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IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 9 • Date Sep 1988

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Displaying Results 1 - 25 of 26
  • Systolic implementation on Kalman filters

    Publication Year: 1988, Page(s):1514 - 1517
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    Two schemes for implementing systolic and pipelined processing on Kalman filters in real time are presented. In the first, a single two-dimensional systolic processor is used to perform a Kalman filtering process. In the second scheme, the utilization of the two-dimensional systolic processor is fully expanded and improves the speed of updating estimates, Kalman filter algorithms are implemented o... View full abstract»

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  • A new method for estimation of coronary artery dimensions in angiograms

    Publication Year: 1988, Page(s):1501 - 1513
    Cited by:  Papers (61)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1176 KB)

    A novel approach is presented for the measurement of the severity of coronary obstructions from coronary angiograms. The proposed approach exploits the characteristics of the signals involved. A model of the film density of the densitometric profiles of lines crossing the vessel is developed and used to estimate the diameter and cross-sectional area at each point along the vessel. The model accoun... View full abstract»

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  • Interference-tolerant time-difference-of-arrival estimation for modulated signals

    Publication Year: 1988, Page(s):1385 - 1395
    Cited by:  Papers (19)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    A method for estimation of the difference in the times of arrival of wavefronts of two separate sensors is introduced. The method, called SPECCORR, exploits the spectral correlation property, called spectral coherence, that essentially all modulated signals exhibit to obtain estimates that are highly tolerant to severely corruptive noise and interference. This tolerance is explained theoretically ... View full abstract»

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  • A new orthogonal transform for signal coding

    Publication Year: 1988, Page(s):1404 - 1411
    Cited by:  Papers (13)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    The authors propose an orthogonal, unitary transformation called the modified Hermite transformation (MHT) and its extension, which is called the modular modified Hermite transformation (MMHT). The MHT algorithm, which is an efficient algorithm, is explained and explored. The MHT is compared to the discrete cosine transform (DCT) for various AR(1) input signal source models using the performance c... View full abstract»

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  • Design and performance of trellis vector quantizers for speech signals

    Publication Year: 1988, Page(s):1423 - 1431
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (756 KB)

    Design algorithms are presented for linear predictive vector quantizers with trellis structures that, when combined with appropriate search procedures, can achieve lower distortions than conventional memoryless vector quantizers. Two types of trellis structures, shift register and minimum degradation network, are considered. In the shift register case (SR-TVQ), the state of the trellis encoder cor... View full abstract»

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  • A new approach to recursive mirror filters with a special application in subband coding of images

    Publication Year: 1988, Page(s):1496 - 1500
    Cited by:  Papers (10)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    A novel method for applying recursive mirror filters (RMF) in applications where infinite delay can be tolerated is presented. This type of situation can be found in several circumstances, but the method has its main applications in a technique of subband coding of images which was presented by J.W. Woods and S.D. O'Neill (ibid., vol.ASSP-34, p.1278-88, Oct. 1986). In image coding, a delay is only... View full abstract»

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  • Tracking characteristics of the constrained IIR adaptive notch filter

    Publication Year: 1988, Page(s):1466 - 1479
    Cited by:  Papers (53)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    The tracking behavior of a constrained IIR notch filter, the coefficients of which are estimated using a constant-step-size Gauss-Newton algorithm, is studied. Using weak convergence theory and the concept of prescaling, it is shown that the mean behavior of the adaptive filter coefficients can be studied by using an ordinary differential equation (ODE). Approximate and simple closed-form results ... View full abstract»

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  • A time-frequency formulation of optimum detection

    Publication Year: 1988, Page(s):1377 - 1384
    Cited by:  Papers (105)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB)

    A time-frequency formulation is proposed for the optimum detection of Gaussian signals in white Gaussian noise. By choosing the Wigner-Ville distribution as the basic time-frequency tool, it is shown that the corresponding receivers generally take the form of a correlation between time-frequency structures, matching mathematical optimality with a physically meaningful interpretation. The case of l... View full abstract»

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  • Efficient bit allocation for an arbitrary set of quantizers [speech coding]

    Publication Year: 1988, Page(s):1445 - 1453
    Cited by:  Papers (619)  |  Patents (45)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    A bit allocation algorithm that is capable of efficiently allocating a given quota of bits to an arbitrary set of different quantizers is proposed. This algorithm is useful in any coding scheme which uses bit allocation or, more generally, codebook allocation. It produces an optimal or very nearly optimal allocation, while allowing the set of admissible bit allocation values to be constrained to n... View full abstract»

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  • Linear prediction on a warped frequency scale [speech processing]

    Publication Year: 1988, Page(s):1529 - 1531
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    An ordinary predictor and a frequency warped predictor are compared in an ADPCM (adaptive differential pulse code modulation) system. The experimental results show that for an unwarped predictor of order ten, the order of the warped predictor can be reduced by two for the same speech quality. The audible differences between the normal and the warped predictors are very small, so the statements of ... View full abstract»

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  • An FPT algorithm with a modularized structure for computing 2-D cyclic convolutions

    Publication Year: 1988, Page(s):1540 - 1542
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    The fast polynomial transform (FPT) for computing 2-D cyclic convolutions is modularized into identical modules. In the new method, the 1-D cyclic polynomial convolution is decomposed into cycle convolutions of polynomials, all of the same length. Thus, only FPTs and FFT's of the same length are required. As a consequence, the architecture is more regular and naturally suitable for a VLSI implemen... View full abstract»

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  • Note on the use of the Wigner distribution for time-frequency signal analysis

    Publication Year: 1988, Page(s):1518 - 1521
    Cited by:  Papers (45)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    It is shown that a correct use of the Wigner distribution (WD) for time-frequency signal analysis requires use of the analytic signal. This version, often referred to as the Wigner-Ville distribution (WVD), is straightforward to compute, does not exhibit any aliasing problem, and introduces no frequency artifacts. The problems introduced by the use of the Wigner distribution with a real signal are... View full abstract»

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  • On the use of autoregressive order determination criteria in multivariate white noise tests

    Publication Year: 1988, Page(s):1396 - 1403
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    Testing the hypothesis of multivariate white noise is seen as the selection of the order of a multivariate autoregressive model for the observed time series. Therefore, multivariate white noise tests can be carried out by applying autoregressive order-determination criteria such as AIC, BIC, etc. It is known, for example, that the BIC criterion estimates consistently the order of an autoregression... View full abstract»

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  • A digit pipelined dynamic time warp processor [word recognition]

    Publication Year: 1988, Page(s):1412 - 1422
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (972 KB)

    A custom CMOS systolic design is presented which can achieve real-time isolated word recognition for large dictionaries. The design is based on the dynamic time warping (DTW) algorithm, an exhaustive search technique which permits nonlinear pattern matching between an unknown utterance and a reference word. This design differs from previous systolic DTW designs in that all data is represented in s... View full abstract»

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  • On a model-robust training method for speech recognition

    Publication Year: 1988, Page(s):1432 - 1436
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    Training methods for designing better decoders are compared. The training problem is considered as a statistical parameter estimation problem. In particular, the conditional maximum likelihood estimate (CMLE), which estimates the parameter values that maximize the conditional probability of words given acoustics during training, is compared to the maximum-likelihood estimate, which is obtained by ... View full abstract»

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  • Classical sampling theorems in the context of multirate and polyphase digital filter bank structures

    Publication Year: 1988, Page(s):1480 - 1495
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1204 KB)

    The recovery of a signal from so-called generalized samples is a problem of designing appropriate linear filters called reconstruction (or synthesis) filters. This relationship is reviewed and explored. Novel theorems for the subsampling of sequences are derived by direct use of the digital-filter-bank framework. These results are related to the theory of perfect reconstruction in maximally decima... View full abstract»

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  • Efficient structurally symmetric algorithms for least squares FIR filters with linear phase

    Publication Year: 1988, Page(s):1454 - 1465
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (684 KB)

    Two novel least-squares algorithms are derived for the computation of the FIR coefficients of multichannel filters with linear (affine) phase. One is for block processing and requires 2 Np+4.25 p 2 additions and 2 Np+3p2 multiplications, with N being the number of input data samples and p the order of the filter. The secon... View full abstract»

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  • Recursive construction of polynomial with prescribed phase on unit circle

    Publication Year: 1988, Page(s):1531 - 1533
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    A recursive technique for constructing a polynomial with prescribed phase characteristics on a unit circle is described. An example is given to illustrate the procedure View full abstract»

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  • Tree encoding of line drawings

    Publication Year: 1988, Page(s):1542 - 1549
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    Recently, tree-searched chain codes have been proposed that reduce the reconstruction distortion significantly compared to chain codes. The authors study tree coding schemes to encode line drawings and show that they outperform the basic and tree-searched chain codes. Both adaptive and nonadaptive tree coding schemes are studied. The adaptive schemes considered include an adaptive gradient algorit... View full abstract»

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  • The use of modulated splines for the reconstruction of band-limited signals

    Publication Year: 1988, Page(s):1521 - 1525
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    A class of kernels of short duration is developed for interpolating band-limited signals. The class consists of modulated splines, and utilizes the rapid attenuation of their Fourier transform. The design is based on a minimax mean-square error criterion View full abstract»

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  • LPC speech coding based on variable-length segment quantization

    Publication Year: 1988, Page(s):1437 - 1444
    Cited by:  Papers (50)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    A low-bit-rate linear predictive coder (LPC) that is based on variable-length segment quantization is presented. In this vocoder, the speech spectral-parameter sequence is represented as the concatenation of variable-length spectral segments generated by linearly time-warping fixed-length code segments. Both the sequence of code segments and the segment lengths are efficiently determined using a d... View full abstract»

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  • Application of the Weiss-Weinstein bound to a two-dimensional antenna array

    Publication Year: 1988, Page(s):1533 - 1534
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    The Weiss-Weinstein (WW) bound is applied to an 8×8 element uniform antenna array, for a single source impinging on the array. The WW bound for this problem is evaluated and compared to simulations of the MUSIC algorithm and classical beamforming. The simulations show that for high signal-to-noise ratio (SNR), the WW bound is met by both algorithms; however, the threshold for MUSIC and class... View full abstract»

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  • Image reconstruction by bivariate quadratic splines

    Publication Year: 1988, Page(s):1525 - 1529
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    An approximation method for reconstructing the smooth image from a set of pixel data is described. The approximation space used is the space of bivariate piecewise polynomials of total degree two on the crisscross triangulation that have continuous first partial derivatives everywhere. This space is known to have a basis consisting of minimally supported functions, called B-splines for convenience... View full abstract»

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  • Recursive generation of the DIF-FFT algorithm for 1-D DFT

    Publication Year: 1988, Page(s):1534 - 1536
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    It is shown by using the Walsh-Hadamard matrix and a conversion matrix, a DIF-FFT algorithm can be developed for the radix-2 discrete Fourier transform (DFT). The recursive generation of the DFT matrix leads to its sparse matrix factorization. The flowgraph based on these sparse matrices is identical to that of the DFT-FFT algorithm View full abstract»

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  • Corrections to `Harmonic retrieval of analog signals'

    Publication Year: 1988
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (88 KB)

    In the above mentioned paper (ibid., vol.36, p.134-6, Jan. 1988) the author represented the signal μ(t) in baseband form, and he now argues that this is an error since it results in unbounded power estimates pi. It is necessary to treat μ(t ) directly as a bandpass signal. This changes the support of ω in eq. (1) and the region of integration in eq... View full abstract»

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Aims & Scope

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

Full Aims & Scope