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Acoustics, Speech, and Signal Processing, 1994. ICASSP-94., 1994 IEEE International Conference on

19-22 April 1994

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  • Bootstrap sampling applied to image analysis

    Publication Year: 1994, Page(s):VI/81 - VI/84 vol.6
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (359 KB)

    We present the bootstrap sampling techniques applied to some pattern recognition algorithms. Two important procedures in image analysis are tested: a statistical segmentation based on expectation-maximisation (EM) family algorithms and two methods of invariant features extraction for gray level images. In the first case, the results we obtain show that the bootstrap sample selection method gives b... View full abstract»

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  • Engineering education for the 21st century

    Publication Year: 1994, Page(s):VI/33 - VI/36 vol.6
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The engineering environment of the 21st century will require new engineers to handle ambiguity and chaos, to understand the design/process/manufacture path for a product, to balance independence and teamwork, and to combine the techno-scientific base with a societal context. This paper summarizes some of the specific activities and experiments currently underway at universities in the United State... View full abstract»

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  • The Signal Processing Information Base project: the present and the future

    Publication Year: 1994, Page(s):VI/37 - VI/40 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The Signal Processing Information Base (SPIB) represents an attempt by the Signal Processing Society to make generally available information-data, papers, software, and bibliographies-necessary for state-of-the-art research and development. Access to the repository relies on the Internet, which makes SPIB available to students, researchers, and developers around the world. The variety of informati... View full abstract»

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  • An update on the CMU virtual laboratory

    Publication Year: 1994, Page(s):VI/53 - VI/56 vol.6
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    The ECE department at CMU has implemented a new integrated curriculum which emphasizes learning in the context of applications. Development of a new laboratory paradigm has been critical to maximize conceptual learning while minimizing student busy work and faculty laboratory maintenance. The resulting virtual laboratory paradigm and redesign of the fundamental signals and systems course was the s... View full abstract»

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  • Bootstrapping coherency function

    Publication Year: 1994, Page(s):VI/77 - VI/79 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (132 KB)

    In estimating spectrum and coherency function smoothing techniques have been widely used. However, smoothing creates undesirable bias consequently. We suggest the bootstrap method for the estimation of the bias and propose a bias-corrected estimator. Confidence bands are also considered by using a bootstrap estimate of the standard deviation. Simulation study are carried out for two cases View full abstract»

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  • DSP and communication engineering education with graphical block diagram simulation tools

    Publication Year: 1994, Page(s):VI/57 - VI/60 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Graphical block diagram simulation tools with highly interactive plotting and visualization capabilities can accelerate and greatly improve DSP and communications education. In this paper, we present several projects given in graduate and senior level undergraduate courses in DSP and communications which use the graphical simulation tool Capsim, and emphasize the importance of true multi-rate sign... View full abstract»

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  • Adaptive wave digital fan filters

    Publication Year: 1994, Page(s):VI/25 - VI/28 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    Adaptive two-dimensional (2-D) fan filters based on least mean square algorithm and 2-D wave digital filter structure are presented. The weight updating equations as well as the equations for computing the gradient components of signals in two-dimensional wave digital filter adaptors are derived and specifically applied to wave digital quadrant and narrowband fan filters. Computer simulations are ... View full abstract»

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  • Feature representations for monitoring of tool wear

    Publication Year: 1994, Page(s):VI/137 - VI/140 vol.6
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    We address the general problem of reliable, real-time detection of faults in metal-removal processes in manufacturing. As has long been recognized by skilled machine operators, mechanical and acoustic vibrations can be reliable sources of cues for such monitoring. However, conventional dull-tool monitoring systems, which are generally based on stationary signal processing methods, are inadequate f... View full abstract»

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  • Real time implementation of HMM speech recognition for telecommunications applications

    Publication Year: 1994, Page(s):VI/145 - VI/148 vol.6
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    This paper describes an implementation of connected word recognition using commercially available parallel processing DSPs. The recognition system uses continuous density HMMs for speaker independent recognition over a public switched network. It describes how the computationally intensive functions can be optimised for efficient real time implementation. Results of recognition accuracy are presen... View full abstract»

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  • Shape estimation and self-noise analysis for towed arrays

    Publication Year: 1994, Page(s):VI/153 - VI/155 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    Towed line arrays of hydrophones are used in the underwater environment to detect weak signals, to resolve closely-spaced contacts and to estimate the bearing and other properties of acoustic sources. The detection performance of a towed array is limited by its self-noise. Towed array data are processed using an adaptive spatial filtering technique implemented in the frequency domain. The resultin... View full abstract»

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  • The processing of HF skywave radar signals

    Publication Year: 1994, Page(s):VI/165 - VI/168 vol.6
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    This paper presents an overview of a significant and computationally demanding application of signal processing, viz. over-the-horizon radar (OTHR). The Jindalee Operational Radar Network is an integrated network of OTHRs which depend heavily for their performance, in both air and surface mode, on signal processing. It outlines the characteristics of OTHR data that need to be recognised in the des... View full abstract»

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  • Signal processing of sky wave OTH-B radar

    Publication Year: 1994, Page(s):VI/117 - VI/120 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The design technique of signal processing of sky wave OTH-B radar is presented as well as 3D treatments in space, time and frequency domains and their performances. The technical insurance of a bistatic synchronization system and the characteristic of signal processing when detecting ship targets are reported briefly. The performances of a subarray are tested through several groups of experimental... View full abstract»

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  • Multidimensional wave-digital principles: from filtering to numerical integration

    Publication Year: 1994, Page(s):VI/173 - VI/181 vol.6
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (868 KB)

    Wave-digital principles, originally developed for one-dimensional filtering purposes, have later been extended to multidimensional filtering applications and have been shown to be applicable also to numerical integration of physically relevant ordinary and partial (thus multidimensional) differential equations of linear and nonlinear type. They are based on physical concepts such as Kirchhoff circ... View full abstract»

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  • The design and development of an undergraduate signal processing laboratory

    Publication Year: 1994, Page(s):VI/41 - VI/44 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    The School of Electrical and Electronic Systems Engineering of Queensland University of Technology (like many other universities around the world) has recognised the importance of complementing the teaching of signal processing with computer based experiments. A laboratory has been developed to provide a “hands-on” approach to the teaching of signal processing techniques. The motivatio... View full abstract»

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  • Phase correction of an HF multireceiver antenna array using a radar transponder

    Publication Year: 1994, Page(s):VI/125 - VI/128 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    We present the method we used to calibrate the multireceiver antenna array of the HF backscatter radar located at Valensole (43°48'N, 6°06'E) in south France. During the first experiment with the new receiving equipment the internal phase calibration procedure, using an injected signal, did not work correctly because of hardware problems in the antenna system, so we decided to use the sign... View full abstract»

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  • An overview of multiple-window and quadratic-inverse spectrum estimation methods

    Publication Year: 1994, Page(s):VI/185 - VI/194 vol.6
    Cited by:  Papers (11)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    Presents examples, history, and a brief review of the theory of multiple-window and quadratic-inverse spectrum estimation methods for mixed harmonizable processes. In addition to the standard uses of making consistent non-parametric auto- and cross-spectrum estimates with jackknife confidence intervals and estimating periodic components in coloured noise, quadratic-inverse theory gives a time-freq... View full abstract»

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  • Bootstrapping autoregressions with infinite order

    Publication Year: 1994, Page(s):VI/97 - VI100 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    We consider a stationary autoregressive process of infinite order and discuss bootstrap procedures for the autocovariance function and the spectral density. After fitting an autoregressive process of increasing order to the observed data and estimating the parameter of the process we obtain estimated residuals. Now we construct an autoregressive bootstrap process with innovations which are distrib... View full abstract»

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  • Numerical investigation of the Euler equations by means of wave digital filters

    Publication Year: 1994, Page(s):VI/1 - VI/4 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    A fluid dynamic system can be described by nonlinear partial differential equations (PDEs). Well suited for simulation purposes is a discrete passive dynamic system, which can be found using principles known from the theory of multidimensional (MD) wave digital filters (WDF). All major features of the original physical system (e.g. massive parallelism, local interdependencies, MD-passivity etc.) a... View full abstract»

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  • Signal processing education in the French system

    Publication Year: 1994, Page(s):VI/61 - VI/63 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    This paper investigates the French system of signal processing education. At first a general description of the French system of electrical engineering education is presented. Then the particular case of signal processing studies is described by using an example of one of the French universities View full abstract»

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  • A review of signal processing education in Scotland

    Publication Year: 1994, Page(s):VI/29 - VI/32 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    This paper presents a background to the teaching of Signal Processing in Scottish universities, identifies commonality of undergraduate teaching programmes and contents, provides information on the key teaching syllabuses and on the relevant advanced final year options, as well as on postgraduate instructional courses. It also comments on current trends and future directions, and ends by posing a ... View full abstract»

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  • “Digital signal processing with applications:” a new and successful approach to undergraduate DSP education

    Publication Year: 1994, Page(s):VI/49 - VI/52 vol.6
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The new approach to undergraduate DSP education at Purdue is based on a simple idea: emphasize applications. Students are assumed to have a significant exposure to sampling and discrete-time signals, systems, and transforms at the junior level. In the senior course, the traditional DSP topics of digital filter design, the DFT, radix-2 FFT's, and quantization are covered in the first five weeks of ... View full abstract»

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  • Discrete modelling of plasma equations with ion motion using technique of wave digital filters

    Publication Year: 1994, Page(s):VI/21 - VI/24 vol.6
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    This paper shows how to solve a system of plasma equations consisting of Euler's and Maxwell's equation systems by using technique of wave digital filters. Since, in plasmas, the electromagnetic effect superposed in addition to the effect of thermal motion in the fluid, both Kirchhoff circuits derived from the equation systems have to be connected each other, which are transformed into well-known ... View full abstract»

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  • Gaussian mixture model classifiers for machine monitoring

    Publication Year: 1994, Page(s):VI/133 - VI/136 vol.6
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    We describe a statistical pattern-recognition approach to machine monitoring. The approach comprises a classification scheme using Gaussian mixture models (GMMs) that classifies features based on a time-frequency representation using the wavelet transform. The GMM trained with the EM algorithm has comparable flexibility with the multilayered perceptron in modeling nonstationary, multimodal machine... View full abstract»

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  • A closed form design method for recursive 3-D cone filters

    Publication Year: 1994, Page(s):VI/141 - VI/144 vol.6
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    A closed form design method for recursive 3-D cone filters is presented. The filters are realized by concrete passive 3-D wave digital filter (WDF) structures leading to the associated desirable properties of multidimensional WDF. The proposed method is accomplished analytically without the need for time consuming numerical optimization techniques. In contrast to previously reported methods, which... View full abstract»

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  • A statistical model for the simulation of time-varying multipath mobile radio propagation channel

    Publication Year: 1994, Page(s):VI/149 - VI/152 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    We propose a new model for the mobile radio channel which takes into account the channel non-stationarity. It is a statistical model whose parameters are derived from real impulse responses. It is based on modelling the variations of an existing stationary model when moving through small areas within which stationarity can be assumed. The stationary model used was developed in earlier work and con... View full abstract»

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