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1996 IEEE Digital Signal Processing Workshop Proceedings

1-4 Sept. 1996

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Displaying Results 1 - 25 of 133
  • 1996 IEEE Digital Signal Processing Workshop Proceedings

    Publication Year: 1996
    Request permission for commercial reuse | PDF file iconPDF (636 KB)
    Freely Available from IEEE
  • Critical band quantisation analysis for masked distortion speech coding

    Publication Year: 1996, Page(s):165 - 168
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    This paper presents new results on critical band masked distortion controlled quantisation of a linear transform representation of speech. In particular, fixed rate split vector quantisation of a critical band gain vector is investigated. While shown to be objectively significant in meeting masked distortion criteria, near-transparent quantisation of the critical band gain spectrum is nonetheless ... View full abstract»

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  • Sub-band, dual-channel adaptive noise cancellation using normalised LMS

    Publication Year: 1996, Page(s):327 - 330
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (517 KB)

    An adaptive noise cancellation scheme for speech processing is described. Adaptive filters are implemented in sub-bands, based on a model of the human cochlea. A modification to the LMS structure is introduced which guarantees stability and convergence. This modification, a non-recursive normalisation, is used both in a wideband and in a sub-band implementation of the scheme. The effect of this no... View full abstract»

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  • Author index

    Publication Year: 1996, Page(s):519 - 521
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    Freely Available from IEEE
  • Towards optimal LPC spectral parameters estimation in standard CELP 4800 b/s speech coder

    Publication Year: 1996, Page(s):161 - 164
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The influence of nonuniform scalar quantization and the specific interpolation procedure of LSP parameters, as proposed in USA FED STD 1016 CELP 4800 b/s speech coder, to the LPC spectra of speech obtained by using four standard LPC methods: autocorrelation with Hamming window, covariance, modified covariance and lattice, is considered. Comparative experimental analysis is done referring to the re... View full abstract»

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  • Multirate modeling of human ear frequency resolution for hearing aids

    Publication Year: 1996, Page(s):157 - 160
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    A real-time multirate filtering design project, as an application in digital hearing aids, has been developed. The motivation is that it allows nonuniform frequency resolution which automatically leads us to use different decimators for different frequency bandwidths. Therefore, a variation of the tree structured multirate multistage filter bank is exploited with six pairs of polyphase filters for... View full abstract»

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  • Correlation analysis of ultrasonic speckle for motion estimation

    Publication Year: 1996, Page(s):211 - 214
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    Synthetic aperture techniques permit low-cost ultrasonic imaging systems, but are susceptible to motion artifacts. Motion compensation is crucial in imaging of non-stationary structures. In this study, correlation analysis of ultrasonic speckle signals for correlation based motion estimation is presented. Correlation measurements with different system parameters, such as the subaperture size, inte... View full abstract»

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  • Subband seismic data compression: optimization and evaluation

    Publication Year: 1996, Page(s):65 - 68
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (556 KB)

    A variable-length subband coder for seismic stack sections is presented. A parallel FIR filter bank is optimized to maximize the coding gain, while securing perfect reconstruction in the absence of quantization, assuming that the correlation properties of stack sections can be modelled by a separable autoregressive process. The entropy coding scheme, based on uniform quantization and dynamic arith... View full abstract»

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  • The effect of modified filter distribution on an adaptive, sub-band speech enhancement method

    Publication Year: 1996, Page(s):153 - 156
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    An adaptive noise cancellation scheme for speech processing is described, in which adaptive filters operate in frequency-limited sub-bands. Previously the filters had been distributed in a linear fashion in the frequency domain. This work investigates the effects of spacing the filters more in sympathy with the signal power and spectral characteristics. It is found that improvements in signal-to-n... View full abstract»

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  • Correlation performance of chaotic signals in spread spectrum systems

    Publication Year: 1996, Page(s):506 - 509
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    The performance of chaotic sequences used in direct sequence spread spectrum (DS/SS) communications is assessed. It is demonstrated that this method leads to an improvement in signal detection performance over traditional spreading techniques. Other advantages of using chaotic dynamical systems for such applications are presented View full abstract»

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  • Maximally fast, bit-serial lattice wave digital filters

    Publication Year: 1996, Page(s):207 - 210
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    An approach to schedule lattice wave digital filters so that the maximal sample frequency is obtained is presented. In the approach, bit-serial arithmetic and a scheduling method that decouples the sample period from the scheduling period are used. A lower bound on the scheduling period required to arrive at the minimum sample period is given. Different latency models for the arithmetic operations... View full abstract»

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  • Optimal hierarchical decompositions for signals coded using Lloyd-Max quantizers

    Publication Year: 1996, Page(s):81 - 84
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Optimal hierarchical coding is sought, for progressive or scalable image transmission, by minimizing the variance of the error difference between the original image and its lower resolution renditions. The optimal, according to the above criterion, pyramidal and subband image coders are determined for images quantized using the optimal vector Lloyd-Max quantizers. A rigorous statistical model of a... View full abstract»

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  • Wavelets in dynamics, optimal control and Galerkin approximations

    Publication Year: 1996, Page(s):409 - 412
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    We give the explicit time description of the following nonlinear (polynomial) problems: dynamics and optimal dynamics for some important electromechanical system, Galerkin approximation for beam equation, and detecting chaos in the Melnikov approach. We present the solution in a compactly supported wavelet basis. The solution is parameterized by solutions of two reduced algebraical problems, the f... View full abstract»

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  • Efficient adaptive filtering in subbands using IIR filter banks

    Publication Year: 1996, Page(s):61 - 64
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    This paper deals with a structure for implementing adaptive filters using orthogonal, lossless filter banks. Previously, only FIR filter banks have been used for this structure. We demonstrate that also computationally efficient IIR filter banks can be used even if the adaptive filter to be implemented is an FIR filter. We show that the computational advantages obtained using IIR filters do not le... View full abstract»

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  • Noniterative reconstruction of band limited signals and coding techniques

    Publication Year: 1996, Page(s):149 - 152
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    In this paper we propose linear iterative and noniterative algorithms which can efficiently correct a subset of t samples of a signal, whose values might have been corrupted, possibly due to noise, clipping, or any other reasons. We discuss the applicability of techniques used in error correcting codes to this problem, and the possibility of determining the location of the erroneous samples in ove... View full abstract»

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  • A new approach to piecewise linear modeling of time series

    Publication Year: 1996, Page(s):502 - 505
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    Due to the inherent non-linearity and non-stationarity of a wide class of time series, nonlinear models have been the object of an increasing interest over the past years. Piecewise linear models, in which a linear sub-model is associated with each region of a state-space decomposition, have been proposed as an attractive alternative to threshold autoregressive models. However, it is still unclear... View full abstract»

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  • A parallel architecture for adaptive frequency-domain Volterra filtering

    Publication Year: 1996, Page(s):203 - 206
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    A parallel-serial implementation for an adaptive nonlinear Volterra filter, which exploits the symmetric properties of kernels in the frequency domain, is presented. The realization is based on the successive generation of the m-th order frequency domain of the kernel definition in terms of lower order domains. An efficient implementation structure of the frequency-domain adaptive filters is prese... View full abstract»

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  • Joint distributions of arbitrary variables made easy

    Publication Year: 1996, Page(s):394 - 397
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    The successful application of joint time-frequency distributions to problems in time-varying spectral analysis has stimulated considerable interest in distributions of other variables for use when a strict time-frequency analysis is not appropriate. Joint distributions generalise single variable distributions that measure the energy content of some physical quantity in a signal. We propose a new f... View full abstract»

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  • Nonlinear-phase maximally-flat lowpass FIR filter design

    Publication Year: 1996, Page(s):374 - 377
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    This paper reports a new analytic technique for the design of nonlinear-phase maximally-flat lowpass FIR filters. By subjecting the response magnitude and the group delay (individually) to differing numbers of flatness constraints, a new family of filters is obtained. With these filters, the delay can be reduced while maintaining relatively constant group delay in the passband, without significant... View full abstract»

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  • 2D shape analysis base on perceptual hierarchy

    Publication Year: 1996, Page(s):223 - 226
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    A novel approach for the recognition of 2D shapes is presented based on the perceptual organization of descriptive-boundary primitives of objects. The system has three components: (1) a set of partition and grouping rules for extracting and manipulating the primitives, (2) a control structure of the processes and (3) a representation scheme based on a perceptual hierarchy View full abstract»

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  • Fractal and linear pyramids

    Publication Year: 1996, Page(s):77 - 80
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    Pyramids are data structures with multiresolution information that have been applied successfully on many image processing and analysis tasks. We compare the properties of fractal and linear pyramids. The relations between the levels of a fractal pyramid are studied, generalising the results obtained by Baharav et al. (see Fractal Compression: Theory and applications to Digital Images, chapter 5, ... View full abstract»

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  • Discrete orthogonal transforms based on Fibonacci-type recursions

    Publication Year: 1996, Page(s):405 - 408
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    The idea of unified Fibonacci-type topology is used for construction of wide classes of discrete orthogonal transforms, including Rademacher-Fibonacci, Walsh-Fibonacci, Haar-Fibonacci-type transforms, etc. Efficient algorithms for proposed transforms directly related with the generalized Fibonacci topology are derived. The generation of discrete wavelets and wavelet packets based on Fibonacci-type... View full abstract»

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  • Entropy coding of composite sources modeled by infinite Gaussian mixture distributions

    Publication Year: 1996, Page(s):235 - 238
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    A method for optimizing a multiple entropy coder system for coding of a memoryless mixture distribution is studied. The coding scheme is based on splitting the composite source into a finite number of subsources, followed by entropy coding of each subsource. A rate distortion optimal splitting scheme is found assuming an infinite Gaussian mixture distribution and one common infinite-level uniform ... View full abstract»

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  • Robust subband video coding with leaky prediction

    Publication Year: 1996, Page(s):57 - 60
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    The use of leaky prediction in a video transmission system designed for noisy channels is investigated. For the proposed system, graceful degradation is achieved by finding good index maps between the quantized source coder parameters and the amplitude levels of a QAM signal constellation. The paper, however, investigates the use of leaky prediction to further increase the robustness to channel no... View full abstract»

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  • A two-band linear-phase QMF lattice with an improved robustness to coefficient quantization

    Publication Year: 1996, Page(s):145 - 148
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    In this paper we examine the design problem of a new lattice structure for two-band perfect reconstruction filter banks with linear phase analysis and synthesis filters. The aim is to provide sets of lattice coefficients which are robust to quantization. Two complementary methods are presented which are key elements to derive low dynamic range solutions while satisfying given frequency specificati... View full abstract»

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