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 (4)
    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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  • Statistical signal processing for application to over-the-horizon radar

    Publication Year: 1994, Page(s):VI/113 - VI/116 vol.6
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    A review of recent developments in statistical signal processing for application to over-the-horizon radar (OTHR) is presented. Three different signal processing issues are considered. The first two issues relate to the radar interference characterisation, namely a Gaussianity test and a K-distribution test. The third issue relates to target detection in clutter based on rank tests. All techniques... View full abstract»

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  • A bootstrap approach to estimating fractal dimensions

    Publication Year: 1994, Page(s):VI/85 - VI/88 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    This paper outlines a bootstrap approach to estimating the “correlation dimension” of a fractal measure, from a set of observations on that measure. An important example is estimating the dimension of the attractor of a chaotic system from a set of observations on that system. The method reduces the effects of dependence among the observations, is stable to minor variations in the proc... 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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  • 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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  • Generating non-Gaussian random fields for sea surface simulations

    Publication Year: 1994, Page(s):VI/195 - VI/198 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    Sea surface simulations are needed to generate realistic glitter in Monte-Carlo testing of automatic target detection in electro-optical imagery of sea scenes. Glitter is determined by the sea surface's height and slope. At present sea surfaces are generally modelled as correlated random fields. Current algorithms for generating large realizations of random fields generally produce correlated Gaus... 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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  • A new WDF three-port adaptor suitable for floating-point arithmetic and/or DSP implementations

    Publication Year: 1994, Page(s):VI/17 - VI/20 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    A new decomposed version of three-port adaptors for wave digital filters (WDFs) is proposed, which is especially suitable for floating-point arithmetic and for implementation on digital signal processors (DSPs). By using the proposed three-port adaptor, the concept of modified wave digital filters (MWDFs) is appropriately extended to WDFs involving any n-port adaptors (n is integer). The resulting... View full abstract»

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  • Space and time statistical data processing in HF ionospheric sounding

    Publication Year: 1994, Page(s):VI/121 - VI/124 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    The paper describes spectral and correlation processing of the HF radio signals scattered by small scale ionospheric inhomogeneities (5 to 50 m in size). The measurements at frequencies above MUF were performed on single-hop midlatitude propagation paths. The probing signals from suitable broadcasting stations were received with small size dipole antennas and a highly directional large array, and ... View full abstract»

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  • High frequency atmospheric noise mitigation

    Publication Year: 1994, Page(s):VI/101 - VI/104 vol.6
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    The performance of high frequency (HF) radio communication and radar systems can be limited by noise generated by sources external to the receiving antenna. Below 10 MHz, atmospheric noise generated by worldwide thunderstorm activity tends to be the dominant natural source. We present an empirical analysis of atmospheric noise cancellation achieved by applying an adaptive sidelobe canceller to wid... 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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  • Location of a dragline bucket in space using machine vision techniques

    Publication Year: 1994, Page(s):VI/161 - VI/164 vol.6
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Because a dragline bucket's rigging is flexible, its position cannot be inferred from knowledge of rope length and boom position only. Moreover, active devices cannot be placed on the bucket itself to sense position because of the risk of damage. This paper describes a new machine vision system which is being developed to sense bucket position remotely. It is based on a single camera observing the... View full abstract»

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  • Wave digital filters for the migration of seismic data

    Publication Year: 1994, Page(s):VI/5 - VI/8 vol.6
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    A closed form design method for migration wave digital filters (MWDF) is presented. Migration filters are 2-D fan shaped filters with a prescribed nonlinear phase in the passband. An analytical solution is presented which solves simultaneously the approximation problems for attenuation and phase. The attenuation is approximated in a maximally flat sense in pass- and stopband. The phase of the idea... 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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  • 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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  • Processing of HF signals scattered by artificial ionospheric turbulence using fractal analysis

    Publication Year: 1994, Page(s):VI/169 - VI/171 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    An attempt has been made to apply fractal dimension analysis to HF radio signals scattered from natural and artificially stimulated ionospheric turbulence. Envelopes of the scattered signals in all cases showed a finite fractal dimension as estimated by the correlation integral technique. The signals scattered from artificial turbulence are characterized by a higher correlation dimension, while th... 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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  • Computing and signal processing: an experimental multidisciplinary course

    Publication Year: 1994, Page(s):VI/45 - VI/48 vol.6
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    In the Fall of 1993 at Berkeley we offered an experimental graduate course that focused on languages for modeling and design of signal processing systems. A major motivation for the course is our Ptolemy project, in which we are experimenting with models of computation and design methodology for signal processing systems. The applicable theory of computation primarily concerns stream datatypes and... View full abstract»

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  • A short history of the bootstrap

    Publication Year: 1994, Page(s):VI/65 - VI/68 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    A very brief account is given of the history of bootstrap methods in statistics, including early contributions made by Mahalanobis, Quenouille, Tukey, Barnard and Hartigan as well as Efron. The definition of bootstrap methods is addressed View full abstract»

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  • Exterior noise adaptive rejection for OTH radar implementations

    Publication Year: 1994, Page(s):VI/105 - VI/107 vol.6
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    A new class of nonstationary adaptive techniques is proposed to put up with clutter distortions originated from the current pattern readjustment, caused by the temporal perturbations of the jammer spatial covariance matrix. To introduce this approach we describe, by using the scalar-type vector-valued autoregressive model the inter-repetition sequence of the clutter-only antenna input snapshots ve... 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 (12)  |  Patents (5)
    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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  • 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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  • Stability verification of multidimensional Kirchoff circuits by suitable energy functions

    Publication Year: 1994, Page(s):VI/13 - VI/16 vol.6
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    Multidimensional (MD) Kirchoff circuits (MDKC) are introduced in the theory of MD wave digital filters (MDWDF) in order to develop the so-called reference networks. Since MDWDF principles have also been used for numerical integration of partial differential equations (PDE) having physical relevance, MDKCs have received new significance because they can be used as an equivalent alternative represen... 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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