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Design optimization of integer lifting DWT circuitry for implantable neuroprosthetics

Design optimization of integer lifting DWT circuitry for imp...

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international conference on Microtechnologies in Medicine and Biology

作者： A. Mason J. Li K. Thomson Y. Suhail K. Oweiss Electrical and Computer Engineering Department Michigan State University East Lansing MI USA

Neuroprosthetics can benefit greatly from area and power efficient signal processing circuitry suitable for implanting alongside miniature neural probes that interface to the nervous system. This work identifies an optimal VLSI architecture for computing a 1-dimensional multilevel discrete wavelet transform for multiple electrode channels simultaneously. The architecture is based on the lifting-scheme for wavelet computation and integer fixed-point precision for real-time processing under constraints imposed by implantability requirements. Two different computational node designs have been explored and compared to identify an optimal approach that minimizes power and chip area for a given number of levels and channels. Results demonstrate that on-chip computation is feasible prior to data transmission.

关键词： Design optimization Discrete wavelet transforms Circuits Neural prosthesis Computer architecture signal processing Probes Nervous system Very large scale integration Electrodes

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Scheduling of DSP algorithms onto heterogeneous multiprocessors with inter-processor communication

Scheduling of DSP algorithms onto heterogeneous multiprocess...

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Annual IEEE Northeast Workshop on Circuits and Systems (NEWCAS)

作者： A. Itradat M.O. Ahmad A. Shatnawi Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada Department of Computer Engineering Jordan University of Science and Technology Irbid Jordan

In recent years a great deal of research has been conducted in the area of scheduling DSP data flow graphs (DFG) onto heterogeneous multiprocessing systems. However, there is not yet much research conducted for designing the scheduling algorithms that consider the inter-processor communication delays. This paper presents a novel technique to obtain time and processor schedules for cyclic DFGs representing DSP algorithms onto a heterogeneous multiprocessor systems by taking into consideration the inter-processor communication delays. In the proposed technique the communication delay between a pair of nodes of the different type is treated as a non-computing node, whereas that between a pair of nodes of the same type is taken into account by re-adjusting the firing times of the appropriate nodes of DFG. A simulation is carried to illustrate the proposed technique by applying it to a second-order digital filter. The results show the proposed technique can produce optimal time and processor-allocation schedules.

关键词： Digital signal processing Scheduling algorithm Processor scheduling Multiprocessing systems signal processing algorithms Optimal scheduling Delay Iterative algorithms Flow graphs Algorithm design and analysis

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Robust independent component analysis for cognitive informatics

Robust independent component analysis for cognitive informat...

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IEEE international conference on Cognitive Informatics

作者： N. Gadhok W. Kinsner Department of Electrical and Computer Engineering Signal and Data Compression Laboratory University of Manitoba Winnipeg MAN Canada

This paper evaluates the outlier sensitivity of five independent component analysis (ICA) algorithms (FastICA, extended-Infomax, JADE, radical, and /spl beta/-divergence) using: (i) the Amari separation performance index, (ii) the optimum angle of rotation error, and (iii) the contrast function difference, in an outlier-contaminated mixture simulation. The Amari separation performance index has revealed a strong sensitivity of JADE and FastICA, using 3rd- and 4th- order nonlinearities, to outliers. However, the two contrast measures demonstrated conclusively that /spl beta/-divergence is the least outlier-sensitive algorithm, followed by Radical, FastICA (exponential and hyperbolic-tangent nonlinearities), extended-Infomax, JADE, and FastICA (3rd-and 4th-order nonlinearities) in an outlier-contaminated mixture of two uniformly distributed signals. The novelty of this paper is the development of an unbiased optimization-landscape environment for assessing outlier sensitivity, as well as the optimum angle of rotation error and the contrast function difference as promising new measures for assessing the outlier sensitivity of ICA algorithms.

关键词： Robustness Independent component analysis Cognitive informatics Electroencephalography signal processing algorithms Statistical analysis Performance analysis Brain modeling Biomedical measurements Pollution measurement

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Digital Watermark Technique Based on Speech signal

Digital Watermark Technique Based on Speech Signal

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2004 3rd international conference on Computational Electromagnetics and Its Applications

作者： LV Jiu-ming Luo Jing-qing Yuan Xue-hua Research Room 206 Electronic Engineering Institute

ISBN: (纸本)0780385624

With the fast development of digital signal processing,network and multimedia techniques,the digital watermark technique is applied extensively in the domains of data information identification and data product *** wavelet transform technique can process the data of speech signal etc.,the signal can be decomposed into the low frequency and high frequency part of multi-levels,which can be encrypted by the processing of the digital watermark technique,and will attain the encryption or concealment goal of the speech *** paper introduces the wavelet transform and its technical application in digital watermark in speech signals,in end the signals of non-encryption speech before or encrypted speech after is played and compared.

关键词： watermark technique Wavelet Decomposition encrypted speech Wigner distribution

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Multiresolution wavelet decomposition to merge Landsat TM and SPOT panchromatic data

Multiresolution wavelet decomposition to merge Landsat TM an...

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2004 3rd international conference on Computational Electromagnetics and Its Applications

作者： Wu Yan Li Ming LiaoGuisheng National Key Lab.Of Radar signal processing Xidian Univ. School of Electronics Engineering Xidian Univ

ISBN: (纸本)0780385624

A new algorithm is developed to merge a high-resolution panchromatic image and a low-rcsohition multi-spcctral image based on the combination of multi-resolution wavelet decomposition and the IHS *** high-resolution panchromatic image is firstly ciecornposed to the wavelet planes,then the region is divided by edge information from the wavelet planes and the intensity component from multi-spectral image is merged by fusion operator in different *** proposed method is compared with the IHS and the MWT *** experimental results show that the proposed method can achieve better fusion performance in combining and preserving spectral-spatial information.

关键词： Image fusion,Wavelet plane,Fusion operator IHS transform

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A rapid prototyping framework for audio signal processing algorithms

A rapid prototyping framework for audio signal processing al...

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3rd international conference on Field-Programmable Technology

作者： Voss, N Eisenbach, T Mertsching, B Univ Paderborn Fac Comp Sci GET Lab D-33098 Paderborn Germany

ISBN: (纸本)0780386515

In this paper we present a rapid-prototyping environment for functional verification and test of digital signal processing algorithms. The environment consists of a Virtex-II device on a PCI-card and an appropriate generic software backend which is used to pre- and post-process the data and to transfer it to the FPGA and pull the results from it. It is designed to meet real-time requirements by means of interleaving block-transfers to and from a large on-board memory. We use the system for the development and test of audio signal processing applications. The implementation and test of the gammatone-resynthesis algorithm is described as an exemplary algorithm that has been tested within the environment. The presented system is part of a software framework for rapid development of power optimized audio signal processing applications on behavioral level using library elements.

关键词： Rapid prototyping

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The estimation for 2-D direction of arrival based on higher-order cumulant of signals received by circle array

The estimation for 2-D direction of arrival based on higher-...

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ICCEA 2004 - 2004 3rd international conference on Computational Electromagnetics and its Applications

作者： Sujuan, Wei Jiahao, Deng Shuguang, Pan Dongning, Sun Xingguang, Duan Beijing Institute of Technology Beijing 100081 China

ISBN: (纸本)0780385624

Based on the fourth-order cumulant of signals received by a uniform circular array of the bomb-carrying, the method for estimating 2-D direction of arrival is discussed. It can be employed to estimate parameters in the environment of arbitrary Gaussian noise without any spectral peak searching. The method of parameter match is analyzed. Iterative algorithm for higher-order cumulant is discussed, with which the process of data sampling and parameter estimating can be done in parallel. The validity of the method is proved by the result of the simulation. ©2004 IEEE.

关键词： signal processing

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The Estimation for 2-D Direction of ArrivalBased on Higher-order Cumulant of signals Received by Circle Array

The Estimation for 2-D Direction of ArrivalBased on Higher-o...

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2004 3rd international conference on Computational Electromagnetics and Its Applications

作者： Wei sujuan Deng jiahao Pan Shuguang Sun Dongning Duan Xingguang Beijing Institute of Technology

ISBN: (纸本)0780385624

Based on the fourth-order cumulant of signals received by a uniform circular array of the bomb-carrying,the method for estimating 2-D direction of arrival is *** can be employed to estimate parameters in the environment of arbitrary Gaussian noise without any spectral peak *** method of parameter match is *** algorithm for higher-order cumulant is discussed,with which the process of data sampling and parameter estimating can be done in *** validity of the method is proved by the result of the simulation.

关键词： signal processing higher-order cumulant uniform circular array

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Noise cancellation using fixed beamforming

Noise cancellation using fixed beamforming

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IEEE international Workshop on Haptic, Audio and Visual Environments and Their Applications

作者： J. Dmochowski R. Goubran Department of Systems and Computer Engineering Carleton University USA

This work presents a noise cancellation structure with a fixed beamformer front end. Simulation results show a noise reduction of 21 dB with a speech source-noise source separation of 1m. Moreover, experimental results (real data acquired in a reverberant conference room) show a complex noise reduction pattern with a maximum noise reduction of 17 dB.

关键词： Noise cancellation Array signal processing Microphone arrays Noise reduction Acoustic beams Working environment noise Acoustic noise Speech enhancement signal to noise ratio Intelligent sensors

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Experimental characterization for the binary two-dimensional optical storage channel

Experimental characterization for the binary two-dimensional...

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IEEE international conference on Communications (ICC)

作者： L. Fagoonee A. Moinian B. Honary A. van der Lee W.M.J. Coene Department of Communication Systems Lancaster University Lancaster UK Philips Research Laboratories Eindhoven Netherlands

A new and challenging concept for optical storage is being developed, in which the information written on the disc has a two-dimensional characteristic, with the aim of realizing an increase of a factor of two in data density and a factor of ten in data rate over the current 3rd generation of optical storage (Blu-Ray Disc, BD). Experimental channel characterization provides insight into the magnitude of intersymbol interference, signal levels, modulation and noise distribution from the measured signal waveform. This information is used to evaluate the quality of the mastered discs, and provide feedback in the optimization process. It also yields essential input to the actual design of the signal processing solutions. The stages involved in characterizing the channel are downsampling and model fitting using a scalar diffraction model. The information gathered from channel characterization is demonstrated with experimental measurements from discs with an initial density of 1.4/spl times/BD using the same physical read-out system (blue laser and high-NA lens).

关键词： Optical feedback Optical signal processing Optical noise Character generation Optical modulation Intersymbol interference Noise level Noise measurement signal design signal processing

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