By Topic

IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 4 • Date April 1989

Filter Results

Displaying Results 1 - 24 of 24
  • Performance analysis of a null-steering algorithm based on direction-of-arrival estimation

    Publication Year: 1989, Page(s):461 - 466
    Cited by:  Papers (32)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (470 KB)

    A two-step null-steering algorithm is considered. The first step consists of estimating the directions of arrival of all wavefronts impinging on a sensor array. The second step consists of forming nulls in the estimated directions of the interferers, while maximizing the received signals. A first-order performance analysis is carried out, leading to an asymptotic formula for the output interferenc... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Pitch prediction filters in speech coding

    Publication Year: 1989, Page(s):467 - 478
    Cited by:  Papers (56)  |  Patents (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1243 KB)

    Prediction error filters which combine short-time prediction (formant prediction) with long-time prediction (pitch prediction) in a cascade connection are examined. A number of different solution methods (autocorrelation, covariance, Burg) and implementations (transversal and lattice) are considered. It is found that the F-P cascade (formant filter before the pitch filter) outperforms the P-F casc... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On causal linear phase IIR digital filters

    Publication Year: 1989, Page(s):479 - 484
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (458 KB)

    The existence of causal linear phase infinite impulse response (IIR) digital filters is investigated. The conditions for their existence are derived, and a set of examples satisfying these conditions is given. It is shown that the sequences must be integer samples of a continuous-time function, bandlimited to (- pi , pi ), which is symmetric and has zero crossings at the negative integers, and the... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optimal design of maximally flat FIR filters with arbitrary magnitude specifications

    Publication Year: 1989, Page(s):512 - 518
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    An optimal design procedure for maximally flat FIR (finite impulse response) filters, based on the Bernstein polynomial, is proposed. Using a set of recurrence relations, this method simultaneously searches for the optimum order of filter and the orders of tangency at w=0 and w= pi , in a staircase-like manner. A detailed comparison to the earlier methods establishes the superiority of this approa... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A quadratic spline function generator

    Publication Year: 1989, Page(s):534 - 544
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (815 KB)

    A function generator is developed which purges digital-to-analog (D-A) conversion of phase distortions by replacing both the hold circuit and the analog low-pass filter. This generator implements interpolation of a discrete-time signal by a quadratic spline function which is a smooth piecewise polynomial. Fidelity in the amplitude characteristic of the generator is estimated. It is also proved tha... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Euclid algorithm and the fast computation of cross-covariance and autocovariance sequences

    Publication Year: 1989, Page(s):545 - 552
    Cited by:  Papers (15)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (635 KB)

    A simple linear procedure is given to compute the cross-covariance sequence associated with the outputs of two rational digital transfer functions driven by the same white noise sequence. Such a computation often appears in the study of digital filters, in Wiener filtering, in noise variance estimation, in the study of low-order approximations, and in the study of multichannel systems. A fast algo... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The LOT: transform coding without blocking effects

    Publication Year: 1989, Page(s):553 - 559
    Cited by:  Papers (225)  |  Patents (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (989 KB)

    An exact derivation of an optimal lapped orthogonal transform (LOT) is presented. The optimal LOT is related to the discrete cosine transform (DCT) in such a way that a fast algorithm for a nearly optimal LOT is derived. Compared to the DCT, the fast LOT requires about 20-30% more computations, mostly additions. An image coding example demonstrates the effectiveness of the LOT in reducing blocking... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A general linear prediction approach to the complex split inversion algorithm

    Publication Year: 1989, Page(s):574 - 577
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (433 KB)

    A general linear prediction framework is developed for the derivation of the complex split Levinson algorithm, which leads naturally to a structural interpretation of the redundancy present in the classical Levinson-Durbin algorithm. A novel order-recursive predictor structure is presented. It is conceptually simpler than a lattice realization since it propagates only one (generalized) prediction ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Adaptive line enhancement by using an IIR lattice notch filter

    Publication Year: 1989, Page(s):585 - 589
    Cited by:  Papers (33)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (522 KB)

    Two simple methods for retrieving a single sinusoid corrupted with noise are proposed. They are based on the lattice form realization of an adaptive infinite-impulse-response (IIR) notch filter. The IIR filter is a cascade of second-order all-pole and all-zero filters, and the coefficients of the finite-impulse-response (FIR) section are adapted. The proposed algorithms keep the poles of the filte... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Restoration of randomly blurred images by the Wiener filter

    Publication Year: 1989, Page(s):589 - 592
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (732 KB)

    The restoration of images distorted by systems with noisy point spread functions and additive detective noise is considered. The criterion considered for the restoration is based on the Wiener technique. The proposed Wiener-based filter is iterative in nature. The overall computation of this modified Wiener filter can be carried out in the frequency domain using the fast Fourier transform and circ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Superresolution reconstruction through object modeling and parameter estimation

    Publication Year: 1989, Page(s):592 - 595
    Cited by:  Papers (13)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (439 KB)

    A method based on object modeling and parameter estimation is proposed to achieve superresolution reconstruction. An efficient method for solving for the model parameters is given that uses linear prediction theory and linear least squares fitting. Reconstruction results from simulated and real magnetic resonance data are also presented to demonstrate its capability for Gibbs ringing reduction and... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The analysis of the continuous-time LMS algorithm

    Publication Year: 1989, Page(s):595 - 597
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    A continuous-time analog adaptive filter is suggested using the digital prototype. The continuous-time LMS (least-mean squares) algorithm is then described by a set of simultaneous first-order equations. The adaptive gain is shown to be unbounded theoretically.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Strong consistency of the LAD (L/sub 1/) estimator of parameters of stationary autoregressive processes with zero mean

    Publication Year: 1989, Page(s):597 - 600
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (421 KB)

    Strong consistency (almost sure convergence to the true parameters) of the LAD (least absolute deviations) AR (autoregressive) parameter estimator has been proven by S. Gross and W.L. Steiger (1979) under the condition that i.i.d. noise driving a stationary autoregressive process has zero median. This work extends their proof to include the case when the driving noise has zero mean. Thus, when the... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Binary filters for pattern classification

    Publication Year: 1989, Page(s):604 - 611
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (619 KB)

    Generalized Fourier correlators imposing finite system space-bandwidth products are described, and a class of binary filters is proposed. In pattern classification and signal registration applications, it is shown that for a particular class of signals, the binary filters yield the same asymptotic performance as the matched filter. It is hence adduced that a dynamic range of a single bit in the fi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A systolic realization for 2-D digital filters

    Publication Year: 1989, Page(s):560 - 565
    Cited by:  Papers (52)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    Systolic hardware realizations for two-dimensional finite-impulse-response (FIR) and infinite-impulse-response (IIR) digital filters are presented. The structure permits the 2-D input data to be scanned row-wise and broadcasted one value at a time to various processing elements. Shift registers are used to store the required data needed by the 2-D recursive equation. A processing element can be im... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Principal components algorithms for ARMA spectrum estimation

    Publication Year: 1989, Page(s):566 - 571
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Principal components algorithms are presented for the problem of fitting an ARMA model to a given segment of a sample sequence of a discrete-time stochastic process, and the model is used to estimate the process power spectrum. To reduce the effects of finite-wordlength errors, balanced state-pace parameterization of the ARMA model is used instead of the more popular difference equation parameteri... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On computation of the running median

    Publication Year: 1989, Page(s):572 - 574
    Cited by:  Papers (24)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    A fast median filtering algorithm with logarithmic time complexity is presented that is based on a special data structure, a double heap, which naturally supports the median. With slight modification, the approach can be used to implement any rank-order filter. A complete implementation of the algorithm has been tested as a global Modula-2 module and has the expected performance and correctness View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • In-situ bit-reversed ordering for Hartley transforms

    Publication Year: 1989, Page(s):577 - 580
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    The Johnson-Burrus method of in situ ordering for FFTs is applied to fast Hartley transforms. It amounts to tying together two consecutive butterfly operations, involving eight real data, swapping some of their results. Pre- and postpermutation can thereby be avoided. The identification of negative indexes, significantly in Hartley transforms, is nontrivial but easily resolved View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Iterative methods for restoring noisy images

    Publication Year: 1989, Page(s):580 - 585
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (900 KB)

    An iterative image restoration algorithm is presented that is based on the best linear mean-square estimate of the Wiener filter technique and the iterative approach of the first-order, stationary, linear Jacobi method. The iterative algorithm incorporates a priori knowledge concerning the image and noise statistics directly into the iterative procedure. It also assumes the image covariance to be ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Generation of a time series having a specified power spectrum with minimum roundoff noise

    Publication Year: 1989, Page(s):496 - 504
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (556 KB)

    The problem of determining a shaping filter which minimized the output roundoff-noise variance is discussed. It is shown that in the family of shaping filters of an identical McMillan degree having an identical power spectrum, the shaping filter of minimum phase attains a minimum output roundoff-noise variance in either the case of optimal word lengths or the case of equal word lengths. It is show... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Systolic preprocessors for linearly constrained beamforming

    Publication Year: 1989, Page(s):600 - 604
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    Systolic preprocessors for linearly constrained beamforming are developed using factorizations of the generalized sidelobe canceller. These preprocessors transform linearly constrained beamformers into unconstrained form, which permits unconstrained adaptive processors to be used for computing the beamformer output. Two preprocessors are developed for small numbers of constraints relative to the d... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Adaptive IIR algorithms based on high-order statistics

    Publication Year: 1989, Page(s):485 - 495
    Cited by:  Papers (43)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    Recursive estimation algorithms are derived for moving-average and autoregressive moving-average processes. These algorithms can be used for adaptive infinite impulse response (IIR) filtering of non-Gaussian processes. The behavior of these algorithms is illustrated by extensive numerical examples View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Adaptive IIR filtering using parallel-form realizations

    Publication Year: 1989, Page(s):519 - 533
    Cited by:  Papers (45)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1092 KB)

    Several parallel-form adaptive IIR (infinite impulse response) filters are presented, including a frequency-domain implementation based on the discrete Fourier transform and a recursive frequency-sampling structure. The performance of the frequency-domain adaptive IIR filter is investigated in a system identification application, which includes an analysis of its modeling capabilities and a discus... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Eigenfilter design of higher-order digital differentiators

    Publication Year: 1989, Page(s):505 - 511
    Cited by:  Papers (46)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    An effective approach is proposed for designing higher order differentiators by the eigenfilter method. By minimizing a quadratic measure of the error in the frequency band, an eigenvector of an appropriate matrix is computed to get the filter coefficients. This method is not only simple and fast, but also optimal in the least-squares sense. Comparison to the McClellan-Parks algorithm for minimax ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

This Transactions ceased production in 1990. The current retitled publication is IEEE Transactions on Signal Processing.

Full Aims & Scope