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IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 1 • Date February 1985

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Displaying Results 1 - 25 of 52
  • [Front cover and table of contents]

    Publication Year: 1985, Page(s): 0
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    Freely Available from IEEE
  • VLSI Silicon compilation and the art of automatic microchip design [Book Reviews]

    Publication Year: 1985, Page(s):336 - 337
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    Freely Available from IEEE
  • Adaptive filtering prediction and control [Book Reviews]

    Publication Year: 1985, Page(s):337 - 338
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    Freely Available from IEEE
  • LC filter design, test, and manufacturing

    Publication Year: 1985, Page(s): 337
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (161 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1985, Page(s): c4
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    Freely Available from IEEE
  • Color display system for connected speech to be used for the hearing impaired

    Publication Year: 1985, Page(s):164 - 173
    Cited by:  Papers (7)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1256 KB)

    A color display system for the hearing impaired which converts connected speech signals into color pictures on a TV screen has been developed. This paper describes the principle, the function and the performance of the system, and the visual images of the patterns displayed using the system. The system consists of a real-time formant tracker, a pitch detector, a memory system, a color coder, etc. ... View full abstract»

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  • Signal restoration from data aliased in time

    Publication Year: 1985, Page(s):151 - 159
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    This paper deals with the problem of signal restoration from data aliased in time. The signal, which is in general noncausal, is split into a causal and an anticausal part. The causal part and the time-reversed anticausal part are then modeled as impulse responses of rational pole-zero models. The parameters of these models are then estimated by solving sets of overdetermined equations. The choice... View full abstract»

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  • Kaiser-Bessel weighting of the Hilbert transform high-cut filter

    Publication Year: 1985, Page(s):329 - 331
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    This correspondence presents two empirical equations that assist in the accurate design of Hilbert transform high-cut filters. These equations allow the formulation of time-variant filters that meet a priori specifications for attenuation and rolloff interval. View full abstract»

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  • Fitting autoregressive models to EEG time series: An empirical comparison of estimates of the order

    Publication Year: 1985, Page(s):143 - 150
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (920 KB)

    A parametrization of the spectral structure of time series data is of great interest in many fields of science such as eleetroencephalography (EEG). Autoregressive processes offer such a representation. The problem is to find a parsimonious representation which fits the data well. Three criteria for determining the order of autoregressive models are, therefore, compared. A simulation is done for s... View full abstract»

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  • Optimal solution of a training problem in speech recognition

    Publication Year: 1985, Page(s):326 - 329
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    We take the view that the payoff correpsonding to different ways of training a speech recognizer is the probability that the recognizer will correctly recognize a randomly chosen word. In "A Decision Theoretic Formulation of a Training Problem in Speech Recognition" we posed the problem of choosing a speech recognizer as an optimization problem with the expected value of the above payoff as the ob... View full abstract»

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  • Texture synthesis using 2-D noncausal autoregressive models

    Publication Year: 1985, Page(s):194 - 203
    Cited by:  Papers (81)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1024 KB)

    The purpose of this paper is to illustrate the usefulness of two dimensional noncausal autoregressive (NCAR) models for the synthesis of textures. These models characterize the gray level at a pixel as a linear combination of gray levels at nearby locations in all directions and an additive white noise variable. We first show that the class of NCAR models is capable of generating a wide variety of... View full abstract»

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  • Time correlation statistics of the LMS adaptive algorithm weights

    Publication Year: 1985, Page(s):309 - 312
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    The transient and steady-state weight correlation statistics of both the real and complex LMS adaptive filters are obtained when the inputs are independent samples from real and circularly Gaussian processes, respectively. A matrix relationship is derived between the covariance matrix of the weight vector at two different times and the covariance matrix of the weights at one time. These expression... View full abstract»

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  • A fast maximum likelihood algorithm for frequency estimation of a sinusoid based on Newton's method

    Publication Year: 1985, Page(s):77 - 89
    Cited by:  Papers (71)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    A fast algorithm to estimate the frequency of a sinusoid is presented here. It is based on Newton's method for finding the root of an equation, and it is shown that under easily met conditions, the root mean-square error (RMSE) of the estimator is practically equal to the Cramer-Rao bound after only two iterations of Newton's method for all signal-to-noise ratios (SNR's) above threshold. The estim... View full abstract»

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  • Convergence analysis of LMS filters with uncorrelated Gaussian data

    Publication Year: 1985, Page(s):222 - 230
    Cited by:  Papers (236)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    Statistical analysis of the least mean-squares (LMS) adaptive algorithm with uncorrelated Gaussian data is presented. Exact analytical expressions for the steady-state mean-square error (mse) and the performance degradation due to weight vector misadjustment are derived. Necessary and sufficient conditions for the convergence of the algorithm to the optimal (Wiener) solution within a finite varian... View full abstract»

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  • One-dimensional processing for adaptive image restoration

    Publication Year: 1985, Page(s):117 - 126
    Cited by:  Papers (34)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1824 KB)

    A one-dimensional (1-D) approach to the problem of adaptive image restoration is presented. In this approach, we use a cascade of four 1-D adaptive filters oriented in the four major correlation directions of the image, with each filter treating the image as a 1-D signal. The objective of developing restoration techniques using this approach is to improve the performance of two-dimensional (2-D) t... View full abstract»

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  • Root properties and convergence rates of median filters

    Publication Year: 1985, Page(s):230 - 240
    Cited by:  Papers (70)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1120 KB)

    Median filters are a special class of ranked order filters used for smoothing signals. Repeated application of the filter on a quantized signal of finite length ultimately results in a sequence, termed a root signal, which is invariant to additional passes of the median filter. In this paper, the theory is developed both for determining the cardinality of the root signal space of arbitrary window ... View full abstract»

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  • Analysis of the short-time unbiased spectrum estimation algorithm.

    Publication Year: 1985, Page(s):136 - 142
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    The short-time unbiased spectrum estimation (STUSE) algorithm is analyzed and expressions for the mean and variance of the spectrum estimates are derived. The STUSE algorithm deliberately adds biased spectrum estimates in order to yield unbiased estimates and at the same time have excellent spectral leakage suppression capabilities. Computer simulations are presented, verifying the theoretical res... View full abstract»

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  • A method for cancelling interference from a constant envelope signal

    Publication Year: 1985, Page(s):316 - 319
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    A method for adaptively cancelling interference from a constant envelope target signal is presented. The method is useful, even when some of the interfering signals are also constant envelope. The adaptive algorithm distinguishes between target signal and interference on the basis of signal amplitude and envelope shape. The amplitude of the target signal must be approximately known or measurable. View full abstract»

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  • Discrete-time distortion analysis of quantized sinusoids

    Publication Year: 1985, Page(s):323 - 326
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    Results are presented for the harmonic distortion and intermodulation products associated with file quantization of two sinusoids, with and without noise present. For the case of one sinusoid strong and the other weak, it is demonstrated that the intermodulation distortion is not as large as the self-distortion of the quantized strong sinusoid alone. View full abstract»

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  • Positive time-frequency distribution functions

    Publication Year: 1985, Page(s):31 - 38
    Cited by:  Papers (77)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    We demonstrate the existence of positive joint distributions of time and frequency for arbitrary signals. A method is given to readily generate an infinite number of them for any signal. General properties of these distribution functions are derived and specific examples for some common signals are presented. View full abstract»

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  • Time-delay estimation performance in a scattering medium

    Publication Year: 1985, Page(s):50 - 60
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    The effects of a scattering medium on the performance of time-delay estimation are considered. The medium is assumed to exhibit angular scattering, causing angular (as well as delay) dispersion and hence loss of signal coherence across the array aperture. Both the variance (via the Cramer-Rao bound) and the bias introduced in the time-delay estimates are studied. The results have been converted to... View full abstract»

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  • LSI implementation of a pattern matching algorithm for speech recognition

    Publication Year: 1985, Page(s):1 - 4
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    Many speech recognition systems contain the foUowing functional blocks: a voice input circuit, a feature extractor (analyzer), a unit for calculating the distance between input and standard patterns at every frame, a memory for storing standard patterns, a unit for matching whole word patterns (a pattern matching circuit), and a final decision and system control circuit. The pattern matching circu... View full abstract»

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  • On relating discrete Fourier, sine, and symmetric cosine transforms

    Publication Year: 1985, Page(s):219 - 222
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    The relationship among a real formalism of the discrete Fourier transform, discrete sine transform, and discrete symmetric cosine transform is discussed. It is shown that the real formalism of the discrete Fourier transform is basically equivalent to the direct sum of the other two transforms, with modifications in the pre- and post-computations with the data vector. View full abstract»

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  • Ordered and partially ordered processing of multidimensional images

    Publication Year: 1985, Page(s):185 - 194
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    Multidimensional images are often converted by scanning to a raster format. For real-time processing a causal property relative to the scan order is important. In other examples the multidimensional image is processed without scanning. In such cases a partially ordered causality property is of interest. The present paper gives a definitive study of the interrelationship between the several causali... View full abstract»

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  • The least squares estimation of time delay between two signals with unknown relative phase shift

    Publication Year: 1985, Page(s):308 - 309
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    This correspondence addresses the problem of time delay estimation between two signals with an unknown constant relative phase shift. The method of time delay estimation for the pure delay case of Chan et al. [1] is applied here to derive the least squares estimator (LSE). An explicit expression for the LSE of the delay is obtained which is computationally less complex than the maximum likelihood ... 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