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Low-complexity multi-mode VXC using multi-stage optimization and mode selection (speech coding)

Low-complexity multi-mode VXC using multi-stage optimization...

引用

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

作者： M. Johnson T. Taniguchi Department of Electrical Engineering and Computer Science MIT Cambridge MA USA Speech Signal Processing Fujitsu Laboratories Limited Kawasaki Japan

The authors propose an algorithm in which multi-mode coding is a transparent adaptation of multi-stage VXC (vector excitation coding) requiring almost zero additional computation. In the process, it is shown how the cost of the jointly optimized multi-stage VXC can be minimized using a backward-transform implementation of the perceptually orthogonal VXC (POVXC) algorithm previously proposed by the authors. It is shown that the performance of such a coder, while not as good as that of a normal multi-mode coder, is noticeably better than that of a normal POVXC.< >

关键词： Speech coding Linear predictive coding Speech processing Adaptive filters Bit rate Cost function Vocoders Computational complexity Vector quantization Code standards

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Pitch sharpening for perceptually improved CELP, and the sparse-delta codebook for reduced computation

Pitch sharpening for perceptually improved CELP, and the spa...

引用

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

作者： T. Taniguchi M. Johnson Y. Ohta Department of Electrical Engineering and Computer Science MIT Cambridge MA USA Speech Signal Processing Fujitsu Laboratories Limited Kawasaki Japan

The authors introduce two techniques for improving low-bit-rate CELP (code excited linear prediction) speech coders. The sparse-delta stochastic codebook is a recursive codebook design which can be searched using roughly 5% of the computational load required to search a full Gaussian codebook. Pitch sharpening is a class of algorithms which attempt to improve the perceptual quality of CELP by limiting the feedback of low-amplitude noiselike information to the adaptive codebook. Simulation results are presented for sparse-delta, ternary sparse-delta, and simplified-search sparse-delta coders, and for reduced-gain and sparse-adaptive-codebook pitch sharpening algorithms.< >

关键词： Stochastic resonance Books Feedback Stochastic processes Bit rate Finite impulse response filter Equations Speech synthesis Code standards Linear predictive coding

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Petri Net based Models for Condition/Event Systems

Petri Net based Models for Condition/Event Systems

引用

American Control Conference (ACC)

作者： R.S. Sreenivas B.H. Krogh Laboratory for Automated Systems and Information Processing Department of Electrical Engineering and Computer Engineering Carnegie Mellon University Pittsburgh PA USA

In this paper we define a class of continuous-time discrete event dynamic systems (DEDS) with two types of discrete-valued input and output signals: condition signals and event signals called Condition/Event systems (C/E systems). We formally define C/E systems and models of C/E systems that are based on an extension of Petri nets (C/E PNs). We then introduce equivalent C/E PN models for C/E systems resulting from cascade and feedback interconnections via examples. The algorithms that compute these equivalent models can be found in reference [1] The paper concludes with directions for future research.

关键词： Feedback Petri nets Disruption tolerant networking Topology Books Terminology

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Adaptive noise reduction using discrimination functions

Adaptive noise reduction using discrimination functions

引用

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

作者： W. Etter G.S. Moschytz D. Graupe Institute of Signal and Information Processing ETH Zurich Zurich Switzerland Department of Electrical Engineering and Computer Science University of Illinois Chicago IL USA

A method of noise reduction based on discrimination function minimization (DFM) is presented. This method requires the definition of a function that discriminates between clean and noisy speech. A particular discrimination function is derived for a certain type of noise, such that the minimization of this function reduces the noise in the noisy speech signal. The DFM noise reduction method does not assume stationarity of the noise over an entire speech period. It is shown how an abrupt change in piecewise-stationary noise can be tracked. The method has been successfully applied to the reduction of automobile noise.< >

关键词： Noise reduction Speech enhancement Design for manufacture Noise cancellation Hearing aids Adaptive filters signal processing Information processing computer science Minimization methods

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Efficient design and implementation of FIR filter banks with equal passband widths

Efficient design and implementation of FIR filter banks with...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： T. Saramaki J. Vidiscakova S.K. Mitra Signal Processing Laboratory Tampere University of Technology Tampere Finland Department of Electronics Slovak Technical University Bratislava Slovakia Department of Electrical and Computer Engineering University of California Santa Barbara CA USA

An approach is presented for efficiently designing and implementing FIR (finite impulse response) filter banks with equal passband bandwidths. The overall bank of L filters is generated from a prototype 2Lth-band filter with the aid of a few additional coefficients and adders. The attractive properties of these filter banks are that the sum of filter outputs is guaranteed to be a pure delay and the passband bandwidths are the same for all the filters.< >

关键词： Finite impulse response filter Passband Filter bank Band pass filters Prototypes Stacking Channel bank filters Transfer functions Bandwidth Delay

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Morphological processing of medical images: an introduction

Morphological processing of medical images: an introduction

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： D. Schonfeld Signal and Image Research Laboratory Department of Electrical Engineering and Computer Science University of Illinois Chicago Chicago IL USA

The theory of mathematical morphology is presented. The author introduces the basic morphological transformations and reviews some of their properties. He also summarizes the theory of morphological filtering. Several characteristics of mathematical morphology which demonstrate its applicability in the processing of medical images are outlined.< >

关键词： Biomedical imaging Morphology Psychology Humans Laboratories computer science Filtering theory Mathematics Data mining

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An adaptive-control-based noise cancellation approach

An adaptive-control-based noise cancellation approach

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： D. Graupe A. Efron Signal and Image Research Laboratory Department of Electrical Engineering and Computer Science University of Illinois Chicago Chicago IL USA

The authors outline a single (two-) microphone design of an ANC (adaptive noise cancellation) system that avoids prediction of colored noise, thus achieving the optimal prediction residual that is theoretically achievable. The design forces the colored acoustic noise to its inaccessible white generating sequence. The system, which is less sensitive to parameter estimation errors than previous approaches, is easily extended to an array of cancellation speakers. computer simulation results using actually recorded machine noise are presented to illustrate (simulated) system performance. Parameter sensitive analysis shows that the present design is far less sensitive to identification than are deterministic designs.< >

关键词： Noise cancellation Acoustic noise computer simulation Microphones Adaptive systems Colored noise Parameter estimation computer errors Loudspeakers Computational modeling

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Automatic neural arbor reconstruction

Automatic neural arbor reconstruction

引用

IEEE Symposium on Nuclear Science (NSS/MIC)

作者： P.M. Gregson Computer Vision and Image Processing Laboratory Department of Electrical Engineering Technical University of Nova Scotia Halifax NS Canada

An algorithm for detecting neural processes in serial optical sections for use in an automated three-dimensional neural reconstruction system is presented. This parsimonious, nonlinear, psychophysically motivated algorithm addresses the problems specific to neural element detection and localization, viz., images with minimal resolution, operators with small spatial supports, highly curved, filamentous features, large variation in feature intensity profile, poor signal-to-noise ratio, and determination of depth without stereo. One first finds the magnitude and orientation of the maximum intensity second directional derivative. A family of curves is locally fitted to these data, and the projections of the data on the curve family are found. If a pixel lies on a curve with sufficient total projection, it is labeled with the magnitude, orientation, curvature, spatial extent, and element displacement. Depth is interpolated from the spatial extent data for corresponding neighborhoods in three adjacent (in depth) images by using an approximation to the depth-dependent optical point spread function. Experimental results using photomicrographs of cat visual cortex are presented.< >

关键词： Image reconstruction computer vision Displays Spatial resolution Neural networks Nonlinear optics Optical interconnections Neurons Image processing Laboratories

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Reformulation of Chang's criterion for the absence of limit cycles using bilinear transform

Reformulation of Chang's criterion for the absence of limit ...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： T.C. Macedo T. Laakso P.S.R. Diniz I. Hartimo Department of Electrical Engineering Federal University of Rio de Janeiro (COPPE-EE) Rio de Janeiro Brazil Laboratory of Signal Processing and Computer Technology Helsinki University of Technology Espoo Finland

A procedure for the reformulation of Chang's criterion (1981) for the absence of zero-input limit cycles in recursive digital filters is presented. The technique employs the standard bilinear transform to convert a frequency-domain criterion into a polynomial form in terms of matrix transformations. The use of the method is illustrated with design examples applied to determine the stability region for certain single-quantizer recursive filter structures. The results can be utilized, e.g., in the design of an error feedback network for a given filter such that limit cycles are eliminated.< >

关键词： Limit-cycles Feedback Digital filters Stability criteria Paper technology Difference equations Frequency conversion Matrix converters Finite wordlength effects Adaptive filters

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Multichannel Givens lattice adaptive algorithm

Multichannel Givens lattice adaptive algorithm

引用

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

作者： K. Zhao F. Ling J.G. Proakis Communications and Digital Signal Processing Center Department of Electrical and Computer Engineering Northeastern University Boston MA USA Codex Corporation Mansfield MA USA

A multichannel Givens lattice algorithm is presented, which has a modular structure and is suitable for parallel implementation. The basic processing module requires a 2*2 plane rotation (Givens rotation), which has superior numerical properties due to its circular nature. The application of the multichannel Givens lattice algorithm to channel equalization is also discussed.< >

关键词： Lattices Adaptive algorithm signal processing algorithms Resonance light scattering Computational complexity Decision feedback equalizers State estimation Throughput Recursive estimation Partitioning algorithms

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