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检索条件"任意字段=Conference on Advanced Signal Processing Algorithms"

共 3487 条记录，以下是3311-3320 订阅

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ULTRAWIDEBAND SAR CLUTTER SUPPRESSION BY AR SPECTRAL ESTIMATION

ULTRAWIDEBAND SAR CLUTTER SUPPRESSION BY AR SPECTRAL ESTIMAT...

引用

conference on algorithms for Synthetic Aperture Radar Imagery

作者： SHAW, SW SRI INT MENLO PKCA 94025

ISBN: (纸本)0819415340

Ultrawideband (UWB) SAR images often contain clutter and other types of spatially correlated noise. To reduce these effects, we have developed a complex, multichannel, autoregressive image- modeling and inverse-filtering algorithm. Our algorithm extends a previously reported technique to include complex image data and a solution to the directionality problem of 2D AR models. A multichannel image pixel, represented by a vector, is modeled as an autoregressive process with a nonsymmetric half-plane (NSHP) support region. The parameters of this NSHP AR model, represented as matrices, are estimated by minimizing a squared residual. To account for possible nonstationarity in the image statistics, the estimation is performed over a series of small subwindows, which lends a degree of adaptabtility to the algorithm. Once estimates of the complex AR parameter matrices are obtained, they are used in an inverse filter. To account for the directionality inherent in the NSHP filter, we have adopted a bi-directional filtering approach, with the results of the two filters combined such that targets are enhanced and clutter is minimized. This algorithm has been applied to various UWB SAR images and shown to be an effective whitening filter. The resulting signal-to-clutter enhancement depends on a variety of factors, including clutter statistics, target size, and AR model order. A version of the whitening algorithm has been incorporated into our standard set of tools for processing UWB SAR images.

关键词： Autoregressive models Synthetic aperture radar Image processing Detection and tracking algorithms Matrices Data modeling Algorithm development Image filtering Statistical analysis Image analysis

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Design and implementation of a multidimensional synchronous dataflow environment* 28

Design and implementation of a multidimensional synchronous ...

引用

28th Asilomar conference on signals, Systems and Computers, ACSSC 1994

作者： Chen, Michael J. Lee, Edward A. ViaSat Inc. 2290 Cosmos Court CarlsbadCA92009 United States Dept. of Electrical Engineering and Computer Science University of California at Berkeley BerkeleyCA94720 United States

ISBN: (纸本)0818664053

Multidimensional Synchronous Dataflow is a model of computation where functional blocks produce and consume data on a multidimensional index space. The model can express multidimensional signal processing systems and algorithms elegantly, and is able to reveal the data parallelism ofsuch systems in a way that raises possibilitiesfor better multiprocessor scheduling. We have formalized definitions and specijications for a two-dimensional model and have created a single-processor simulation domain in Ptolemy[l]. Our paper discusses the design issues and methodologies we used to eficiently handle the large amounts of two-dimensional data that the systems operate upon, The primary structures used were matrices to act as buffersand submatrices to access subsets of those buflers. © 1995 IEEE.

关键词： signal processing

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Low rate audio coder with hierarchical filterbanks and lattice vector quantization

Low rate audio coder with hierarchical filterbanks and latti...

引用

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

作者： P. Monta Shiufun Cheung Advanced Television and Signal Processing Group Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA

We describe a perceptual audio coder that employs nonuniform hierarchical filterbanks and entropy-coded lattice vector quantization. The nonuniform filterbanks present a good match to critical-band sampling, and they avoid the complications of block-size adjustment during signal transients. An entropy-coded lattice vector quantizer provides efficient quantization and coding of the filterbank samples. The coder achieves "transparent" quality at a rate of 96 kb/s, and efficient algorithms exist for the filterbank and vector quantizer subsystems.< >

关键词： Lattices Vector quantization TV signal processing HDTV Psychoacoustics Audio coding Acoustic noise signal processing algorithms Testing

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A New Buffer Control Strategy for Image Data Compression

A New Buffer Control Strategy for Image Data Compression

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IEEE International conference on Consumer Electronics (ICCE)

作者： Yoonho Kim Hansoo Kim Electronic Signal Processing Laboratory Institute for Advanced Engineering Seoul South Korea

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Laguerre transform for speech compression

Laguerre transform for speech compression

引用

IEEE Instrumentation and Measurement Technology conference

作者： A.K. Al Jabri S.A. Alshebeili Department of Electrical Engineering King Saud University Riyadh Saudi Arabia

Efficient techniques for speech compression are of practical interest. In this paper, a new compression algorithm based on Discrete Orthogonal Laguerre Functions (DOLFs) is proposed and analysed. Experimental results show that a good quality of the synthesized speech with a low bit rate representation is possible with a finite number of DOLFs basis.< >

关键词： Speech synthesis signal processing algorithms Frequency domain analysis Discrete transforms Algorithm design and analysis Bit rate Data communication Compression algorithms signal synthesis Digital signal processing

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Position-dependent encoding

Position-dependent encoding

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

作者： J. Apostolopoulos A. Pfajfer Hae Mook Jung J.S. Lim Advanced Television and Signal Processing Group Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA Massachusetts Institute of Technology Cambridge MA US Res. Lab. of Electron. MIT Cambridge MA USA

In typical MC-DCT compression algorithms, up to 90% of the available bit rate is used to encode the location and amplitude information of the nonzero quantized DCT coefficients. Therefore, efficient encoding of the location and amplitude information is extremely important for high quality video compression. In this paper we describe the position-dependent encoding (PDE) approach for encoding the DCT coefficients. This method attempts to exploit the inherent differences in statistical properties of the run-lengths and amplitudes as a function of position. This paper includes preliminary comparisons between the PDE scheme and conventional coding approaches. The PDE approach can be applied in any transform/subband filtering scheme for image or video compression.< >

关键词： Encoding Discrete cosine transforms Video compression Entropy signal processing algorithms Filtering TV Bit rate Laboratories Compression algorithms

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APPLYING ELECTROOPTICAL SPACE SURVEILLANCE TECHNOLOGY TO THE DETECTION OF NEAR-EARTH ASTEROIDS 8

APPLYING ELECTROOPTICAL SPACE SURVEILLANCE TECHNOLOGY TO THE...

引用

8th SPIE conference on Instrumentation in Astronomy

作者： TENNYSON, PD RORK, EW KOSTISHACK, DF MIT LINCOLN LABLEXINGTONMA 02173

ISBN: (纸本)081941493X

The electro-optical space surveillance (EOSS) technology program at MIT/Lincoln Laboratory develops advanced electro-optical technology for space and missile surveillance. This advanced technology includes visible CCD focal plane arrays and cameras, mid-wave IR (MWIR) Shottky barrier focal planes and cameras, and the detection processing algorithms and processors to optimize the use of these focal plane arrays. Some of these EOSS technologies are highly suited to the detection of faint near earth objects. A near-earth asteroid surveillance system has been designed to utilize recently developed technology and existing telescopes to meet the performance requirements outlined in the NASA SPACEGUARD Study (Morrison, 1992). A detailed model was developed to evaluate the expected detection performance of this system and the proposed Spaceguard system. The components of the designed system have been tested as part of routine device evaluation and field measurements. Results indicate that the proposed system can meet the performance objectives spelled out in the spaceguard study at lower cost and risk than the proposed spaceguard system and with existing technology.

关键词： Space telescopes Sensors Telescopes Asteroids Imaging systems Aerospace engineering Surveillance Cameras Performance modeling signal to noise ratio

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On channel estimation for RAKE receiver in a mobile multipath fading channel

On channel estimation for RAKE receiver in a mobile multipat...

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

作者： Fu Li Heng Xiao Jin Yang Department of Electrical Engineering Portland State University Portland OR USA Sharp Microelectronics Technologies Inc. Camas WA USA

ISBN: (纸本)0780317750

Multipath fading is one of the major practical concerns in wireless communications. Multipath problem always exists in the mobile environment, especially for a mobile unit which is often embedded in its surroundings. The RAKE receiver has been used to reduce the multipath fading in a wideband spread spectrum mobile system. However, the tap weights of the multipath channel model need to be estimated. We explore the possibility of using advanced signal processing algorithms to estimate the multipath channels and propose a least-squares approach to tap weight estimation based on chip rate channel estimates to investigate the performance of the RAKE receiver in a realistic mobile environment. Simulations show that the new approach outperforms the existing approaches.< >

关键词： Fading Channel estimation Multipath channels Delay lines signal processing signal detection Mobile communication Reflection signal processing algorithms Microelectronics

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Parallel architecture for universal digital signal processing

Parallel architecture for universal digital signal processin...

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Annual Hawaii International conference on System Sciences (HICSS)

作者： V.K. Jain H. Hikawa Department of Electrical Engineering University of South Florida Tampa FL USA Department of Computer & Sc. and Intelligent Sys. Oita University Oita Japan

The paper describes a parallel architecture for universal digital signal processing. This architecture uses not only multiply-accumulate but also nonlinear operations, such as reciprocal, squareroot, exponential, sine/cosine, etc. Several advanced algorithms can thus be mapped to this array architecture. Specifically, the paper focuses attention on two very diverse algorithms, namely the fast Fourier transform and the matrix LU decomposition. Only two types of cells are used in the architecture; these are the Universal Multiply-Subtract-Add cell (UMSA) and the Universal Nonlinear cell (UNL). Both MA and nonlinear operations are performed in hardware, so that the operation times are on the order of chip-clock cycle times. The use of only two types of cells makes the architecture highly suitable for wafer scale integration. It is interesting to note that the same resources on the wafer are used for configuring it to either the FFT algorithm or the LU decomposition algorithm.< >

关键词： Parallel architectures Digital signal processing signal processing algorithms Computer architecture Pipelines Hardware Wafer scale integration Application software Image processing Fast Fourier transforms

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LAMPS MK III block II simulation for advanced algorithm development

LAMPS MK III block II simulation for advanced algorithm deve...

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conference on Digital Avionics Systems (DASC)

作者： J. Boyd T. Butash W. Grizzle R. Taylor Lord Federal Systems-Owego Manassas USA

This paper provides a description of a simulation being developed as a testbed for the development and performance evaluation of multiple Multi-Sensor Correlation (MSC) algorithms. The selected application platform is the U.S. Navy LAMPS MK III Helicopter Avionics System. This system will undergo a major modification, the Block II Upgrade, which includes enhanced sensor subsystem and processing capabilities that will ultimately incorporate advanced operator assistance algorithms, with an emphasis on MSC.< >

关键词： Lamps Object oriented modeling signal processing algorithms Narrowband Acoustic emission Surveillance Sonar Target tracking Oceans Displays

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