experience with the algorithm is discussed.< >

关键词： Iterative algorithms Eigenvalues and eigenfunctions Convergence Upper bound Yield estimation Performance analysis Robustness Uncertainty control systems Educational institutions

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Benchmark Problems for computer-Aided control System Design

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IFAC Proceedings Volumes 1988年第8期21卷 1-6页

作者： D.K. Frederick M. Rimer Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute Troy 12180 USA Stability Control and Flying Qualities Group B21-35 Grumman Aerospace Corporation Bethpage 11714 USA

The need for having benchmark problems for the evaluation of software for computer-aided control system analysis and design is discussed. The two benchmark problems that have been released to date by the Benchmark Working Group of the Technical Committee on computer-aided control System Design of the IEEE control systems Society are described, as are the plans for future problems. Information that has been learned about the preparation, distribution, and dissemination of results for this type of problem is included.

关键词： computer-aided design benchmark problems computer analysis computer programs control-system design

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An Integrated Approach to controls and Diagnostics: The 4-Parameter controller

An Integrated Approach to Controls and Diagnostics: The 4-Pa...

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American control Conference (ACC)

作者： C. N. Nett C. A. Jacobson A. T. Miller Control Systems Laboratory GE Corporate Research and Development Center Schenectady NY USA Department of Electrical and Computer Engineering Northeastern University Boston MA USA

In this paper we present a theoretical basis for an integrated approach to the design of reliable control systems. In this approach, the control and diagnostic modules of a reliable control system are designed together, instead of independently, thereby accounting for the interactions which occur between these two modules in a functioning reliable control system. The approach makes use of a significant generalisation of the familiar 2-parameter controller known as the 4-parameter controller. This controller has two vector inputs and not one, but two vector outputs; correspondingly, this controller is comprised of not two, but four matrix parameters. The additional controller output is monitored to detect and isolate sensor and actuator faults, thereby providing the controller with diagnostic capabilities, or "intelligence," in addition to its control capabilities. Using a parameterization of all stabilising 4-parameter controllers, the fundamental limitations and inherent tradeoffs governing the design of reliable control systems are clarly delineated, with special attention given the issues of uncertainty and control/diagnostic interaction. Several means for resolving these desig tradeoffs are proposed, and illustrated by way of non-trivial examples. These results are expected to pave the way for the achievement of improved overall control/dignostic performance in reliable control systems, and also to pave the way for the achivement of significant complexity reductions in both the design and implementation of reliable control systems.

关键词： control systems Fault detection Signal processing Research and development Jacobian matrices Reliability theory Monitoring Actuators Uncertainty Intelligent control

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Statistical Analysis of the Overdetermined Yule-walker Estimator of Frequencies of Multiple Sinusoids

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IFAC Proceedings Volumes 1988年第9期21卷 1035-1040页

作者： P. Stoica T. Soderstrom F.-N. Ti B. Friedlander Department of Automatic Control Polytechnic Institute of Bucharest Splaiul Independentei 313 R-77206 Bucharest Romania Automatic Control and Systems Analysis Group Department of Technology Uppsala University P.O. Box 534 S-751 21 Uppsala Sweden Automatic Control and Systems Analysis Group Department of Technology Uppsala University P.O. Box 534 S-751 21 Uppsala Sweden on leave from Department of Mechanical and Electrical Engineering Shandong College of Light Industry Jinan PRC Saxpy Computer Corporation 255 San Geronimo Way Sunnyvale CA 94086 USA

The estimation of sinusoidal frequencies by the overdetermined Yule-Walker (OYW) Method is considered. An explicit expression is derived for the asymptotic covariance matrix of the estimation errors. The effect of increasing the number of Yule-Walker equations on estimation accuracy is analyzed. The asymptotic estimation accuracy of the OYW method is compared to the best achievable accuracy corresponding to the Cramér-Rao bound

关键词： system identification parameter estimation sinusoidal frequencies Yule-Walker methods asymptotic distribution

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NTDS - A PAGE IN NAVAL HISTORY

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NAVAL ENGINEERS JOURNAL 1988年第3期100卷 53-61页

作者： SWENSON, EN MAHINSKE, EB STOUTENBURGH, JS Capt. Erick N. Swenson USNR (Ret.):is a project manager for special projects in the Surface Ship Systems Division Hughes Aircraft Company Fullerton Calif where he has been employed since his retirement from the U.S. Navy in 1975. Originally trained as an electronics technician during WWII in the Captain Eddy program he later received a BS degree in electrical engineering from the University of Rochester Rochester N. Y. in 1950. Subsequent engineering education was received at the University of Pittsburgh Pittsburgh Penn. and the Naval Postgraduate School Monterey Calif. After commissioning he was ordered to duty as the electronics division officer on the USSMissouri(BB-63) and electronics ships superintendent at Hunters Point Naval Shipyard San Francisco Calif. When the design of the Naval Tactical Data System began in the mid-1950s Lt. (j.g.) Swenson was ordered to the Bureau of Ships Navy Department Washington D.C. as the junior engineering duty only officer assigned to the project. From 1962 to 1965 LCdr. Swenson was assigned as the BuShips technical representative on the program at Remington Rand Univac St. Paul Minn. For the next ten years he returned to BuShips/NavSea/NAVSEC as the NTDS project officer. During this time the project expanded considerably foreign military sales were heavily involved and interoperability with other services and countries were established. His final effort on active duty was to instigate the redesign of the previousSpruanceclass destroyers into the newerAdmiral Kiddclass improvement program. He is a registered professional electrical engineer in the State of California listed inWho's Who in the Worldis a life member of ASNE and chairman of the Long Beach/Greater LA Section. Capt. Edmund B. Mahinske USN (Ret.):is an alumnus of the U.S. Naval Academy the Massachusetts Institute of Technology and the Harvard Business School. His technical background is in electronics and he specialized in the management of programs involving the application of comp

A little over thirty years ago, a group of naval engineers were assembled by the Bureau of Ships to develop a new system approach to the combat information center (CIC). The CIC of World War II, with its “grease pencil” plots and voice telling of tactical information from sensors and other ships, could no longer provide the timely, coordinated reaction to postwar threats. This project group led the Navy into the new world of large-scale, high-speed digital electronics and into a new mode of conducting naval warfare as well. There were no off-the-shelf computers of the requisite capability, size and reliability; what were available were monstrous vacuum tube computers. There were no display equipments that were “conversant” in both the digital language of the computer and the analog language of the sensors and the weapon systems. Who ever heard, at that time, of a computer running a tactical communication net automatically? It was hard enough to find sufficient numbers of engineers who knew what a digital computer was. This paper, by three naval engineers in the implementing engineering office, depicts the evolvement of the Naval Tactical Data systems (NTDS) as they saw it. It discusses the problems that stemmed from the transition from the old world of analog into the new digital world, the system concepts that steered the development; the key decisions that were made; new electronic equipment and processes that became necessary; and the need of the mangagement to face the real world of deadlines, ship schedules and operational requirements.

关键词： NAVAL WARFARE

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OPTIMUM HVAC-TRANSMISSION EXPANSION PLANNING

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INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY systems 1987年第1期9卷 29-44页

作者： GILLES, ML MEISEL, J Systems Control Inc. 1801 Page Mill Road Palo Alto CA 94303 USA Department of Electrical and Computer Engineering Wayne State University Detroit MI 48202 USA

A new, flexible, mixed-integer formulation is presented for solving the single-stage AC-transmission expansion planning problem. This new formulation handles the discrete nature of equipment additions without resorting to linearized incremental approaches, but still uses integer linear programming. Even the interconnection of an initially disjoint system is handled directly without resorting to an arbitrary initially connected system. The optimal configuration at the end of the planning step under consideration minimizes an annually amortized cost function including the investment cost for equipment additions and the operating cost in terms of real-power transmission losses. Using a new, efficient, linear load-flow model, the formulation developed here is characterized by a complete decoupling between real and reactive equations. Examples have been incorporated to illustrate the potentials of this new optimum planning formulation. A major contribution of this paper is in showing how the power system transmission expansion planning problem can fit into the standard, mixed-integer, linear programming format in both a conventional sensitivity formulation and also with our new implicit enumeration formulation.

关键词： expansion planning generation expansion transmission expansion

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