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IEEE Workshop on applications of Signal Processing to Audio and Acoustics

作者： Junfeng Li Shuichi Sakamoto Satoshi Hongo Masato Akagi Yôiti Suzuki School of Information Science Japan Advanced Institute of Science and Technology Japan Research Institute of Electrical Communication University of Tohoku Japan Department of Design and Computer Application Miyagi National College of Technology Japan

The equalization-cancellation (EC) model has been extensively studied for expressing binaural masking level difference (BMLD) in psychoacoustics. Few research focuses on applying this psychoacoustic model to speech processing applications, such as speech enhancement. In this paper, we propose a two-stage binaural speech enhancement with Wiener filter (TS-BASE/WF) based on the EC model. In this proposed TS-BASE/WF, interfering signals are first estimated by equalizing and cancelling the target signal based on the EC model, and a time-variant Wiener filter is then applied to enhance the target signal given noisy mixture signals. The main advantages of the proposed TS-BASE/WF are: (1) effectiveness in dealing with non-stationary multiple-source interfering signals; (2) success in localizing the target sound source after processing. These advantages were confirmed by comprehensive experiments in different spatial scenarios in terms of speech enhancement and sound localization.

关键词： Speech enhancement Wiener filter Psychoacoustic models Signal processing Speech processing Acoustic noise Ear Noise cancellation Auditory system Working environment noise

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The Improved TS-BASE Approaches with Interference Compensation and Their Evaluations for Speech Enhancement

The Improved TS-BASE Approaches with Interference Compensati...

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International Symposium on Chinese Spoken Language Processing

作者： Junfeng Li Shuichi Sakamoto Satoshi Hongo Masato Akagi Yoiti Suzuki School of Information Science Japan Advanced Institute of Science and Technology Japan Research Institute of Electrical Communication University of Tohoku Japan Department of Design and Computer Application Miyagi Natational College of Technology Japan

ISBN: (纸本)9781424429424

We previously proposed a two-stage binaural speech enhancement with Wiener Filter (TS-BASE/WF) approach for hearing aids in adverse environments [6]. In TS-BASE/WF, the interfering signal is estimated by cancelling the target signal through an adaptive filter in the first stage and a time- variant Wiener filter is applied to enhance the target signal in the second stage. In this paper, we introduce an interference compensation approach, which is applied to the adaptive-filter output, to further improve the estimation accuracy of the interfering signal. The performance of TS-BASE with different speech enhancers is then investigated in different conditions. Experimental results show that the improved TS-BASE algorithms with interference compensation outperform the original TS-BASE algorithms, and that TS-BASE/WF gives the higher speech enhancement performance over the improved TS-BASE algorithms with other speech enhancers.

关键词： Interference Speech enhancement Hearing aids Signal processing algorithms Wiener filter Adaptive filters Acoustic noise Noise reduction Auditory system Working environment noise

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TRACKING CONTROL IN THE PRESENCE OF NONLINEAR DYNAMIC FRICTIONAL EFFECTS: ROBOT EXTENSION

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Asian Journal of Control 2008年第3期1卷

作者： M. Feemster D.M. Dawson A. Behal W. Dixon Matthew Feemster received the B.S degree in Electrical Engineering from Clemson University Clemson South Carolina in December 1994. Upon graduation he remained at Clemson University and received the M.S. degree in Electrical Engineering in 1997. During this time he also served as a research/teaching assistant. His research work focused on the design and implementation of various nonlinear control algorithms with emphasis on the induction motor and mechanical systems with friction present. He is currently working toward his Ph.D. degree in Electrical Engineering at Clemson University. Darren M. Dawson was born in 1962 in Macon Georgia. He received an Associate Degree in Mathematics from Macon Junior College in 1982 and a B.S. Degree in Electrical Engineering from the Georgia Institute of Technology in 1984. He then worked for Westinghouse as a control engineer from 1985 to 1987. In 1987 he returned to the Georgia Institute of Technology where he received the Ph.D. Degree in Electrical Engineering in March 1990. During this time he also served as a research/teaching assistant. In July 1990 he joined the Electrical and Computer Engineering Department and the Center for Advanced Manufacturing (CAM) at Clemson University where he currently holds the position of Professor. Under the CAM director's supervision he currently leads the Robotics and Manufacturing Automation Laboratory which is jointly operated by the Electrical and Mechanical Engineering departments. His main research interests are in the fields of nonlinear based robust adaptive and learning control with application to electro-mechanical systems including robot manipulators motor drives magnetic bearings flexible cables flexible beams and high-speed transport systems. Aman Behal was born in India in 1973. He received his Masters Degree in Electrical Engineering from Indian Institute of Technology Bombay in 1996. He is currently working towards a Ph.D in Controls and Robotics at Clemson University. His research focuses on the control of no

In this paper, we extend the observer/control strategies previously published in [25] to an n -link, serially connected, direct drive, rigid link, revolute robot operating in the presence of nonlinear friction effects modeled by the Lu-Gre model. In addition, we also present a new adaptive control technique for compensating for the nonlinear parameterizable Stribeck effects. Specifically, an adaptive observer/controller scheme is developed which contains a feedforward approximation of the Stribeck effects. This feedforward approximation is used in a composite controller/observer strategy which forces the average square integral of the position tracking error to an arbitrarily small value. Experimental results are included to illustrate the performance of the proposed controllers.

关键词： Friction compensation nonlinear control

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Micro-fabrication and high-productivity etching system for 65-nm node and beyond

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Hitachi Review 2006年第2期55卷 83-87页

作者： Tsutsumi, Takashi Kadotani, Masanori Saito, Go Mori, Masahito Application Technology Department Semiconductor Equipment Business Group Hitachi High-Technologies Corporation Etching System Design Department Nanotechnology Products Business Group Hitachi High-Technologies Corporation Advanced Technology Research Department Solution LSI Research Laboratory Central Research Laboratory JSAP

OVERVIEW: In regard to cutting-edge semiconductor devices, mass production of 65-nm node devices is about to begin, and development aiming beyond the 45-nm node has already started. Along with this trend, demands for advanced miniaturization and precision-improvement techniques are growing, and the needs for handling new materials and establishing production stability are getting stronger. With these circumstances in mind and taking miniaturization, high precision, and high throughput as a base concept, Hitachi High-Technologies Corporation has developed etching systems and processes for handling the post-65-nm node. Aimed at improving the uniformity across a wafer surface during etching of 300-mm-diameter wafers, an etching reactor - with uniformized discharge-gas rate and a mechanism for controlling electrode-temperature difference - was developed. A "resist trimming" technique, which can handle dimensions that surpass the exposure limit of current lithography, was also developed. Moreover, the etching reactor was designed and developed to realize low CoO, namely, improved operability and shorter maintenance downtime, and is targeting silicon-etching systems for handling the post-45-nm node.

关键词： Etching

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Failure analysis system for submicron semiconductor devices

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Hitachi Review 2006年第2期55卷 68-72页

作者： Fukui, Munetoshi Mitsui, Yasuhiro Nara, Yasuhiko Yano, Fumiko Furukawa, Takashi Application Technology Department Advanced Equipment and Systems Sales Division Hitachi High-Technologies Corporation Advanced Microscope Systems Design Department Nanotechnology Products Business Group Hitachi High-Technologies Corporation Failure Analysis Technology Group Process and Device Analysis Engineering Development Department Renesas Technology Corp. Advanced Technology Research Department Central Research Laboratory

Failure analysis of semiconductor device is becoming increasingly difficult as VLSI technology evolves toward smaller features and semiconductor device structures become more complex. Especially considering that the defective area obtained through diagnosis pin-pointing faulty sites is not the same size as the area subjected to physical analysis, and this disparity becomes more pronounced as feature sizes shrink. This prompted us to develop an extremely fine scaled SEM mechanical probing system permitting identification of minute fault sites. The development involved a number of related projects including investigation of a precision probe and stage mechanism that can deal with submicron semiconductor devices, a six-probe mechanism for expanded capabilities of performing inverter measurements and precision single transistor measurements, a probe and sample exchange mechanism that works while under vacuum to achieve high throughput, and a robust CAD navigation system. The system is now ready and available for practical application to 65-nm feature devices, and can be readily adapted to at least the next couple of generation nodes.

关键词： Failure analysis

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Baseband analog front-end and digital back-end for reconfigurable multi-standard terminals

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IEEE Circuits and Systems Magazine 2006年第1期6卷 8-26页

作者： Baschirotto, A. Castello, Rinaldo Campi, Fabio Cesura, Giovanni Toma, Mario Guerrieri, Roberte Lodi, Andrea Lavagno, Luciano Malcovati, Piero Department of Electronics University of Pavia Italy STMicroelectronics Italy Advanced Research Center on Electronic Systems University of Bologna Italy Department of Electronics Politecnico di Torino Italy Department of Electrical Engineering University of Pavia Italy Department of Central Research and Development ST Microelectronics Italy Bologna Italy Department of Electronics University of Pavia Italy Italy Solid State Circuit Society IEEE Italy IEEE Italy Semiconductor Laboratory Max Planck Institute of Terrestrial and Extrater- Restrial Physics Munich Germany New IP and Design Support of the Computer and Peripheral Group of ST-Microelectronics University of Bologna Italy Politecnico di Torino Italy Cadence Berkeley Laboratories United States STMicroelectronics Italy Bologna Italy Department of Electrical Engineering University of Pavia Italy CR and D ST-Microelectronics Agrate Brianza Italy

Multimedia applications are driving wireless network operators to add high-speed data services such as Edge (E-GPRS), WCDMA (UMTS) and WLAN (IEEE 802.11a,b,g) to the existing network. This creates the need for multi-mode cellular handsets that support a wide range of communication standards, each with a different RF freguency, signal bandwidth, modulation scheme, etc. This in turn generates several design challenges for the analog and digital building blocks of the physical layer. In addition to the above-mentioned protocols, mobile devices often include Bluetooth, GPS, FM-radio and TV services that can work concurrently with data and voice communication. Multi-mode, multi-band, and multi-standard mobile terminals must satisfy all these different reguirements. Sharing and/or switching transceiver building blocks in these handsets is mandatory in order to extend battery life and/or to reduce cost. Only adaptive circuits that are able to reconfigure themselves within the handover time can meet the design reguirements of a single receiver or transmitter covering all the different standards while ensuring seamless inter-interoperability. This paper presents analog and digital base-band circuits that are able to support GSM (with Edge), WCDMA (UMTS), WLAN and Bluetooth using reconfigurable building blocks. The blocks can trade off power consumption for performance on the fly, depending on the standard to be supported and the reguired QoS (Quality of Service) level. © 2006 IEEE.

关键词： computer terminals

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Survey of reduced workload and crewing strategies for ocean patrol vessels

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NAVAL ENGINEERS JOURNAL 2001年第2期113卷 29-44页

作者： Baker, C Krull, R Snyder, G Lincoln, W Malone, TB Clifford C. Baker CIE CHFEP is a senior staff scientist at Carlow International Incorporated. He has applied most of his 24 years of experience in the application of human engineering technology to maritime systems. Mr. Baker has directed much of Carlow's efforts to reduce ship workload and to improve human performance and maritime safety through application of human factors methods and data. He is a Certified Industrial Ergonomist (CIE) as well as a Certified Human Factors Engineering Professional (CHFEP). Both certifications were granted by Oxford Research where Mr. Baker also serves as an Advisory Board member. Russell D. Krull P.E. is a senior engineer with A&T/Proteus Engineering with more than 18 years of experi-ence in marine engineering naval architecture and program management including 16 years of active duty in the U.S. Coast Guard. Recent experience includes advanced ship design studies engineering software development technical support for the USMC Advanced Amphibious Assault Vehicle propulsion systems analyses ship structural engineering and cargo handling systems engineering. Mr. Krull has an M.S.E. in naval architecture and marine engineering and an M.S.E. in industrial and operations engineering from University of Michigan and a B.S. in ocean engineering from the U.S. Coast Guard Academy. Capt. Glenn L. Snyder USCG. Regrettably since this paper was originally written Capt. Snyder has passed away. At the time of his death he was an operations specialist assigned to the Coast Guard's Deepwater Capabilities Replacement Project as Chief of Human Systems Integration. He served as commanding officer of the patrol boat Cape George (WPB-95306) the icebreaking tug Biscayne Bay (WTGB-104) and the cutter Legare (WMEC-911). A 1975 graduate of the U.S. Coast Guard Academy Capt. Snyder held an M.A. in national security and strategic studies from the U.S. Naval War College and an M.A. in international relations from Salve Regina College. In addition he was a 1998 fellow of the Foreign Service

The U.S. Coast Guard is in the concept exploration phase of its Integrated Deepwater System (IDS) acquisition project. This project will define the next generation of surface, air and command, control, communications, computers, intelligence, surveillance, and reconnaissance (C4ISR) assets used to perform the Coast Guard's missions in the IDS environment (>50 NM off the U. S. coastline). As part of early technology investigations, the needs exist to: (1) analyze the workload requirements of the IDS, (2) identify alternative means to perform ship's work, and (3) optimize ship manning consistent with ship workload, performance criteria, and the available tools and equipment aboard. To reduce shipboard work requires an understanding of the mission and support requirements placed on the vessel and crew, how these requirements are currently met, and how requirements might otherwise be met to reduce workload and crew size. This study examined currently implemented workload and manpower reducing approaches of commercial maritime fleets, U.S. and foreign navies, and foreign coastguards. These approaches were analyzed according to evaluation criteria approved by the IDS acquisition project team. From this, strategies for shipboard work reduction that may be considered for adoption by the IDS were identified and analyzed according to performance and costs factors. Ten workload-reducing strategies were identified: damage control, bridge, multiple crewing, engineering, risk acceptance, modularity, deck, enabling technologies, ship/personnel readiness, and operability and maintainability.

关键词： Naval vessels

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MACAO-a journey into CAx interoperability and collaborative design

MACAO-a journey into CAx interoperability and collaborative ...

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International Conference on Information Visualisation (IV)

作者： F. Arnold Research Group for Computer Application in Engineering Design University of Kaiserslautern Germany

The increasing parallelisation of development processes as well as the ongoing trends towards virtual product development and outsourcing of development activities strengthen the need for 3D co-operative design via communication networks. Regarding the field of CAx, none of the existing systems meets all the requirements of very complex process chain. This leads to a tremendous need for the integration of heterogeneous CAx systems. Therefore, MACAO, a platform-independent client for a distributed CAx component system, the so-called ANICA CAx object bus, is presented. The MACAO client is able to access objects and functions provided by different CAx servers distributed over a communication network. Thus, MACAO is a new solution for engineering design and visualisation in shared distributed virtual environments. This paper describes the underlying concepts, the actual prototype implementation, as well as possible application scenarios in the area of co-operative design and visualisation.

关键词： Collaboration Communication networks Visualization Product development Outsourcing File servers Network servers design engineering Virtual environment Prototypes

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Forecasting time series using logical combinations of neural-based networks

Forecasting time series using logical combinations of neural...

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IEEE International Conference on Systems, Man and Cybernetics

作者： A. Thammano Advanced Computer Application and Design Research Group Faculty of Information Technology King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand

Forecasts are the basis for planning and decision making. The more accurate the organization's forecasts, the better prepared it will be to take advantage of future opportunities and to reduce potential risks. Thus, it should come as no surprise that there is a tremendous number of statistical prediction algorithms already in existence. However, most of them are useful only when the time series exhibit little trend or seasonal variations but a great deal of irregular or random variation. Therefore, the objective of this paper is to propose a new intelligent forecasting technique which is constructed by combining n-trained neural-based network together. The experimental results based on simulated data show a significant improvement in forecasting accuracy.

关键词： Neural networks Predictive models Fuzzy systems Backpropagation algorithms Economic forecasting Feedforward neural networks Intelligent networks Decision making Econometrics Genetic algorithms

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Patterns of joint angles during termination of human gait

Patterns of joint angles during termination of human gait

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IEEE International Conference on Systems, Man and Cybernetics

作者： P. Vanitchatchavan Advanced Computer Application and Design Research Group Faculty of Information Technology King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand

This paper is concerned with the patterns of joint angles of the lower extremity of the body (hip, knee and ankle angle) during the termination of human gait. The termination of human gait is defined as the transition from a steady-state gait to a quiet standing posture. The transition between these two states has not been extensively studied and defined. There appears to be a critical period in the gait cycle in which the decision to terminate the gait or to continue to take an additional step must be made.

关键词： Humans Legged locomotion Steady-state Joints computer applications Information technology Extremities Hip Knee Circuits

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