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

作者： P.J. Loughlin J.W. Pitton L.E. Atlas Interactive Systems Design Laboratory Department of Electrical Engineering FT-10 University of Washington Seattle WA USA

Two properties are presented that constrain the cross-terms of Cohen-class time-frequency representations (TFRs) to appear only at signal frequencies, and only when the signal is nonzero. These properties thus guarantee strong finite support, i.e. the TFR is zero everywhere the signal or its spectrum is zero. When combined with cross-term attenuation, one can obtain TFRs with spectrogram-like interference suppression, but without the inherent time-frequency resolution tradeoff of the spectrogram.< >

关键词： Time frequency analysis Interference constraints Attenuation Spectrogram Fourier transforms Interactive systems Signal design Laboratories Interference suppression Signal resolution

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Truly nonstationary techniques for the analysis and display of voiced speech

Truly nonstationary techniques for the analysis and display ...

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

作者： L.E. Atlas P.J. Loughlin J.W. Pitton Interactive Systems Design Laboratory Department of Electrical Engineering FT-IO University of Washington Sacramento WA USA

The assumption of quasi-stationarity in the analysis of speech is questioned from the standpoint of the best resolution of global periodicity and vocal tract formant frequency locations. The generalized class of time-frequency representations is discussed from the standpoint of speech analysis and is integrated with a description of the spectrogram. The spectrogram is known to have minimal interference artifacts, and the truly nonstationary cone-kernel time-frequency representation (CK-TFR) is shown to be similarly free of interference. The CK-TFR is observed to give higher resolution of the time point of glottal closure, and the clarity of some formant frequencies, especially for a nasal consonant, is shown to be better than the spectrogram. It is shown that interference-free representations of speech with a higher simultaneous resolution in time and frequency than the spectrogram are possible, and that these new representations may be applicable to the better analysis and understanding of speech.< >

关键词： Speech analysis Displays Spectrogram Interference Time frequency analysis Interactive systems Laboratories Signal analysis Signal resolution Speech recognition

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Efficient test generation for built-in self-test boundary-scan template

Efficient test generation for built-in self-test boundary-sc...

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1991 IEEE VLSI Test Symposium: Chip-to-System Test Concerns for the 90''s, VTEST 1991

作者： Nagvajara, P. Karpovsky, M.G. Levitin, L.B. Dept. of Electr. and Comput. Eng. Drexel Univ. PhiladelphiaPA United States Research Laboratory for Design and Testing of Computer and Communication Systems Department of Electrical Computer and System Engineering Boston University United States

An analysis and design of a pseudorandom pattern generator, (PRPG), based on a linear recurrence, for built-in self-test (BIST) boundary scan design is presented. The authors present for the case when r≥s, a design of an s-stage PRPG capable of producing 2s-1 distinct r-bit patterns within 2s-1 clock pulses independent of the hardware realization of the PRPG. For the case when rr distinct r-bit patterns and the expected number T(N) of distinct patterns given a number N of clock pulses were presented. The proposed theoretical average N(T) was shown to be close to the experimental average values Nex(T). Hence, the value N(T) or T(N) can be used as a benchmark for evaluating the efficiency of a BIST boundary scan test generation. © 1991 IEEE.

关键词： Built-in self test

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Efficient test generation for built-in self-test boundary-scan template

Efficient test generation for built-in self-test boundary-sc...

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VLSI Test Symposium

作者： P. Nagvajara M.G. Karpovsky L.B. Levitin Department of Electrical and Computer Engineering Drexel University Philadelphia PA USA Research Laboratory for Design and Testing of Computer and Communication Systems Department of Electrical Computer and System Engineering Boston University Boston MA USA

关键词： Automatic testing Built-in self-test Circuit testing Clocks Test pattern generators Pulse generation Pattern analysis Laboratories System testing design engineering

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Recurrent neural networks and load forecasting

Recurrent neural networks and load forecasting

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International Forum on Applications of Neural Networks to Power systems

作者： J.T. Connor L.E. Atlas D. Martin Interactive Systems Design Laboratory Department of Electrical Engineering University of Washington Seattle WA USA Department of Statistics University of Washington Seattle WA USA

The ability of a recurrent network to model load forecasting is investigated. Its performance in a competition is then contrasted with that of feedforward networks and linear models. Its weaknesses and strengths are then analyzed to give guidelines to the design of neural net predictors with the hope of designing better predictors in the future.< >

关键词： Recurrent neural networks Load forecasting Predictive models State-space methods Technological innovation Neurons Neurofeedback Neural networks Interactive systems Statistics

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Operation of harmonic side-drive micromotors studied through gear ratio measurements

Operation of harmonic side-drive micromotors studied through...

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International Conference on Solid State Sensors and Actuators (TRANSDUCERS)

作者： M. Mehregany S.M. Phillips E.T. Hsu J.H. Lang Electronics Design Center Department of Electrical Engineering & Applied Physics Case Western Reserve University Cleveland OH USA Laboratory for Electromagnetic & Electronic Systems Department of Electrical Engineering & Computer Science Massachusetts Institute of Technology Cambridge MA USA

The detailed operation of variable capacitance harmonic (or wobble) side-drive micromotors was studied through gear ratio measurements. The gear ratio of the wobble micromotor is affected by wear in the bearing and by rotor slip. Rotor slip is a function of motive torque magnitude, excitation angle, and friction torques. The gear ratio of a wobble micromotor can be expressed as a constant term plus a term that accounts for rotor slip. The constant term is the nominal gear ratio which is equal to the bearing radius divided by the bearing clearance. The rotor slip term is directly proportional to the bushing friction torque and inversely proportional to the square of the excitation voltage. Micromotor operation in air as opposed to nitrogen demonstrates a significantly larger bushing friction torque.< >

关键词： Micromotors Gears Friction Insulators Rotors Contacts Electromagnetic measurements Torque Nitrogen Electric variables measurement

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A 7 MHz 24-bit pipelined accumulator in 1.2- mu m CMOS for application as a numerically controlled oscillator

A 7 MHz 24-bit pipelined accumulator in 1.2- mu m CMOS for a...

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Custom Integrated Circuits Conference (CICC)

作者： F. Lu H. Samueli J. Yuan C. Svensson Integrated Circuits and Systems Laboratory Electrical Engineering Department University of California Los Angeles CA USA LSI Design Center Linkoping University Linkoping Sweden

To accomplish timing recovery/synthesis in high-speed communication systems, a 24-b numerically controlled oscillator (NCO) chip using a circuit design technique called true single-phase clock (TSPC) pipelined CMOS has been fabricated in a standard 1.2- mu m CMOS process. The 1.7-mm*1.7-mm IC has a maximum input clock rate of 700 MHz and dissipates 850 mW of power, which is substantially lower than similar ECL and GaAs devices. The digital NCO technique results in a frequency-tuning resolution and open-loop control linearity which cannot be achieved by analog approaches.< >

关键词： Circuit synthesis Clocks CMOS process Timing Control system synthesis Communication system control Oscillators Communication standards Gallium arsenide Frequency

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Programmable analog VLSI CNN chip with local digital logic

Programmable analog VLSI CNN chip with local digital logic

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： K. Halonen V. Porra T. Roska L. Chua Electronic Circuit Design Laboratory Helsinki University of Technology Espoo Finland Computer and Automation Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary Berkeley Department of Electrical Engineering and Computer Sciences University of California Berkeley CA USA

A new integrated circuit cellular neural network (CNN) implementation having digitally or continuously selectable template coefficients is presented. Local logic and memory are added into each cell providing a simple dual (analog and digital) computing structure. The variable-gain operational transconductance amplifiers (OTAs) are used as the voltage controlled current sources to program the template element values. This analog array processor can be applied to solve problems with a sequence of different templates. A 4-by-4 CNN circuit is realized using the 2- mu m analog CMOS process. To test the circuit a general purpose control system was designed with the microcomputer interface.< >

关键词： Very large scale integration Cellular neural networks Logic Circuit testing Digital integrated circuits Analog computers Transconductance Operational amplifiers Voltage control CMOS process

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MAGNETOHYDRODYNAMIC SUBMARINE PROPULSION systems

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NAVAL ENGINEERS JOURNAL 1991年第3期103卷 141-157页

作者： SWALLOM, DW SADOVNIK, I GIBBS, JS GUROL, H NGUYEN, LV VANDENBERGH, HH Daniel W. Swallomis the director of military power systems at Avco Research Laboratory Inc. a subsidiary of Textron Inc. in Everett Mass. Dr. Swallom received his B.S. M.S. and Ph.D. degrees in mechanical engineering from the University of Iowa Iowa City Iowa in 1969 1970 and 1972 respectively. He has authored numerous papers in the areas of power propulsion and plasma physics and currently is a member of the Aerospace Power Systems Technical Committee of the AIAA. Dr. Swallom has directed various programs for the development of advanced power generation systems lightweight power conditioning systems and advanced propulsion systems for marine applications. His previous experience includes work with Odin International Corporation Maxwell Laboratories Inc. Argonne National Laboratory and the Air Force Aero Propulsion Laboratory. Currently Dr. Swallom is directing the technical efforts to apply magnetohydrodynamic principles to a variety of propulsion and power applications for various marine vehicles and power system requirements respectively. Isaac Sadovnikis a principal research engineer in the Energy Technology Office at Avco Research Laboratory Inc. a subsidiary of Textron Inc. He received his B.S. in engineering (1974) B.S. in physics (1975) M.S. in aeronautics and astronautics (1976) and Ph.D. in physics of fluids (1981) at the Massachusetts Institute of Technology. Dr. Sadovnik has been involved in research work funded by DARPA concerning the use of magnetohydrodynamics for underwater propulsion. He has built theoretical models that predict the hydrodynamic behavior of seawater flow through magnetohydrodynamic ducts and their interaction with the rest of the vehicle (thrust and drag produced). In addition Dr. Sadovnik has been involved in research investigations geared toward the NASP program concerning the use of magnetohydrodynamic combustion-driven accelerator channels. Prior to joining Avco Dr. Sadovnik was a research assistant at MIT where he conducted experimental and

Magnetohydrodynamic propulsion systems for submarines offer several significant advantages over conventional propeller propulsion systems. These advantages include the potential for greater stealth characteristics, increased maneuverability, enhanced survivability, elimination of cavitation limits, greater payload capability, and the addition of a significant emergency propulsion system. These advantages can be obtained with a magnetohydrodynamic propulsion system that is neutrally bouyant and can operate with the existing submarine propulsion system power plant. A thorough investigation of magnetohydrodynamic propulsion systems for submarine applications has been completed. During the investigation, a number of geometric configurations were examined. Each of these configurations and mounting concepts was optimized for maximum performance for a generic attack class submarine. The optimization considered each thruster individually by determining the optimum operating characteristics for each one and accepting only those thrusters that result in a neutrally buoyant propulsion system. The results of this detailed optimization study show that the segmented, annular thruster is the concept with the highest performance levels and greatest efficiency and offers the greatest potential for a practical magnetohydrodynamic propulsion system for attack class submarines. The optimization study results were used to develop a specific point design for a segmented, annular magnetohydrodynamic thruster for an attack class submarine. The design point case has shown that this thruster may be able to provide the necessary thrust to propel an attack class submarine at the required velocity with the potential for a substantial acoustic signature reduction within the constraints of the existing submarine power plant and the maintenance of neutral buoyancy. This innovative magnetohydrodynamic propulsion system offers an approach for submarine propulsion that can be an important contributio

关键词： Ship Propulsion

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Brel-a PROLOG knowledge-based system shell for VLSI CAD

Brel-a PROLOG knowledge-based system shell for VLSI CAD

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design automation Conference

作者： M.A. Jabri Systems Engineering and Design Automation Laboratory (SEDAL) Sydney University Electrical Engineering NSW Australia

A knowledge-based system (KBS) shell, called Brel, for VLSI CAD systems is described. Brel has a context recovery system that implements memorization and forgetting and supports a wide range of knowledge representation (frames, rules, procedures, first-order logic, etc.) Brel was developed using PROLOG and successfully used to implement PIAF, a top-down floorplanning system, and TEMPO, a formal verification system for asynchronous circuits based upon temporal logic, and in the development of an automatic layout generation tool. Presented are the memory context, the inference engine, the explanation system. and the multirepresentation access of the knowledge base including the dynamic and static frames.< >

关键词： Knowledge based systems Very large scale integration design automation Artificial intelligence Prototypes design engineering systems engineering and theory Laboratories Australia Constraint optimization

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