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1995 International Conference on Acoustics, Speech, and Signal Processing

9-12 May 1995

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Displaying Results 1 - 25 of 226
  • Ocean acoustic tomography experiment using a vertical array

    Publication Year: 1995
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (49 KB)

    Summary form only given. An acoustic tomography experiment, supported by European MAST contracts, has been carried out in the all occidental Mediterranean sea. During 10 months in 1994, acoustic phase shift keying signals have been emitted at a pulse rate of 1 per 4 hours and received by seven sources-receivers localized in the all basin and spaced by several hundred kilometers. In addition, signa... View full abstract»

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  • Algorithm-based low-power transform coding architectures

    Publication Year: 1995, Page(s):3267 - 3270 vol.5
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (391 KB)

    In most low-power VLSI designs, the supply voltage is usually reduced to lower the total power consumption. However, the device speed will be degraded as the supply voltage goes down. In this paper, we propose new algorithmic-level techniques for compensating the increased delays based on the multirate approach. We will show how to compute most of the discrete sinusoidal transforms through the dec... View full abstract»

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  • Signals and signal processing for acoustic monitoring of ocean processes

    Publication Year: 1995, Page(s):2767 - 2770 vol.5
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    Systems for bistatic monitoring of ocean processes differ radically from monostatic systems searching for targets. The paper discusses basic principles,showing how these effect signal design, signal processing goals and signal processing techniques. In addition, computer advances have a strong influence in changing signal processing choices, sometimes rendering yesterday's optimums today's curiosi... View full abstract»

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  • A user-friendly system for microphone array research

    Publication Year: 1995, Page(s):3015 - 3018 vol.5
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    Describes the design and use of a digital acoustic array signal processing research environment. The system unites the interactive numerical processing capabilities of The MathWorks' MATLAB with multichannel data acquisition/signal processing hardware and an overhead Cartesian robot for accurate sound source placement. In conjunction with additional electronic and electromechanical peripherals, th... View full abstract»

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  • Space-time adaptive processing for airborne radar

    Publication Year: 1995, Page(s):2809 - 2812 vol.5
    Cited by:  Papers (24)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Advanced airborne radar systems are required to detect targets in the presence of both clutter and jamming. Ground clutter is extended in both angle and range, and is spread in Doppler frequency because of the platform motion. Space-time adaptive processing (STAP) refers to the simultaneous processing of the signals from an array antenna during a multiple pulse coherent waveform. STAP can provide ... View full abstract»

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  • Cramer-Rao bounds for matched field tomography and ocean acoustic tomography

    Publication Year: 1995, Page(s):2763 - 2766 vol.5
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Matched field and ocean acoustic tomography concern the estimation of parameters for models of ocean environments using acoustics. Both require full field representations for the observed signals since waveguide effects are important. The authors present Cramer-Rao lower bounds for the attainable accuracy of both methods. These bounds are expressed in terms of the Green's function for the propagat... View full abstract»

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  • Multi-scale signal feature processing for automatic, objective vehicle noise and vibration quality analysis

    Publication Year: 1995, Page(s):2959 - 2962 vol.5
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    The paper describes a new signal processing technique for understanding the dynamics of time-varying signals in vehicles: hyperstate analysis. Vehicle noise and vibration are examples of randomly-varying transient or non-stationary signals that are not effectively analyzed with classical spectral analysis techniques. By the use of nested hidden Markov models, hyperstate analysis explicitly identif... View full abstract»

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  • A new adaptive intersubband tap-assignment algorithm for subband adaptive filters

    Publication Year: 1995, Page(s):3051 - 3054 vol.5
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    This paper proposes a new subband adaptive filtering algorithm with intersubband tap assignment. The number of taps for each subband adaptive filter is adaptively controlled based on a sum of squared coefficients to the impulse-response tail of the unknown system. The sum is weighted by the input reference signal power to reflect its power imbalance. For rapid convergence of intersubband tap assig... View full abstract»

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  • High resolution analysis of bird sounds

    Publication Year: 1995, Page(s):3011 - 3014 vol.5
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Bird songs and calls have been studied using modern signal processing techniques in both time and frequency domains. The complex modulations of these natural sounds are interpreted by a popular bioacoustic model of avian sound production. High resolution signal processing techniques have been applied to the problem of dual-voice detection within bird sounds. Improved time and frequency analyses of... View full abstract»

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  • Robust material identification in hyperspectral data via multiresolution wavelet techniques

    Publication Year: 1995, Page(s):2805 - 2808 vol.5
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    Reviews the characteristics of hyperspectral imaging sensors and describes several important data exploitation applications in remote sensing. The authors then focus on a particular signal processing application, material identification, and propose a novel algorithm based on multiresolution wavelet techniques. Finally, they demonstrate the multiresolution material identification algorithm on data... View full abstract»

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  • Lane detection for automotive sensors

    Publication Year: 1995, Page(s):2955 - 2958 vol.5
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The paper addresses the problem of detecting lane boundaries in color images of road scenes acquired from a car mounted visual sensor. It is shown that the lane boundaries in such images have to obey a set of global constraint equations. All images with such constrained lanes are modeled via deformable templates. The observed image is related to the underlying lane boundary features through a like... View full abstract»

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  • Optimization of an acoustic echo canceller combined with adaptive gain control

    Publication Year: 1995, Page(s):3047 - 3050 vol.5
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    This contribution deals with the application of hands-free algorithms in wide-band telephone systems with limited computing resources. The basis is the combination of an acoustic echo canceller and an adaptive gain control method. The paper describes how the effect of the echo canceller can be optimized without increasing the computational expense. This is achieved by extending the length of the a... View full abstract»

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  • Multi-channel deconvolution using Pade approximation

    Publication Year: 1995, Page(s):3007 - 3010 vol.5
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    A new approach of estimating acoustic transfer functions from multi-channel reverberant signals is proposed. The ratio of two transfer functions is approximated by a polynomial by estimating one reverberant signal from another using least mean square estimation. Each transfer function is then estimated using Pade approximation. Two criteria are used to search for the most appropriate pair of trans... View full abstract»

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  • Interferometric synthetic aperture radar for terrain mapping

    Publication Year: 1995, Page(s):2801 - 2804 vol.5
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    The paper describes a new technique for topographic mapping using an interferometric synthetic aperture radar (IFSAR). The IFSAR utilizes microwave interference for precise measurement of small linear displacements related to the surface topography. It is similar to a traditional SAR system except that it has two receive antennas (with essentially the same boresight) and the single recording chann... View full abstract»

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  • Memory/time optimization of 2-D filters

    Publication Year: 1995, Page(s):3223 - 3226 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    Two-dimensional filters are commonly used in digital image processing applications. These filters have the characteristic of processing recursive sets of instructions requiring high computational speed. These sets are modeled as cyclic two-dimensional data flow graphs, which are also used to represent the equivalent circuit design. In this new method, such graphs are submitted to a multi-dimension... View full abstract»

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  • EM algorithm for estimating the parameters of a multivariate complex Rician density for polarimetric SAR

    Publication Year: 1995, Page(s):3651 - 3654 vol.5
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    A polarimetric synthetic aperture radar (SAR) forms a complex vector-valued image where each pixel comprises the polarization-dependent reflectivity of a portion of a target or scene. The most common statistical model for this type of image is the zero-mean, circularly-symmetric, multivariate, complex Gaussian model. A logical generalization of this model is a circularly-symmetric, multivariate, c... View full abstract»

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  • A comparative study of multiple tests based techniques for optimal sensor location for knock detection

    Publication Year: 1995, Page(s):2951 - 2954 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    A comparative study of techniques for finding optimal sensor positions in a group of vibration sensors for knock detection in spark ignition engines is presented. The methods assume the transmission of the acoustical oscillations in the combustion chamber to the engine housing to be time invariant and linear. Based on this model, suitable multiple tests have been performed to reject sequentially i... View full abstract»

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  • Hidden process modeling

    Publication Year: 1995, Page(s):2935 - 2938 vol.5
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    Presents a method that is a generalization of hidden Markov modeling for the situations where elementary events cannot be clearly defined. A family of fuzzy sets, induced on a temporal universe, is used to model the dynamic trajectory of a physical system as a collection of hidden processes that coexist at the same time, but to different degrees. An algorithm based on unsupervised pattern recognit... View full abstract»

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  • Coupled adaptive filters for acoustic echo control and noise reduction

    Publication Year: 1995, Page(s):3043 - 3046 vol.5
    Cited by:  Papers (14)  |  Patents (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    Presents new adaptive algorithms for acoustic echo control and noise reduction which employ one, two, or possibly more microphone signals. The new algorithms accommodate high echo attenuation and lead to implementations with reduced complexity. These algorithms combine a conventional FIR echo canceller with a second NLMS-adapted FIR filter which attenuates residual echoes. The paper presents a one... View full abstract»

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  • Time series data in geophysics/space physics

    Publication Year: 1995, Page(s):2895 - 2898 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Most geophysical and space physics data have time as one of the key variables in the data acquisition and subsequent analysis. Generally, in order to achieve physical understanding of these data, it is necessary to carry out comprehensive time series analyses. The paper outlines briefly the driving sources that produce time variability in many space and geophysical systems. It then discusses time ... View full abstract»

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  • Wavelet-based noise reduction

    Publication Year: 1995, Page(s):3003 - 3006 vol.5
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    A novel method for enhancement of noisy speech is presented. Frames of speech samples are split into low and high frequency bands and projected onto a library of bases consisting of local trigonometric functions and wavelet packets. Coefficients thought to represent only the speech are selected by means of the minimum description length (MDL) criterion, and used to synthesize an estimate of the or... View full abstract»

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  • Efficient geometric transformations and 3-D image registration

    Publication Year: 1995, Page(s):2919 - 2922 vol.5
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    Presents a general framework for the fast, high quality implementation of geometric affine transformations of images (p=2) or volumes (p=3), including rotations and scaling. The method uses a factorization of the p×p transformation matrix into p+1 elementary matrices, each affecting one dimension of the data only. This yields a separable implementation through an appropriate sequence of 1-D ... View full abstract»

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  • Calculation of the sample selection probabilities of stack filters by using weighted Chow parameters

    Publication Year: 1995, Page(s):3403 - 3406 vol.5
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    In the present work weighted Chow parameters are developed with the aim of their application in the statistical analysis of a class of nonlinear filters, namely stack filters, which are specified by positive Boolean functions (PBF) representing the binary output at each threshold level of the continuous-valued signal. Selection probabilities of stack filters were defined based on the fact that the... View full abstract»

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  • Improved analysis of remote sensed data using combined physical and engineering approaches

    Publication Year: 1995, Page(s):2797 - 2800 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    The accurate analysis of complex satellite scenes is a critical component of many environmental studies. Unfortunately, satellite data often contain noise of various kinds which can compromise scientific analysis. Moreover, a satellite scene generally contains information on many different space scales associated with a variety of geophysical and/or biogeochemical processes. Thus, an accurate segm... View full abstract»

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  • Discriminative training of self-structuring hidden control neural models

    Publication Year: 1995, Page(s):3379 - 3382 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    This paper presents a new training algorithm for self-structuring hidden control neural (SHC) models. The SHC models were trained non-discriminatively for speech recognition applications. Better recognition performance can generally be achieved, if discriminative training is applied instead. Thus we developed a discriminative training algorithm for SHC models, where each SHC model for a specific s... View full abstract»

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