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Acoustics, Speech and Signal Processing, IEEE Transactions on

Issue 6 • Date December 1980

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Displaying Results 1 - 25 of 30
  • [Front cover and table of contents]

    Publication Year: 1980, Page(s): 0
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    Freely Available from IEEE
  • Corrections to "Evaluation of quantization error in two-dimensional digital filters"

    Publication Year: 1980, Page(s):768 - 769
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1980, Page(s): c4
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    Freely Available from IEEE
  • On some suboptimum ARMA spectral estimators

    Publication Year: 1980, Page(s):753 - 755
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    This correspondence describes some suboptimum schemes for ARMA spectral estimation. A least squares method is presented and compared to the method based on the modified Yule-Walker equations. A modification of the latter method is also given that improves its behavior in estimating spectra with narrow peaks. Examples are then shown that compare the suboptimum methods to the maximum likelihood one. View full abstract»

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  • Optimal estimation of time series functions

    Publication Year: 1980, Page(s):763 - 767
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    The principal methods of spectral estimation include kernel smoothing, ME-AR methods, and the Prony algorithm. In this paper we consider not only the estimation of spectral density matrices, but also related time series functions such as transfer functions, gain, phase, cepstrum, and so on. Computational algorithms are developed for use of splines as estimators. Smoothing splines are shown to be s... View full abstract»

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  • Performance tradeoffs in dynamic time warping algorithms for isolated word recognition

    Publication Year: 1980, Page(s):623 - 635
    Cited by:  Papers (119)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1248 KB)

    The technique of dynamic programming for the time registration of a reference and a test pattern has found widespread use in the area of isolated word recognition. Recently, a number of variations on the basic time warping algorithm have been proposed by Sakoe and Chiba, and Rabiner, Rosenberg, and Levinson. These algorithms all assume that the test input is the time pattern of a feature vector fr... View full abstract»

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  • The cause of line splitting in Burg maximum-entropy spectral analysis

    Publication Year: 1980, Page(s):692 - 701
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1144 KB)

    Burg's algorithm for maximum-entropy autoregressive spectral estimation is analyzed for the case of one and two complex sinusoidal signals in additive white noise. In the latter case, two biases are found which can account for the line splitting and line shifting that occur in simulation studies when the SNR is very high. These biases vanish completely if the two complex sinusoids are in phase qua... View full abstract»

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  • Suppression of acoustic noise in speech using two microphone adaptive noise cancellation

    Publication Year: 1980, Page(s):752 - 753
    Cited by:  Papers (47)  |  Patents (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Acoustic noise with energy greater or equal to the speech can be suppressed by adaptively filtering a separately recorded correlated version of the noise signal and subtracting it from the speech waveform. It is shown that for this application of adaptive noise cancellation, large filter lengths are required to account for a highly reverberant recording environment and that there is a direct relat... View full abstract»

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  • A simple proof of Rudin's multivariable stability theorem

    Publication Year: 1980, Page(s):701 - 705
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    It is shown how Rudin's multivariable stability theorem can be proved by using simple one-variable arguments, exclusively. In particular, no use is made of multivariable homotopy, in contrast with the original proof. The efficacy of the approach presented here is further illustrated by deriving a new stability test as well as elementary and independent proofs for the classical criteria. View full abstract»

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  • An iterative implementation for 2-D digital filters

    Publication Year: 1980, Page(s):666 - 671
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    A 2-D digital filter with a rational frequency response can be expanded into an infinite sequence of filtering operations. Each filtering operation can be implemented by convolution with a low-order 2-D finite-extent impulse response. This sequence of filtering operations can be viewed as an iteration where a new estimate of the output signal is formed from the previous estimate. If a convergence ... View full abstract»

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  • The recursive adaptive LMS filter--A line enhancer application and analytical model for the mean weight behavior

    Publication Year: 1980, Page(s):652 - 660
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    A mathematical model is presented for the recursive adaptive filter (RAF) configured as an adaptive line enhancer (ALE) in the frequency domain. The inputs for the model are Markovian and the number of recursive taps is selected to equal the order of the Markov process. Thus, the RAF structure is sufficient to realize the Wiener filter. Assuming that the expectations of all filter-data interaction... View full abstract»

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  • A new approach to the determination of the glottal waveform

    Publication Year: 1980, Page(s):616 - 622
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    A new two-step procedure is proposed for the determination of the glottal waveform. In the first step, the inverse filter An(z), having zeros which correspond to the formant poles, is determined by applying the covariance method on the preemphasized speech signal ... View full abstract»

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  • Error analysis of recursive digital filters implemented with logarithmic number systems

    Publication Year: 1980, Page(s):706 - 715
    Cited by:  Papers (36)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (944 KB)

    This paper presents an analysis of roundoff error accumulation in the direct realization of a logarithmic-arithmetic digital filter and formulas for computing the ratio of the rms value of the roundoff error and that of the output signal of the digital filter. It is shown that for the case of stochastic input, the theoretical error to signal ratio is less using logarithmic number systems as compar... View full abstract»

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  • An algorithm for computing the Nth roots of unity in bit-reversed order

    Publication Year: 1980, Page(s):762 - 763
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    Many versions of the fast Fourier transform require that the user provide a table of the Nth roots of unity arranged in bit-reversed order. An algorithm for creating this table is given in this paper. The algorithm uses approximately N complex multiplications for a time series of length N. The algorithm's main advantage is its insensitivity to computational errors. The cumulative roundoff error is... View full abstract»

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  • The Burg algorithm for LPC speech analysis/Synthesis

    Publication Year: 1980, Page(s):609 - 615
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    The performance of the Burg method for speech analysis is compared to the autocorrelation and covariance methods. The criterion of goodness is the accuracy of the spectral approximation, filter stability, windowing requirements, data frame length, and spectral resolution. A mathematical comparison is presented for the simple first-order signal. Spectral comparisons are presented for a second-order... View full abstract»

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  • Use of transversal-recursive structures for efficient realization of low-noise digital filters with decimated output

    Publication Year: 1980, Page(s):645 - 651
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    For fixed-point realizations of narrow-band digital filters, the normal form is significantly less sensitive to roundoff error than either parallel or cascade direct forms. However, the normal form requires more multipliers. This disadvantage can be overcome in filters with decimated output by the use of nonminimal transversal-recursive structures derived from the normal form. These structures can... View full abstract»

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  • Multivariate polynomial positivity invariance under coefficient perturbation

    Publication Year: 1980, Page(s):660 - 665
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    Results on the determination of the interval within which the coefficients of a globally positive multivariate polynomial might fluctuate without altering the positivity property are given. The topic is of direct interest to various physical problems including multidimensional filter stability, sensitivity of network properties to variation in component values, and general error analysis of discre... View full abstract»

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  • Learning characteristics of adaptive lattice filtering algorithms

    Publication Year: 1980, Page(s):681 - 691
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1216 KB)

    This paper describes the performance and learning characteristics of the continuously adaptive lattice form for prediction-error filtering. Quantitative relationships are developed for convergence behavior, and procedures are described for selection of the adaptive weighting constant and filter order. Burg's algorithm is used to calculate the reflection coefficients of the filter. Based on this al... View full abstract»

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  • Improvement of acoustic-feedback stability by bandwidth compression

    Publication Year: 1980, Page(s):636 - 644
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    Shifting the input signal's frequencies by a fixed frequency Δf has been proven to be effective in improving the stability margin of public address systems operating in reverberant spaces. This paper describes the effect of an alternative approach of improving the acoustic feedback stability by compressing the bandwidth of the speech signal and yet maintaining full speech intelligibility. Thi... View full abstract»

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  • High performance loudspeakers

    Publication Year: 1980, Page(s): 769
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  • Signal reconstruction from phase or magnitude

    Publication Year: 1980, Page(s):672 - 680
    Cited by:  Papers (161)  |  Patents (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1168 KB)

    In this paper, we develop a set of conditions under which a sequence is uniquely specified by the phase or samples of the phase of its Fourier transform, and a similar set of conditions under which a sequence is uniquely specified by the magnitude of its Fourier transform. These conditions are distinctly different from the minimum or maximum phase conditions, and are applicable to both one-dimensi... View full abstract»

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  • On a conjecture for the design of low-pass recursive filters

    Publication Year: 1980, Page(s): 768
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    Recently, Shenoi and Agrawal [1] discussed the design of low-pass recursive filters using a modified Darlington scheme. A conjecture was made regarding the form of the numerator in the magnitude-squared function. This conjecture was based on two identities satisfied by Chebyshev polynomials. This correspondence provides the proofs for these identities. View full abstract»

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  • A continuous recursive DFT analyzer--The discrete coherent memory filter

    Publication Year: 1980, Page(s):760 - 762
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The discrete version of the coherent memory filter (DCMF) is introduced and it is shown that the device performs a (N point) DFT of the N input data samples. It is also shown that with a simple modification the device can be operated recursively, so that as the data samples flow in, the DFT of the last N data samples are performed continuously. View full abstract»

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  • Confidence bounds for signal-to-noise ratios from magnitude-squared coherence estimates

    Publication Year: 1980, Page(s):758 - 760
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    Coherence is used frequently to determine the degree to which one observed voltage is related to another observed voltage. Typically, in practice, these observables are degraded by system noise that is often independent, white, and Gaussian. Often, in measuring coherence, the interest is to determine the fraction of the observed power that is due to coherent signals and the fraction that is due to... View full abstract»

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  • Analysis and compensation of CTI effects on CCD transversal filter response

    Publication Year: 1980, Page(s):756 - 758
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    Using an approximation generally satisfied in practical applications, an expression for the deviation of the CCD transversal filter transfer function due to the device CTI is obtained. Then a very simple algorithm for the coefficient modification is derived to compensate for the CTI effects, which are thus reduced by more than an order of magnitude. Computer simulations finally show the validity o... 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