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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Ping-Kuen Lam E.W. McCune M.A. soderstrand Department of Electrical and Computer Engineering Digital Signal Processing and Communications Laboratory University of California Davis Davis CA USA

By expressing the frequency response of a Nyquist filter as a convolution of two functions, the mathematical complexity required to find the impulse response of the filter is reduced. Moreover, more efficient Nyquist filters than the popular Raised Cosine filter (i.e. wider 3 dB bandwidth, same absolute bandwidth, and shorter or same length impulse response) are generated by using well known Window functions such as Ramming and Blackman.

关键词： Convolution Cutoff frequency Frequency response Bandwidth Transfer functions Digital signal processing Laboratories Digital filters Wireless communication Data communication

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A simulator construction methodology for the Shiva multiprocessor system 3

A simulator construction methodology for the Shiva multiproc...

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3rd International Conference on Algorithms and Architectures for Parallel processing, ICA3PP 1997

作者： Slomka, S. Sterzl, K.F. Lakshmi Narasimhan, V. Speech Research Laboratory Signal Processing Research Center Queensland University of Technology GPO Box 2434 BrisbaneQLD4001 Australia PA SE Research Laboratory Department of Electrical and Computer Engineering University of Queensland St. LuciaQLD4072 Australia Information Management Group ITD DSTO SalisburySA5108 Australia

ISBN: (纸本)0780342291

This paper describes a simulator for the Shiva multiprocessor system and the simulator construction methodology (SCM) used in its creation. The SCM, based on the active functional unit (AFU) construct, is a modern SCM which is flexible, accurate, fast, easy to use, capable of dynamic reconfigurability at run-time, and most of all simple and capable of quick simulator construction. The AFU SCM is capable of all these things through the use of object-oriented software techniques. The Shiva simulator constructed using the AFU SCM is program-driven and capable of micro and macro architectural simulation. © 1997 IEEE.

关键词： multiprocessing systems

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Model-based detection and correction of corrupted wavelet coefficients

Model-based detection and correction of corrupted wavelet co...

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IEEE International Conference on Image processing

作者： N. Strobel S.K. Mitra B.S. Manjunath Signal and Image Processing Laboratory Department of Electrical and Computer Engineering University of California Santa Barbara USA University of California Santa Barbara Santa Barbara CA US

Image decomposition based on the discrete wavelet transform (DWT) has been proposed for efficient storage and progressive transmission of images for visual browsing in digital image libraries. Although the compression aspects of the DWT have been carefully researched, reconstruction errors due to corrupted wavelet coefficients have received less attention. In this paper we consider the problem of bit errors affecting uniformly quantized wavelet coefficients. The proposed method, which is based on a local image model, simultaneously detects and masks corrupted wavelet coefficients.

关键词： Wavelet coefficients Image coding Image reconstruction Discrete wavelet transforms Filters Decoding Error correction Image edge detection signal processing Image processing

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Robustness of delta operator based cellular neural networks

Robustness of delta operator based cellular neural networks

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： B. Mirzai H.C. Reddy G.S. Moschytz Signal and Information Processing Laboratory Swiss Federal Institute of Technology Zurich Switzerland Department of Electrical and Computer Engineering University of California Irvine CA USA Department of Electrical Engineering California State University Long Beach CA USA

The delta operator approach to continuous-time cellular neural networks (CT-CNNs) is investigated in terms of a robust realization. It is shown that earlier results concerning the robustness of CT-CNNs can be obtained as a limiting case of this approach, while at the same time, this allows us to formulate robustness considerations for discrete-time CNNs.

关键词： Robustness Cellular neural networks Sampling methods signal processing Limiting Nonlinear equations Information processing Laboratories computer networks Image processing

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The contrast pyramid based image code

The contrast pyramid based image code

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IEEE International Conference on Image processing

作者： Tian-Hu Yu Jianhua Chen S.K. Mitra Department of Information Engineering Chinese University of Hong Kong New Territories Hong Kong China Department of Electrical and Computer Engineering Signal and Image Processing Laboratory University of California Santa Barbara CA USA

In this paper, a contrast pyramid based image coding method is described in which a simple nonlinear difference operation is introduced to generate residual information between two contiguous level images. The representation of the residual information can be considered as a local contrast measure. As the difference image in established pyramid coding techniques, the contrast image has low variance, and data compression is achieved by quantizing the contrast image. Based on Weber's law and spatial masking of the human visual system, further data compression can be attained by selecting only perceptually significant information from the contrast image and coding it efficiently.

关键词： Image coding Laplace equations Low pass filters Data compression Humans Data structures Nonlinear filters Filtering Image generation Visual system

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A simulator construction methodology for the Shiva multiprocessor system

A simulator construction methodology for the Shiva multiproc...

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IEEE International Conference on Algorithms and Architectures for Parallel processing (ICAP)

作者： S. Slomka K.F. Sterzl V. Lakshmi Narasimhan The Speech Research Laboratory Signal Processing Research Center Queensland University of Technology Brisbane QLD Australia The PA SE Research Laboratory Department of Electrical and Computer Engineering University of Queensland Saint Lucia QLD Australia Information Management Group ITD DSTO Salisbury SA Australia

关键词： multiprocessing systems Computational modeling Object oriented modeling signal generators Laboratories computer simulation Discrete event simulation Speech processing signal processing Information management

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A new time series classification approach

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signal processing 1996年第2期54卷 191-199页

作者： Plataniotis, KN Androutsos, D Venetsanopoulos, AN Lainiotis, DG Department of Electrical and Computer Engineering Digital Signal & Image Processing Laboratory University of Toronto 10 King's College Rd. Toronto Ontario M5S 3G4 Canada Intelligent Systems Technology 3207 S. Hwy. A1A Melbourne Beach FL-32951 USA

A new, robust and computationally attractive approach to the problem of time series classification is discussed in this paper. Both the Bayesian as well as a new adaptive classification scheme for source selection are... 详细信息

关键词： time series classification neural networks logistic function

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Neural network classification of spatio-temporal EEG readiness potentials

Neural network classification of spatio-temporal EEG readine...

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Southern Biomedical engineering Conference

作者： A.B. Barreto A.M. Taberner L.M. Vicente Digital Signal Processing Laboratory Electrical & Computer Engineering Department Florida International University Miami FL USA

The detection of spatio-temporal scalp EEG patterns associated with voluntary motion preparation towards the development of a brain-computer interface (BCI) is explored. The rationale for the use of a spatio-temporal approach to this detection problem is explained. The need for a temporal or dynamic classifier is confirmed by demonstration of the lack of robustness in static neural network classifiers with respect to time alignment of the patterns under analysis. The results from dynamic classifiers, such as the Time Delay Neural Network (TDNN) and the Gamma Neural Network are presented in terms of their Receiver Operating Characteristic (ROC) Curves.

关键词： Neural networks Electroencephalography Rhythm Biological neural networks Motion detection Eyes Digital signal processing Brain computer interfaces computer interfaces Scalp

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Classification of spatio-temporal EEG readiness potentials towards the development of a brain-computer interface

Classification of spatio-temporal EEG readiness potentials t...

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IEEE Southeastcon

作者： A.B. Barreto A.M. Taberner L.M. Vicente Digital Signal Processing Laboratory Electrical & Computer Engineering Department Florida International University Miami FL USA

The existence of characteristic changes in the EEG of a subject preparing for the execution of a voluntary movement is reviewed. Some of those changes, i.e., the "readiness potentials" (RPs), are suggested as a possible link between the internal processes associated with different forms of motion preparation and a digital signal processing system designed to classify the different intended movements. Such a system can potentially be used to provide input to a specialized graphic user interface, constituting a brain-computer interface (BCI). Our current work on neural-network classification of RPs is summarized and the results are presented.

关键词： Electroencephalography Brain computer interfaces Digital signal processing Physiology Aggregates Rhythm Laboratories Process design signal design Graphics

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Implications of a segmentation-based motion compensation scheme for the case of a block transform encoder

Implications of a segmentation-based motion compensation sch...

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International Conference on Acoustics, Speech, and signal processing (ICASSP)

作者： M. Sipitca Department of Electrical and Computer Engineering Digital Signal Processing Laboratory Georgia Institute of Technology Atlanta GA USA

Sipitca and Madisetti (see VCIP '96, Orlando, Florida, 1996) have proposed the use of analog position sensors for a more accurate motion compensation on videoconferencing sequences. We investigate the results of including such a motion compensation scheme in a transform based encoder. The more successful motion compensation makes the resulting displaced frame difference (DFD) less correlated. In fact, the autocorrelation function goes practically to zero for a lag larger than 4-5 pels. Therefore, the 4/spl times/4 DCT can be used instead of the 8/spl times/8 DCT. This helps in dealing better with the relatively small regions where the DFD takes on larger values-on the border regions and in the new information regions. Finally, a block swapping algorithm and an appropriate error measure are introduced.

关键词： Motion compensation computer aided software engineering Head Design for disassembly Discrete cosine transforms Image segmentation Microphones Image edge detection Paper technology Digital signal processing

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