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[Proceedings] ICASSP-92: 1992 IEEE International Conference on Acoustics, Speech, and Signal Processing

23-26 Mar 1992

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Displaying Results 1 - 25 of 174
  • Fast computation of the Wigner distribution for finite-length signals

    Publication Year: 1992, Page(s):177 - 180 vol.5
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    L. Cohen's class (1989) of time-frequency distributions (TFDs), which includes the spectrogram and Wigner distribution (WD), has been widely used to analyze a variety of signals, including EMGs, EEGs, sonar data and speech. The WD is noted for its ability to localize mono-component signals in time and frequency, and, other than the spectrogram, is perhaps the most often-used TFD. An approach for t... View full abstract»

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  • Distributions for time-frequency analysis: a generalization of Choi-Williams and the Butterworth distribution

    Publication Year: 1992, Page(s):181 - 184 vol.5
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The authors generalize the Choi-Williams (1989) time-frequency exponential distribution (ED) and propose the Butterworth distribution (BUD). The kernels of both act as 2-D lowpass filters in the ambiguity function plane with variable filter characteristics. Increasing the order parameters results in flatter passbands and narrower transition regions, approaching ideal lowpass filters. The scaling p... View full abstract»

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  • Discrete representation of continuous signals: the Huggins transform

    Publication Year: 1992, Page(s):5 - 8 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The discrete representation of continuous linear time-invariant signal processing systems is discussed. The orthogonal Huggins representation is introduced as an important special case of the discrete orthogonal representation. This representation uses an orthogonalized collection of complex exponentials as the orthogonal basis. Additionally, the Huggins representation of continuous linear time-in... View full abstract»

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  • Inductive techniques for formal verification of systolic array designs in DSP applications

    Publication Year: 1992, Page(s):573 - 576 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    It is shown how several inductive techniques can be utilized to provide fast and efficient proofs to the correctness of systolic designs in digital signal processing (DSP) applications. These techniques exploit the repeatability, regularity, and locality nature of systolic arrays and algorithms in DSP to produce fast proofs independent of the array size. How inductive techniques can be applied to ... View full abstract»

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  • Optimal minmax estimation and the development of minmax estimation error bounds

    Publication Year: 1992, Page(s):285 - 288 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    It is often desired to create an optimal estimator of some parameter θ given the observation x. However, the relationship between θ and x may depend on another parameter φ which is unknown to the processor and not of direct interest. In this case, an estimator which performs well for one value of φ may perform poorly for another value of φ. One approach to... View full abstract»

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  • On inherent in-place and in-order features of the prime factor algorithm

    Publication Year: 1992, Page(s):9 - 12 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    For the computation of the prime factor algorithm (PFA), an in-place and in-order approach is always desirable because it reduces the memory requirement for the storage of the temporary results, and the computation time which is required to unscramble the output sequence to a proper order. In fact, the processing time required for this unscrambling process can take up as much as 50% of the overall... View full abstract»

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  • Generation and implementation of DSP parallel programs from a signal processing design environment

    Publication Year: 1992, Page(s):577 - 580 vol.5
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    Multiprocessor digital signal processing systems are an effective medium for implementing high-speed real-time signal processing algorithms. While multiprocessor systems are becoming widely available, software for generating multiprocessor code is not as easily obtainable. Although the general problem of generating multiprocessor schedules is a difficult one, parallel schedules for digital signal ... View full abstract»

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  • Total least squares with linear constraints

    Publication Year: 1992, Page(s):341 - 344 vol.5
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Numerically stable closed form expressions for the solution of the total least squares (TLS) problem with linear equality constraints (LCTLS) are derived. A constrained subspace linear predictive frequency estimation technique called LCTLS-linear predictive (LCTLS-LP) is proposed. The method is suited for scenarios where the presence of a known frequency component makes it difficult to resolve a c... View full abstract»

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  • Resolution analysis and enhancement of the eigenspace based rooting method of source localization

    Publication Year: 1992, Page(s):265 - 268 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    An effective approach to resolution enhancement of rooting methods of source localization is introduced. An approach to the statistical analysis of rooting methods is also introduced, and this approach is used to derive signal-root variance and bias expressions which are accurate for SNR down to the resolution threshold region. Simulation results are presented to verify the analysis, illustrating ... View full abstract»

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  • Application of the Dirichlet transform in analysis of nonuniformly sampled signals

    Publication Year: 1992, Page(s):25 - 28 vol.5
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The authors introduce a method of spectrum analysis based on a Dirichlet transform which generalizes the Z-transform and is better suited to the analysis of nonuniformly sampled signals. The Dirichlet spectrum preserves information about sampling instants because a nonuniformly sampled signal is not treated as a sequence of samples but as a function of the sampling instants. Basic propert... View full abstract»

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  • Bearing estimation in a colored noise background using the method of multiple windows

    Publication Year: 1992, Page(s):385 - 388 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    D.J. Thomson's method of multiple-windows (see Proc. IEEE, vol.70, p.1055-96, 1982) is applied to the problem of bearing (angle-of-arrival) estimation, at low grazing angles, in the combined presence of specular and diffuse multipath. The specular multipath component is coherently related to the direct signal component, both within a beamwidth of each other. They are modeled as line components in ... View full abstract»

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  • Optimal automatic periodic multiprocessor compiler for multi-bus networks

    Publication Year: 1992, Page(s):593 - 596 vol.5
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    The theory and performance of a deterministic, optimal synchronous compiler for multiprocessor systems with a multibus interconnection network are presented. This compiler takes an algorithm described by a flow graph and produces realizations that meet traditional optimality criteria. These realizations are implemented on a multiprocessor system with the minimum number of buses possible. The compi... View full abstract»

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  • Displacement rank of pseudo-inverses

    Publication Year: 1992, Page(s):49 - 52 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    The concept of displacement rank can be defined in a general framework, and turns out to be a useful tool for revealing hidden structures in matrices. When a n×n matrix is structured, it can be described by O(n) parameters. Manipulations of linear systems can then be carried out with much less storage and computational requirements. It is known that the in... View full abstract»

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  • Time delay estimation for filtered Poisson processes using an EM-type algorithm

    Publication Year: 1992, Page(s):289 - 292 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    A modified expectation-maximization (EM) algorithm is used to estimate the time delay τ of the intensity λ(t-τ) of an inhomogeneous Poisson process Nt, whose points are only partially observed as a noise contaminated output X(t) of a linear time-invariant filter excited by a train of delta functions: a filtered Poisson process. A modifi... View full abstract»

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  • A maximal invariant framework for adaptive detection with arrays

    Publication Year: 1992, Page(s):357 - 360 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    A framework for exploring array detection problems in a reduce dimensional space by exploiting the theory of invariance in hypothesis testing is introduced. This involves calculating a low-dimensional basis set of functions called the maximal invariant, the statistics of which are often tractable to obtain, thereby making analysis feasible and facilitating the search for tests with some optimality... View full abstract»

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  • Least squares channel estimation for a channel with fast time variations

    Publication Year: 1992, Page(s):165 - 168 vol.5
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    It is shown how to improve the tracking properties of least squares (LS) estimation for a time-variant channel estimation (system identification) problem by introducing a parametric time-variant model instead of the conventional model, which is a constant impulse response in each iteration. A recursive LS algorithm is developed for the case that the model varies linearly with time. Simulation resu... View full abstract»

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  • New algorithms for the FFT computation of symmetric and translational complex conjugate sequences

    Publication Year: 1992, Page(s):13 - 16 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    A previously proposed algorithm for the FFT (fast Fourier transform) computation of real symmetric and antisymmetric sequences reduced the N-point symmetric FFT computation to a N/4-point complex FFT computation, but the postprocessing involved division by sin(2πk/N). For large size N, this may cause stability problems. An algorithm is presented whic... View full abstract»

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  • A compiler for multiprocessor DSP implementation

    Publication Year: 1992, Page(s):581 - 584 vol.5
    Cited by:  Papers (5)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    McDAS, a software environment designed to support the real-time implementation of digital signal processing (DSP) applications onto multiple processors, is described. Users program their algorithms as they would on a single processor, and McDAS automatically schedules and compiles the program onto the target multiprocessor. The scheduler maximizes the computational throughput by simultaneously con... View full abstract»

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  • Detection of the number of signals using predictive stochastic complexity

    Publication Year: 1992, Page(s):345 - 348 vol.5
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    A new algorithm for the processing of signals by an array of sensors is proposed. The objective is to find the number and the directions of arrival (DOA) of signals impinging on a linear array. The predictive stochastic complexity criterion of Rissanen (1986) is used to select the best model order. To reduce the computational load, the algorithm operates with a suboptimal estimator while maintaini... View full abstract»

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  • Schur parametrization of symmetric matrices with any rank profile

    Publication Year: 1992, Page(s):269 - 272 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The conceptual solution to the parametrization problem for symmetric indefinite matrices P is addressed. Beyond the fact that the symmetric matrix to be parametrized may have positive, negative and vanishing eigenvalues, it may as well comprise singular leading submatrices. For the parametrization, the lossless inverse scattering (LIS) framework is employed, which amounts to the mapping o... View full abstract»

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  • Use of the Gabor representation for Wigner distribution crossterm suppression

    Publication Year: 1992, Page(s):29 - 31 vol.5
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    The Wigner-Ville (WV) distribution has found favor in the processing of unknown or partially known signals because of its ability to portray the time-frequency distribution of signal energy. Signal independent methods for crossterm suppression of multicomponent signals, based on the crossterm-deleted representation, are discussed. In coupling the methods of Gabor and Wigner-Ville, effective crosst... View full abstract»

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  • Spectral estimation based on AR-model excited by t-distribution process

    Publication Year: 1992, Page(s):521 - 524 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    A new spectral estimation method is proposed. Since in the least square L2 method the obtained estimates are very much affected by the large signal portions, in the proposed method a loss function which assigns large weighting factor for the small residual portions and vice versa is used. The loss function is based on an assumption that the residual signal has an identical and ... View full abstract»

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  • Silicon compilation of video-rate digital filters

    Publication Year: 1992, Page(s):613 - 616 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    The design and implementation of a silicon compiler system for video-rate digital filters are presented. The compiler is capable of mapping arbitrary linear filters, given in the form of a ratio of polynomials in Z-1 or signal flow graph, into compact VLSI layouts. Filters from actual video processing systems are synthesized to demonstrate the effectiveness of the compiler View full abstract»

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  • Statistical evaluation of beam-space direction-of-arrival estimators

    Publication Year: 1992, Page(s):389 - 392 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    The beam-space performance of DOA estimation is analyzed for several subspace processing algorithms in a unified fashion based on a finite amount of measurements. The mean-squared errors (MSE) of DOA estimation of these algorithms are expressed in a single formula using physical parameters like array manifold and beamformer matrix. The important relationship between MSE and dimension of beam-space... View full abstract»

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  • A group-theoretic framework for fault-tolerant computation

    Publication Year: 1992, Page(s):557 - 560 vol.5
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    A general technique for protecting computation with systematic-separate codes is presented. These codes use parity symbols to check the result of computation. A group-theoretic approach and model computation are used as operations in an algebraic group. It is shown that in order for a code to commute with computation, it must define a homomorphism between the original group and the group of parity... View full abstract»

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