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Maximally Flat Lowpass FIR Filters with Reduced Delay
 IEEE TRANS. ON CIRCUITS AND SYSTEMS II
, 1998
"... This paper describes a new class of nonsymmetric maximally flat lowpass FIR filters. By subjecting the magnitude and group delay responses (individually) to differing numbers of flatness constraints, the new filters are obtained. It is found that these filters achieve a smaller delay than symmetric ..."
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This paper describes a new class of nonsymmetric maximally flat lowpass FIR filters. By subjecting the magnitude and group delay responses (individually) to differing numbers of flatness constraints, the new filters are obtained. It is found that these filters achieve a smaller delay than symmetric filters while maintaining relatively constant group delay around ! = 0, with no degradation of the frequency response magnitude. The design of these filters is initially investigated using Grobner bases. An analytic design technique, applicable to a subset of the forgoing filters, is provided that does not depend on Grobner basis computations.
Y.CPark. A minimax approach for the joint design of acoustic crosstalk cancellation filters
 IEEE Transactions on Audio, Speech and Language Processing
, 2007
"... Abstract—This paper presents a method for jointly designing immersive audio rendering filters for a single listener using loudspeakers. The filters for crosstalk cancellation are assumed to have finite impulse responses and are designed using the minimax criterion. In addition to the traditional At ..."
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Abstract—This paper presents a method for jointly designing immersive audio rendering filters for a single listener using loudspeakers. The filters for crosstalk cancellation are assumed to have finite impulse responses and are designed using the minimax criterion. In addition to the traditional Atal–Schroeder crosstalk canceler structure, this paper explores an alternate topology that requires the approximation of a single filter. In general, the minimax approach provides improved lowfrequency performance leading to a better overall separation of the directpath and crosspath transfer functions than leastsquares designs. The performance of the singlefilter structure is better than that of the traditional crosstalk cancellation structure. Index Terms—Acoustic signal processing, crosstalk, loudspeakers, minimax methods. I.
On a class of almost orthogonal polynomials
"... Abstract. In this paper, we define a new class of almost orthogonal polynomials which can be used successfully for modelling of electronic systems which generate orthonormal basis. Especially, for the classical weight function, they can be considered like a generalization of the classical orthogona ..."
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Abstract. In this paper, we define a new class of almost orthogonal polynomials which can be used successfully for modelling of electronic systems which generate orthonormal basis. Especially, for the classical weight function, they can be considered like a generalization of the classical orthogonal polynomials (Legendre, Laguerre, Hermite,...). They are very suitable for analysis and synthesis of imperfect technical systems which are projected to generate orthogonal polynomials, but in the reality generate almost orthogonal polynomials.
Performance Of Complex Chebyshev Approximation In DelayRootNyquist Filter Design
"... : RootNyquist filters are crucial components in data communications and recently the ability to attach fractional sample delay attributes to them has become very important. Here we explore the application of Chebyshev approximation to design of such filters. Special attention is paid to the use of ..."
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: RootNyquist filters are crucial components in data communications and recently the ability to attach fractional sample delay attributes to them has become very important. Here we explore the application of Chebyshev approximation to design of such filters. Special attention is paid to the use of the KaramMcClellan algorithm, a fully complex extension of the wellestablished ParksMcClellan algorithm, which delivers peak error performance improvement in the region of one dB or better. 1. BACKGROUND The Alternation Theorem underlying Chebyshev FIR filter approximation has, until very recently, been restricted to realonly transfer function targets. The attraction of the ParksMcClellan program implementing the Remez Exchange Algorithm has been primarily due to the nature of its quality guarantees and its wellcharacterized reliable capabilities in delivering linearphase FIR filter designs. Of course, these are usually cast as singlecomponent (realonly or else imaginaryonly) transf...
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"... Presentation and objective evaluation of methods to predict gestures on a network. ..."
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Presentation and objective evaluation of methods to predict gestures on a network.
Efficient Design Of Digital Filters For 2D And 3D Depth Migration
"... Two and threedimensional depth migration can be performed using one and twodimensional extrapolation digital filters, respectively. The depth extrapolation is done, one frequency at a time, by convolving the seismic wavefield with a complexvalued, frequencyand velocitydependent, digital filter. ..."
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Two and threedimensional depth migration can be performed using one and twodimensional extrapolation digital filters, respectively. The depth extrapolation is done, one frequency at a time, by convolving the seismic wavefield with a complexvalued, frequencyand velocitydependent, digital filter. This process requires the design of a complete set of extrapolation filters, one filter for each possible frequencyvelocity pair. Instead of independently designing the frequency and velocitydependent filters, an efficient procedure is introduced for designing a complete set of one and twodimensional extrapolation filters using transformations. The problem of designing a desired set of migration filters is thus reduced to the design of a single onedimensional filter which is then mapped to produce all the desired one or twodimensional migration filters. The new design procedure has the additional advantage that both the one and twodimensional migration filters can be realized effi...
doi:10.1155/2010/398385 Research Article Contourlet Filter Design Based on Chebyshev Best
"... which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The contourlet transform can deal effectively with images which have directional information such as contour and texture. In contrast to wavelets for which there exists many go ..."
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which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The contourlet transform can deal effectively with images which have directional information such as contour and texture. In contrast to wavelets for which there exists many good filters, the contourlet filter design for image processing applications is still an ongoing work. Therefore, this paper presents an approach for designing the contourlet filter based on the Chebyshev best uniform approximation for achieving an efficient image denoising applications using hidden Markov tree models in the contourlet domain. Here, we design both the optimal 9/7 wavelet filter banks with rational coefficients and new pkva 12 filter. In this paper, the Laplacian pyramid followed by the direction filter banks decomposition in the contourlet transform using the two filter banks above and the image denoising applications in the contourlet hidden Markov tree model are implemented, respectively. The experimental results show that the denoising performance of the test image Zelda in terms of peak signaltonoise ratio is improved by 0.33 dB than using CDF 9/7 filter banks with irrational coefficients on the JPEG2000 standard and standard pkva 12 filter, and visual effects are as good as compared with the research results of Duncan D.Y. Po and Minh N. Do. 1.
TNO Physics and Electronics Laboratory,
"... World wide a concern is emerging about the influence of manmade sound in the sea on marine life, and particularly about high power active sonars systems. Most concern lies with marine mammals, which fully depend on sound in their natural behaviour (foraging, navigation and communication). One of th ..."
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World wide a concern is emerging about the influence of manmade sound in the sea on marine life, and particularly about high power active sonars systems. Most concern lies with marine mammals, which fully depend on sound in their natural behaviour (foraging, navigation and communication). One of the sonars under debate is the Low Frequency Active Sonar (LFAS). This type of system is designed for long range detection of submarines. It consists of a powerful source and a towed array receiver. Incidents with marine mammals could be avoided if the receiver that is dedicated to detection of submarine echoes, is equipped with Detection, Classification and Localisation capabilities for marine mammals as well. In this paper the development of a prototype transient detector and classifier for the TNOFEL LFAS array (named CAPTAS) is described. A broadband beamformer is developed that creates 8 beams (sectors) that are equally wide over the whole frequency band. A multibeam LOFAR display is presented. On the normalised data a Page’s test detector is applied that is “optimum ” for signals with unknown duration. Detected transients are sent to a classifier that tries to discriminate between biological and man
An Efficient Method for Designing TwoChannel PR FIR Filter Banks with Low System Delay
"... Abstract—In this paper, an efficient method for designing perfect reconstruction (PR) twochannel finite impulse response (FIR) filter banks with low system delay is proposed. It is based on the use of nonlinearphase FIR function in a structure previously proposed by Phoong et al. [1]. The design ..."
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Abstract—In this paper, an efficient method for designing perfect reconstruction (PR) twochannel finite impulse response (FIR) filter banks with low system delay is proposed. It is based on the use of nonlinearphase FIR function in a structure previously proposed by Phoong et al. [1]. The design problem is formulated as a complex polynomial approximation problem and is solved effectively using the Remez exchange algorithm with very low design complexity. Design examples show that filter banks with flexible stopband attenuation and system delay can be readily obtained by the proposed algorithm. Index Terms—Design method, filter banks, low system delay, perfect reconstruction, Remez exchange algorithm, twochannel. I.