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IEEE Transactions on Signal Processing

Issue 6 • Date June 1992

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Displaying Results 1 - 25 of 41
  • Correction to 'Comments on 'A curiosum concerning discrete time convolution',' plus a remark

    Publication Year: 1992
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (83 KB)

    In the author's comments to an article by Hall and Wise (see ibid., vol.38, no.6, p.1059, 1990) included a typographic error which is corrected. He also points out that the sequences used in the example become L/sub 1/ norm sequences.<> View full abstract»

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  • Context modeling with the stochastic segment model

    Publication Year: 1992, Page(s):1584 - 1587
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    An approach for context modeling in continuous speech recognition for models based on multivariate Gaussian distributions, specifically, the stochastic segment model, is described. Robust context models are obtained by typing distribution parameters across different classes of context. Experimental results in phoneme and word recognition are comparable to those achieved with discrete hidden Markov... View full abstract»

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  • Fully sigma-delta modulation encoded FIR filters

    Publication Year: 1992, Page(s):1605 - 1610
    Cited by:  Papers (24)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The author suggests an FIR filter structure where both the input signal and the impulse response are encoded using sigma-delta modulation. As a result, the convolution can be obtained by summing a collection of binary or ternary numbers, depending on the quantizer in the sigma-delta modulator. This filter structure can accept analog input signals directly and can be built using modular hardware. T... View full abstract»

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  • Calculating the FHT in hardware

    Publication Year: 1992, Page(s):1341 - 1353
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1004 KB)

    A parallel, pipelined architecture for calculating the fast Hartley transform (FHT) is discussed. Hardware implementation of the FHT introduces two challenges: retrograde indexing and data scaling. A novel addressing scheme that permits the fast computation of FHT butterflies is proposed, and a hardware implementation of conditional block floating point scaling that reduces error due to data growt... View full abstract»

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  • A novel two-stage algorithm for DCT and IDCT

    Publication Year: 1992, Page(s):1610 - 1612
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    On the basis of the Mobius function, a two-stage algorithm for the discrete cosine transform (DCT) and the inverse DCT (IDCT) is proposed. In this approach, the DCT matrix is factorized into the preprocessing and postprocessing matrices. The preprocessing matrix has elements of values 1 and -1, and the postprocessing matrix is a circular convolution/correlation matrix View full abstract»

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  • Efficient order recursive algorithms for multichannel least squares filtering

    Publication Year: 1992, Page(s):1354 - 1374
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1412 KB)

    Four efficient order-recursive algorithms for least-squares (LS) multichannel FIR filtering and multivariable system identification are developed. The need for such algorithms arises when the system model assigns an unequal number of delay elements to each input channel. All proposed schemes provide considerable improvements over overparametrization or the zero padding approach. First, a block-str... View full abstract»

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  • Spectral distortion in sampling rate conversion by zero-order polynomial interpolation

    Publication Year: 1992, Page(s):1576 - 1579
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    For such applications as digital beamforming in sonar and sampling rate conversion in digital audio systems, there is interest in fast, approximate interpolation techniques. Computationally, the simplest of these is to approximate the desired time series sample by the available sample which is nearest in time. This procedure is variously known as sample-and-hold interpolation, zero-order polynomia... View full abstract»

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  • An adaptive detector for deterministic signals in noise of unknown spectra using the Rao test

    Publication Year: 1992, Page(s):1460 - 1468
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    An adaptive detector for a known deterministic signal of unknown amplitude in Gaussian noise of unknown spectra is described. The detector is based on the Rao test, which is asymptotically equivalent to the generalized likelihood ratio. The detector achieves constant false alarm probability in the presence of large changes in input noise bandwidth and variance while providing optimum detection per... View full abstract»

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  • An updating algorithm for subspace tracking

    Publication Year: 1992, Page(s):1535 - 1541
    Cited by:  Papers (97)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    In certain signal processing applications it is required to compute the null space of a matrix whose rows are samples of a signal with p components. The usual tool for doing this is the singular value decomposition. However, the singular value decomposition has the drawback that it requires O(p3) operations to recompute when a new sample arrives. It is shown t... View full abstract»

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  • Digital filters as absolute norm regularizers

    Publication Year: 1992, Page(s):1548 - 1562
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1016 KB)

    A variational formulation of the digital filtering problem, based on a certain regularizing functional, is presented. In particular, the special case where the regularizing functional is defined by means of l1-norm is considered and a characterization of its minima is presented. It is shown that, for a certain class of signals, one solution to the regularization problem can be ... View full abstract»

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  • Gain-adapted hidden Markov models for recognition of clean and noisy speech

    Publication Year: 1992, Page(s):1303 - 1316
    Cited by:  Papers (29)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1184 KB)

    In applying hidden Markov modeling for recognition of speech signals, the matching of the energy contour of the signal to the energy contour of the model for that signal is normally achieved by appropriate normalization of each vector of the signal prior to both training and recognition. This approach, however, is not applicable when only noisy signals are available for recognition. A unified appr... View full abstract»

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  • Linear bispectrum of signals and identification of nonminimum phase FIR systems driven by colored input

    Publication Year: 1992, Page(s):1469 - 1479
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (872 KB)

    The identification of non-minimum-phase finite-impulse-response (FIR) systems driven by third-order stationary colored signals that are not linear processes is addressed. Modeling the linear part of the bispectrum of a signal is discussed. The bispectrum of a signal is decomposed into two multiplicative factors. The linear bispectrum is defined as the factor of the bispectrum that can exactly be m... View full abstract»

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  • On unique localization of constrained-signals sources

    Publication Year: 1992, Page(s):1542 - 1547
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    Conditions for unique localization of radiating sources by passive sensor arrays are presented. Unlike in previous analyses, the case wherein the signals are constrained to certain loci in the complex plane is addressed. Two types of constraints are considered. The first includes the case of constant-amplitude signals and the second includes the case of complex-exponential signals. The conditions ... View full abstract»

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  • Polynomial array for F(z1, z 2) on |z1|=1 and 2-D filter stability test

    Publication Year: 1992, Page(s):1579 - 1581
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    A polynomial array for a complex polynomial F(z 1, z2) on |z1|=1 is developed to overcome the difficulty in the implementation of some algebraic methods for the 2-D filter stability test. A simple and systematic algorithm to construct this polynomial array is given. The algorithm removes the requirement for conjugate polynomials ... View full abstract»

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  • A neural network model for invariant pattern recognition

    Publication Year: 1992, Page(s):1595 - 1599
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    A neural network is proposed to achieve invariant pattern recognition to binary inputs based on a computation of the invariance net and the ART1 neural network. Computer simulations show that the new network is plastic to unfamiliar inputs and requires no explicit training of the inputs View full abstract»

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  • Adaptive code excited predictive coding

    Publication Year: 1992, Page(s):1317 - 1326
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (740 KB)

    A novel way to use the code excited linear prediction (CELP) concept that decreases the processing load while keeping the same speech quality is discussed. Rather than performing individual weighting of each candidate sequence, a global implementation of the perceptual weighting function at the codebook level is proposed. As a result, the analysis-by-synthesis procedure does not require the proces... View full abstract»

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  • Signal detection in a multiple time delay environment

    Publication Year: 1992, Page(s):1587 - 1590
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    Signal detection methods for an uncertain multipath environment are described. The multipath transmission channel is modeled considering a different transfer function from the source to each hydrophone of the receiving array. The signal-to-noise ratio (SNR) is assumed to be low. Based on a simple example, which is given together with Monte Carlo simulation results, the statistical behavior of the ... View full abstract»

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  • On focusing matrices for wide-band array processing

    Publication Year: 1992, Page(s):1295 - 1302
    Cited by:  Papers (53)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    A general class of transformation matrices for coherent signal-subspace processing is presented. These signal-subspace transformation (SST) matrices are shown to generate a sufficient statistic for maximum-likelihood bearing estimation. Two general forms for calculating SST matrices are presented, and the rotational signal-subspace (RSS) focusing matrices proposed by H. Hung and M. Kaveh (1988) ar... View full abstract»

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  • Design of windows with steerable sidelobe dips

    Publication Year: 1992, Page(s):1452 - 1459
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    Based on the frequency sampling method, a novel and simple window design technique was established upon three theorems. The technique produces a set of windows which have simple expressions and the steerable sidelobe-dip (SSLD) property. By steering the dips in the sidelobes, it is easy to reduce the edge of the mainlobe, or to minimize the height of sidelobes, or to create a `hole' in the sidelob... View full abstract»

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  • Recursive autoregressive spectral estimation by minimization of the free energy

    Publication Year: 1992, Page(s):1518 - 1527
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (700 KB)

    A digital signal processing technique applicable to power spectrum estimation, designated as the minimum free energy method, is described. With no a priori model assumption and no attempt to extract special features such as sinusoids, one can obtain high resolution even with high noise contamination of the measured signal. The technique is demonstrated by modification of the Burg recursive method ... View full abstract»

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  • Tracking of a time-varying acoustic impulse response by an adaptive filter

    Publication Year: 1992, Page(s):1285 - 1294
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (748 KB)

    A simple model is set up describing roughly the change of an acoustic impulse response if an object moves through a room. From this model, specifications can be formed regarding the length and convergence rate of an adaptive filter trying to track this change. It is shown that in many practical applications an adaptive filter would not perform better than the optimal fixed filter. Next, a more acc... View full abstract»

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  • Digital filters for attenuating interference arriving from a wide range of angles

    Publication Year: 1992, Page(s):1499 - 1507
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    Digital filters for the offline multichannel processing of the signals recorded by an array of sensors are derived with the objective of extracting a desired signal arriving from a known direction. Both the desired signal and coherent interference have arbitrary waveforms. Since the direction of arrival of the interference is unknown, the array response to it is treated as a random variable, and t... View full abstract»

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  • Cartesian hidden Markov models with applications

    Publication Year: 1992, Page(s):1601 - 1604
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    The author introduces the concept of a Cartesian hidden Markov model (CHMM), which consists of a Markov chain assuming values in the Cartesian product of a finite number of elementary state sets. The states are observed via a multivariable probabilistic mapping, again assuming values in a Cartesian product of finite sets of observables. The CHMM can be reduced to an ordinary (i.e., scalar) HMM by ... View full abstract»

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  • Uniform approximation with doubly finite Volterra series

    Publication Year: 1992, Page(s):1438 - 1442
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The assumption that a system possesses a certain discrete-time Volterra series representation frequently forms the basis for studies in the areas of signal processing and communication theory. A further assumption often made, always without discussion, is that the representation can be suitably approximated by a corresponding `double finite' series. It is shown that, for a very large class of nonl... View full abstract»

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  • An adaptive array robust to beam pointing error

    Publication Year: 1992, Page(s):1582 - 1584
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The authors propose an algorithm that is robust to beam pointing error. In the algorithm, the weight vector of a beam steered adaptive array corresponds to the maximum eigenvector of a data covariance matrix which is filtered by the projection operator composed of the eigenvectors of noise subspace of the covariance matrix in which the desired signal is removed by subtractive preprocessing. The re... View full abstract»

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Aims & Scope

IEEE Transactions on Signal Processing covers novel theory, algorithms, performance analyses and applications of techniques for the processing, understanding, learning, retrieval, mining, and extraction of information from signals

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Meet Our Editors

Editor-in-Chief
Sergios Theodoridis
University of Athens