# IEEE Transactions on Acoustics, Speech, and Signal Processing

## Filter Results

Displaying Results 1 - 16 of 16
• ### Use of ARMA predictors in the differential encoding of images

Publication Year: 1988, Page(s):1791 - 1795
Cited by:  Papers (12)  |  Patents (1)
| |PDF (560 KB)

Differential pulse code modulation (DPCM) has long been a popular method of data compression for speech. It has not been as popular for images, partly because of its poor edge performance. This is true even for adaptive DPCM (ADPCM). A paper by J.D. Gibson (IEEE Trans. Acoust., Speech, Signal Processing, vol.ASSP-33, p.1166 (1985)) provides a clue to the reason for this shortcoming. His analysis i... View full abstract»

• ### Recognition and velocity computation of large moving objects in images

Publication Year: 1988, Page(s):1790 - 1791
Cited by:  Papers (24)
| |PDF (208 KB)

Two one-dimensional time sequences are generated from the projections of the two-dimensional sequence on the x and y axes. Then the two-dimensional fast Fourier transform for the generated time sequences is computed. A peak in the spectrum for the selected spatial frequency is detected. The temporal frequency at which the peak is detected gives an estimate of the velocity of the... View full abstract»

• ### Exact computation of the unwrapped phase of finite-length time series

Publication Year: 1988, Page(s):1787 - 1790
Cited by:  Papers (6)  |  Patents (1)
| |PDF (360 KB)

R. McGowan and R. Kuc recently (IEEE Trans. Acoust., Speech, Signal Processing, vol.ASSP-30, p.719 (1982)) showed that a direct relationship between a time series and its unwrapped phase exists. They proposed an algorithm for computing the unwrapped phase by counting the number of sign changes in a Sturm sequence generated from the real and imaginary parts of the discrete Fourier transform. Their ... View full abstract»

• ### On Walsh-domain versus RDFT filtering

Publication Year: 1988, Page(s):1786 - 1787
| |PDF (180 KB)

Spectral filtering and the computation of Fourier coefficients by the fast Walsh transform (FWT) and the fast algorithm for the real discrete Fourier transform (FRFT) are discussed on a comparative basis. In all cases discussed, the FRFT has fewer multiplications and additions. As the comparisons show, there is no good reason for using the Walsh-Fourier method in spectral filtering or for the gene... View full abstract»

• ### Reconstruction of a positive definite Toeplitz matrix from its sequence of minimum eigenvalues

Publication Year: 1988, Page(s):1784 - 1786
| |PDF (280 KB)

It is shown that a positive definite symmetric Toeplitz matrix of rank p+1 can be represented uniquely by the minimum eigenvalues of itself and its p submatrices, along with a sign bit for each eigenvalue. The application of such a procedure allows specification of linear prediction coding (LPC) spectra by an alternate set of parameters. It also enables extension of an autocorrel... View full abstract»

• ### A notch filter employing coefficients of equal magnitude

Publication Year: 1988, Page(s):1783 - 1784
| |PDF (168 KB)

A nearly ideal notch filter with coefficients of equal magnitude is described. Applications to the design of transmitting antenna arrays are discussed briefly. The construction is based on earlier work of the author involving polynomials with restricted coefficients View full abstract»

• ### On the sensitivity of transversal RLS algorithms to random perturbations in the filter coefficients

Publication Year: 1988, Page(s):1781 - 1783
Cited by:  Papers (7)
| |PDF (208 KB)

The author investigates the sensitivity of the RLS algorithm to random perturbations about the optimum filter coefficients. Expressions are derived for the mean and variance of the deviation from the optimum error power for the prewindowed growing memory and the experimentally windowed (λ<1) RLS algorithm. The results show that the variance of the deviation for correlated signals increas... View full abstract»

• ### Time delay estimation in unknown Gaussian spatially correlated noise

Publication Year: 1988, Page(s):1706 - 1714
Cited by:  Papers (117)  |  Patents (2)
| |PDF (648 KB)

A novel class of methods that estimate the difference in arrival time between signals corrupted by spatially correlated Gaussian noise sources of unknown cross correlation is presented. The methods are based on the idea of comparing the similarities between the two sensor measurements in higher-order spectrum domains (bispectrum) rather than in the cross-correlation domain. It is demonstrated that... View full abstract»

• ### Stability analysis of multidimensional (m-D) direct realization digital filters under the influence of nonlinearities

Publication Year: 1988, Page(s):1770 - 1780
Cited by:  Papers (35)
| |PDF (640 KB)

A stability test of m-D direct realization digital filters with nonlinearities such as quantization, overflow, saturation, etc., is presented. The method presented reduces a given nonlinear m -D system to a nonlinear 1-D system such that the stability of the latter is sufficient for the stability of the former. To check stability of the nonlinear 1-D system, some new results on 1... View full abstract»

• ### Noise cancellation for hearing aids

Publication Year: 1988, Page(s):1697 - 1705
Cited by:  Papers (10)  |  Patents (2)
| |PDF (864 KB)

The usefulness of hearing aids is severely limited by the existence of the cocktail party effect'. This is due to the very high sensitivity of hearing aid wearers to interfering sounds. A description is given of the result of some work aimed at alleviating this problem. The approach involved the use of an adaptive array of microphones to cancel out the interference. An evaluation is presented of ... View full abstract»

• ### Design of cascade form FIR filters with discrete valued coefficients

Publication Year: 1988, Page(s):1735 - 1739
Cited by:  Papers (82)  |  Patents (1)
| |PDF (360 KB)

The authors show that by cascading two direct-form FIR filters, each with coefficients that are the sum or difference of two power-of-two terms, it is possible to achieve very small peak ripple. An iterative equalization strategy is used in the design of the cascaded filter. The success of the method depends on the initial prototype filter being used. Two equally effective methods are presented fo... View full abstract»

• ### A digital method of modeling quadratically nonlinear systems with a general random input

Publication Year: 1988, Page(s):1758 - 1769
Cited by:  Papers (165)  |  Patents (3)
| |PDF (840 KB)

Without assuming particular statistics of the input, a practical digital method of estimating linear and quadratic transfer functions of a nonlinear time-invariant system that can be described by Volterra series of up to second order is presented. The method is tested and validated by analyzing input-output data of a known quadratically nonlinear system. It is used when there is little knowledge a... View full abstract»

• ### Parallelism in all-pole lattice filters

Publication Year: 1988, Page(s):1795 - 1797
| |PDF (212 KB)

A short overview is given some differential parallelization schemes for all-pole lattice filters. A novel scheme, namely retaining the properties of the original lattice, is put forward, and its materials are discussed. The equivalent structure of the filter is made up of a number of double stages' that require one processing element each View full abstract»

• ### Adaptive deconvolution of seismic signals-performance, computational analysis, parallelism

Publication Year: 1988, Page(s):1715 - 1734
Cited by:  Papers (35)
| |PDF (1156 KB)

The deconvolution problem in the face of incomplete model knowledge is addressed. The proposed solution involves the use of the Lainiotis adaptive estimation algorithm in conjunction with two classes of conventional deconvolution algorithms. The overall performance is investigated through extensive simulation. The computational requirements of the adaptive algorithms are studied in detail. Results... View full abstract»

• ### Fast algorithms for computing QR and Cholesky factors of Toeplitz operators

Publication Year: 1988, Page(s):1740 - 1748
Cited by:  Papers (24)  |  Patents (1)
| |PDF (580 KB)

Levinson, Lattice and Schur recursions provide alternative ways of computing reflection coefficients for stationary time series. The authors show that when a Toeplitz correlation matrix is a product of two Toeplitz data matrices, as in the correlation method of linear prediction, then the Levinson recursions can be used to derive the Lattice recursions and the Lattice recursions can be used to der... View full abstract»

• ### Performance analysis of the adaptive line enhancer for sinusoidal signals in broad-band noise

Publication Year: 1988, Page(s):1749 - 1757
Cited by:  Papers (15)
| |PDF (532 KB)

The authors extend earlier the optimum value of the decorrelation parameter Δ in the adaptive line enhancer (ALE) to the case of two sinusoidals. They suggested a technique for estimating this optimum choice of Δ in the finite-data case. They studied the performance of the ALE as a spectral estimator. In particular, they studied the asymptotic bias in the frequency estimates produced b... View full abstract»

## Aims & Scope

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

Full Aims & Scope