检索结果-内蒙古大学图书馆

International conference on Pattern Recognition

作者： C.H. Chu Center for Advanced Computer Studies University of Southwestern Louisiana Lafayette USA

The standard wavelet transform can be considered to be a subtree of a complete multiresolution binary tree, in which each branch corresponds to a decomposition step. Any subtree of this multiresolution tree which covers all leaves is a valid wavelet packet processing tree, which specifies the processing steps for a wavelet decomposition of the original data. The present paper describes an adaptation scheme for configuring a wavelet packet processing tree using a genetic algorithm search of the complete multiresolution tree. Data compression is used as the target signal processing task. Trees are configured for different compression rates, and performance is measured based on the reconstruction distortion. Performances are validated using testing as well as training data; the performance of the configured trees are compared to that of the standard wavelet transform.

关键词： Genetic algorithms Wavelet packets signal resolution Wavelet transforms Binary trees Data compression signal processing algorithms Distortion measurement Performance evaluation Testing

来源：评论

学校读者我要写书评

暂无评论

Image coding using adaptive recursive interpolative DPCM with entropy-constrained trellis coded quantization

Image coding using adaptive recursive interpolative DPCM wit...

引用

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

作者： E.A. Gifford B.R. Hunt M.W. Marcellin Department of Electrical and Computer Engineering University of Arizona Tucson Tucson AZ USA

A predictive image coder having minimal decoder complexity is presented. The image coder utilizes recursive interpolative DPCM in conjunction with adaptive classification, entropy-constrained trellis coded quantization, and optimal rate allocation to obtain signal-to-noise ratios in the range of the most advanced transform coders.< >

关键词： Image coding Decoding Quantization Interpolation Optical filters Pixel signal to noise ratio Wavelet transforms Prediction algorithms Discrete cosine transforms

来源：评论

学校读者我要写书评

暂无评论

Sounds on least-squares four-parameter sine-fit errors due to harmonic distortion and noise

Sounds on least-squares four-parameter sine-fit errors due t...

引用

IEEE Instrumentation and Measurement Technology conference

作者： J.P. Deyst T.M. Souders O.M. Solomon National Institute for Standards and Technology Gaithersburg MD USA Sandia National Laboratories Albuquerque NM USA

Least-squares sine-fit algorithms are used extensively in signal processing applications. The parameter estimates produced by such algorithms are subject to both random and systematic errors when the record of input samples consists of a fundamental sine wave corrupted by harmonic distortion or noise. The errors occur because, in general, such sine-fits will incorporate a portion of the harmonic distortion or noise into their estimate of the fundamental. Bounds are developed for these errors for least-squares four-parameter (amplitude, frequency, phase, and offset) sine-fit algorithms. The errors are functions of the number of periods in the record, the number of samples in the record, the harmonic order, and fundamental and harmonic amplitudes and phases. The bounds do not apply to cases in which harmonic components become aliased.< >

关键词： Harmonic distortion Acoustic noise Parameter estimation signal processing algorithms Frequency estimation Least squares methods Laboratories Amplitude estimation Additive noise Solids

来源：评论

学校读者我要写书评

暂无评论

Pipelined median filters

Pipelined median filters

引用

IEEE Instrumentation and Measurement Technology conference

作者： L. Breveglieri V. Piuri Department of Electronics and Information Politecnico di Milano Milano Italy

Several DSP algorithms need to remove high-frequency or impulsive noise while preserving edges, e.g., in speech and image processing applications: median filtering has been proved more effective to achieve this goal than other filtering techniques. Efficient architectural implementation for real-time applications involves a careful VLSI design, which takes into account modularity, regularity, adaptability, throughput, circuit complexity, and fault tolerance. Two new architectural approaches are presented in this paper to deal with different application and implementation constraints: the pipelined polarizing median filter and the pipelined sorting median filter.< >

关键词： Filters Digital signal processing Filtering algorithms Circuit noise Speech enhancement Speech processing Image processing Very large scale integration Throughput Complexity theory

来源：评论

学校读者我要写书评

暂无评论

Correlation techniques for digital time-of-flight measurement by airborne ultrasonic rangefinders

Correlation techniques for digital time-of-flight measuremen...

引用

Proceedings of IEEE/RSJ International conference on Intelligent Robots and Systems (IROS'94)

作者： A.M. Sabatini E. Spinielli Advanced Robotics Technology and Systems Laboratory Pisa Italy

Ultrasonic pulse-echo ranging systems based on threshold detection methods are popular devices in the robotic field, as a means for determining the proximity of objects in a cost-effective manner. Despite their widespread use, serious concerns are often raised regarding the accuracy of the sensed data, particularly when the return signals are received at low signal-to-noise ratios. In principle, correlation-based detection methods provide better performance for their outstanding capability of detecting and recovering weak signals buried in noise, so as to permit ranging at longer distances, or, the distance being the same, at higher frequencies, with resulting improvements in spatial resolution in spite of the increased attenuation. In this paper the authors describe a simple pulse-echo ranging system whose receiver signal processing is completely digital: the use of appropriate sampling techniques and signal processing algorithms allows one to benefit from the advantages of correlation-based detection methods for accurate ranging of multiple objects, without compromising the most prominent features of pulse-echo sonar systems, namely their relatively low cost and simplicity of operation. The experimental results presented concern the use of relatively high-frequency ultrasonic transducers.< >

关键词： Object detection signal processing algorithms Sonar detection Ultrasonic variables measurement Robot sensing systems signal to noise ratio Frequency Spatial resolution Attenuation Digital signal processing

来源：评论

学校读者我要写书评

暂无评论

A longitudinal multi‐bunch feedback system using parallel digital signal processors

引用

AIP conference Proceedings 1994年第1期319卷 283-292页

作者： L. Sapozhnikov J. D. Fox J. J. Olsen G. Oxoby I. Linscott A. Drago M. Serio Stanford Linear Accelerator Center Stanford California 94309 INFN Laboratori Nazionali Frascati Italy

A programmable longitudinal feedback system based on four AT&T 1610 digital signal processors has been developed as a component of the PEP‐II R&D program. This longitudinal quick prototype is a proof of concept for the PEP‐II system and implements full‐speed bunch‐by‐bunch signal processing for storage rings with bunch spacings of 4 ns. The design incorporates a phase‐detector‐based front end that digitizes the oscillation phases of bunches at the 250 MHz crossing rate, four programmable signal processors that compute correction signals, and a 250‐MHz hold buffer/kicker driver stage that applies correction signals back on the beam. The design implements a general‐purpose, table‐driven downsampler that allows the system to be operated at several accelerator facilities. The hardware architecture of the signal processing is described, and the software algorithms used in the feedback signal computation are discussed. The system configuration used for tests at the LBL advanced Light Source is presented.

关键词：

来源：评论

学校读者我要写书评

暂无评论

An SPWD-based instrument for accurate spectral analyses

An SPWD-based instrument for accurate spectral analyses

引用

IEEE Instrumentation and Measurement Technology conference

作者： G. Andria N. Sabia M. Savino Dipartimento di Elettrotecnica ed Elettronica Politecnico di Bari Bari Italy

The Wigner-Ville distribution (WD) is particularly used for time-frequency analysis of non-stationary signals. This paper proposes the application of the smoothed version of the WD to design an innovative virtual instrument (VI) which can be used as a spectral analyzer. Our work focuses on the computational algorithms that meet several essential requirements for implementation, such as high time-frequency resolution, precision, flexibility, and computational efficiency. An original interpolation formula is derived, to overcome the negative effects due to leakage. Following this, a simple WD implementation on the designed VI is proposed and a series of numerical checks is shown, to suitably characterize the new instrument.< >

关键词： Instruments Spectral analysis Frequency estimation Interference Time frequency analysis signal processing algorithms Interpolation signal processing Sampling methods Distributed computing

来源：评论

学校读者我要写书评

暂无评论

Prosodic phrase segmentation by pitch pattern clustering

Prosodic phrase segmentation by pitch pattern clustering

引用

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

作者： H. Shimodaira M. Nakai Japan Advanced Institute of Science and Technology Nomi Japan University of Tohoku Sendai Japan

This paper proposes a novel method for detecting the optimal sequence of prosodic phrases from continuous speech based on data-driven approach. The pitch pattern of input speech is divided into prosodic segments which minimized the overall distortion with pitch pattern templates of accent phrases by using the One Pass search algorithm. The pitch pattern templates are designed by clustering a large number of training samples of accent phrases. On the ATR continuous speech database uttered by 10 speakers, the rate of correct segmentation was 91.7% maximum for the same sex data of training and testing, 88.6% for the opposite sex.< >

关键词： Pattern clustering Speech processing Humans Speech recognition Clustering algorithms Databases Testing Gratings Natural languages Stress

来源：评论

学校读者我要写书评

暂无评论

Architectural design simulation and silicon implementation of a very high fidelity decimation filter for sigma-delta data converters

Architectural design simulation and silicon implementation o...

引用

IEEE Instrumentation and Measurement Technology conference

作者： I. Kale R.C.S. Morling A. Krukowski D.A. Devine University of Westminster London UK

This paper reports on results from the algorithmic design and simulation of a two-path poly-phase decimation filter with 24-bit accuracy over the frequency range from dc to approximately 16 kHz. The filter is suited for very high precision data conversion applications, and has been designed for use with a fourth-order /spl Sigmaspl Delta/ modulator running at 4096 kHz. This paper also reports on the fixed-point architectural design, comparative bit-level simulations and silicon implementation.< >

关键词： Silicon Finite impulse response filter Digital filters Baseband Algorithm design and analysis Digital signal processing Passband signal processing algorithms signal resolution Filtering

来源：评论

学校读者我要写书评

暂无评论

A fuzzy framework for distributed sensor data processing

A fuzzy framework for distributed sensor data processing

引用

IEEE Instrumentation and Measurement Technology conference

作者： H. Odeberg Department of Physics and Measurement Technology Liverpool of Polytechnic Sweden

In this paper, a unified approach towards the integration of sensor data is presented. Using a modified recursive least squares algorithm, variations in parameter location and measurement noise may be tracked. The introduction of fuzzy logic, and the subsequent development of operators especially suited for sensor integration, enables sensors of radically different nature to be combined in a consistent manner.< >

关键词： Data processing Sensor systems signal processing algorithms Histograms Noise measurement Fuzzy logic Probability Fuzzy sets Physics Statistical distributions

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：