2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.01CH37221)

7-11 May 2001

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  • 2001 IEEE International Conference on Acoustics, Speech, and Signal Processing Proceedings [front matter]

    Publication Year: 2001, Page(s):i - xci
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  • An adaptive broadband estimator of the fractional differencing coefficient

    Publication Year: 2001, Page(s):3417 - 3420 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (353 KB) | HTML iconHTML

    We consider semiparametric fractional exponential (FEXP) estimators of the memory parameter d for a potentially nonstationary linear long-memory time series with smooth additive trend. We use differencing to annihilate the trend, followed by tapering to handle the potential non-invertibility of the differenced series. We propose a method of pooling the tapered periodogram which leads to more effic... View full abstract»

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  • An iterative solution for the optimal poles in a Kautz series

    Publication Year: 2001, Page(s):3949 - 3952 vol.6
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (301 KB) | HTML iconHTML

    Kautz series allow orthogonal series expansion of finite-energy signals defined on a semi-infinite axis. The Kautz series consists of orthogonalized exponential functions or sequences. This series has as free parameters an ordered set of poles, each pole associated with an exponential function or sequence. For reasons of approximation and compact representation (coding), an appropriate set of orde... View full abstract»

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  • Some of the abstracts listed in the student forum reflect work that was not published in the ICASSP proceedings

    Publication Year: 2001, Page(s):4013 - 4053
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  • Author index

    Publication Year: 2001, Page(s):4055 - 4068
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  • Design of cosine-modulated filter bank prototype filters using the frequency-response masking approach

    Publication Year: 2001, Page(s):3621 - 3624 vol.6
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB) | HTML iconHTML

    We use the frequency-response masking (FRM) approach to design prototype filters for cosine-modulated filter banks in the nearly perfect reconstruction case. With such an approach, it is possible to design a FRM filter with overall order almost equal to the direct-form FIR design, with only slight changes in the values of the inter-carrier and inter-symbol interferences and the attenuation of the ... View full abstract»

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  • An efficient approach for designing nearly perfect-reconstruction cosine-modulated and modified DFT filter banks

    Publication Year: 2001, Page(s):3617 - 3620 vol.6
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB) | HTML iconHTML

    Efficient two-step algorithms are described for optimizing the stopband response of the prototype filter for cosine-modulated and modified DFT filter banks either in the minimax or in the least-mean-square sense subject to the maximum allowable aliasing and amplitude errors. The first step involves finding a good start-up solution using a simple technique. This solution is improved in the second s... View full abstract»

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  • Optimal prefilters for the multiwavelet filter banks

    Publication Year: 2001, Page(s):3613 - 3616 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB) | HTML iconHTML

    This paper proposes a method to obtain optimal 2nd-order approximation preserving prefilters for a given orthogonal unbalanced multiwavelet basis. This procedure uses the prefilter construction introduced in Hardin et al., (1998). The prefilter optimization scheme exploits the Taylor series expansion of the prefilter combined with the multiwavelet. Using the DGHM multiwavelet with the obtained opt... View full abstract»

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  • A true stochastic gradient adaptive algorithm for applications using nonlinear actuators

    Publication Year: 2001, Page(s):3489 - 3492 vol.6
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB) | HTML iconHTML

    This work considers the practical situation where adaptive systems are subject to a saturation nonlinearity at the output of the adaptive filter. Such is the case in active control of noise and vibration. A new adaptive algorithm is proposed which implements the true stochastic gradient approach to the nonlinear problem. Deterministic nonlinear recursions are derived which model the mean weight an... View full abstract»

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  • On the design of Lp IIR filters with arbitrary frequency response

    Publication Year: 2001, Page(s):3829 - 3832 vol.6
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB) | HTML iconHTML

    This paper introduces an iterative algorithm for designing IIR digital filters that minimize a complex approximation error in an Lp sense. The algorithm combines ideas that have proven successful in the similar problem of Lp FIR filter design. We use iterative prefiltering techniques common in applications such as parameter estimation together with an iterative reweighted lea... View full abstract»

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  • Minimum mean square error nonuniform FIR filter banks

    Publication Year: 2001, Page(s):3609 - 3612 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB) | HTML iconHTML

    A theory for jointly optimizing nonuniform analysis and synthesis FIR filter banks with arbitrary filter lengths and an arbitrary delay through the filter bank is developed. The FIR subband coder is optimized with respect to the minimum mean square error between the output and the input signals under a bit constraint. The subband quantizers are modeled as additive noise sources. Theoretical compar... View full abstract»

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  • Recursive Zak transforms and Weyl-Heisenberg expansions

    Publication Year: 2001, Page(s):3541 - 3544 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB) | HTML iconHTML

    We develop algorithms for computing block-recursive Zak transforms and Weyl-Heisenberg expansions, which achieve p/logL and (logM+p)/(logN+logL+1) multiplicative complexity reduction, respectively, over direct computations, where p'=pM, and N-p' is the number of overlapping samples in subsequent signal segments. For each transform we offer a choice of two algorithms based on two different implemen... View full abstract»

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  • Biorthogonal Butterworth wavelets

    Publication Year: 2001, Page(s):3645 - 3648 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB) | HTML iconHTML

    We present a new family of biorthogonal wavelet transforms and a related library of biorthogonal symmetric wavelets. For the construction we use the interpolatory discrete splines which enable us to design perfect reconstruction filter banks related to the Butterworth filters. The construction is performed in a “lifting” manner. The proposed scheme is based on interpolation and, as suc... View full abstract»

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  • Integer fast Fourier transform (INTFFT)

    Publication Year: 2001, Page(s):3485 - 3488 vol.6
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB) | HTML iconHTML

    The concept of integer fast Fourier transform (IntFFT) for approximating the discrete Fourier transform is introduced. Unlike the fixed-point fast Fourier transform (FxpFFT), the new transform has properties that it is an integer-to-integer mapping, power-adaptable and also reversible. A lifting scheme is used to approximate complex multiplications appearing in the FFT lattice structures. Split-ra... View full abstract»

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  • All-pass digital filter design in the frequency-delay domain using the iterative quadratic maximum likelihood algorithm

    Publication Year: 2001, Page(s):3797 - 3800 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB) | HTML iconHTML

    A new domain, termed the frequency-delay is used to design stable, all-pass digital filters resembling a given delay response in the least-squares sense. This spectral technique identifies the delay response of a stable, second-order, all-pass digital filter as a double sideband suppressed carrier amplitude modulated signal in the frequency-delay domain. Iterative maximum likelihood techniques are... View full abstract»

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  • SDP design procedure for energy compaction IIR filters

    Publication Year: 2001, Page(s):3825 - 3828 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB) | HTML iconHTML

    We present a design method for optimal energy compaction IIR filters, where the numerator and denominator may have different degrees. The design is performed via iterative relaxations, where the numerator is optimized given the denominator, followed by optimization of denominator given the numerator. The two optimization problems involved are solved using semidefinite programming (SDP) techniques,... View full abstract»

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  • Perfect reconstruction integer-modulated filter banks

    Publication Year: 2001, Page(s):3605 - 3608 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB) | HTML iconHTML

    We present design methods for perfect reconstruction (PR) integer-modulated filter banks, including biorthogonal (low-delay) filter banks. Both the prototype filter and the modulation sequences are composed of integers, thus allowing efficient hardware implementations. To derive such filter banks, we first extend the PR conditions known for cosine modulation to other, more general, modulation sche... View full abstract»

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  • Harmonic transform

    Publication Year: 2001, Page(s):3537 - 3540 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB) | HTML iconHTML

    The harmonic transform is designed for harmonic signals, which are composed of a base tone and some harmonics (e.g., voiced speech). As a generalization of the Fourier transform, the harmonic transform represents signals by the sum of a base tone and some harmonics, which may give more concise results for harmonic signals than the Fourier transform. Some experiments of speech signals are used to d... View full abstract»

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  • On optimal transforms for subband domain suppression of colored noise

    Publication Year: 2001, Page(s):3661 - 3664 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB) | HTML iconHTML

    Suppose we wish to analyze a noisy signal using a filter bank (FB) and apply noise suppression schemes such as Wiener filters in the subbands of the FB. This paper formalizes and studies the problem of finding the best FB for this purpose. The best FB depends on the class of allowed FB, the type of subband processing, and the statistics of the input signal and additive noise. Recently we have show... View full abstract»

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  • Statistical scaling analysis of TCP/IP data using cascades

    Publication Year: 2001, Page(s):3425 - 3428 vol.6
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB) | HTML iconHTML

    The scaling properties of Internet data are analysed in detail through the unifying viewpoint of infinitely divisible cascades (IDC). From exceptionally precise TCP/IP traffic traces are extracted time series including arrival rate, durations, and interarrival times of TCP connections. We show that IDC offer a pertinent description of these series. Relations between them are investigated, yielding... View full abstract»

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  • Signal-adaptive robust time-varying Wiener filters: best subspace selection and statistical analysis

    Publication Year: 2001, Page(s):3945 - 3948 vol.6
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB) | HTML iconHTML

    We propose a signal-adaptive robust time-varying Wiener filter for nonstationary signal estimation/enhancement. This filter uses projections onto local cosine subspaces and a novel “best subspace” algorithm. It allows efficient online operation including stable online estimation of design parameters. A statistical analysis is provided, and a speech enhancement example is considered View full abstract»

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  • Frame reconstruction of the Laplacian pyramid

    Publication Year: 2001, Page(s):3641 - 3644 vol.6
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB) | HTML iconHTML

    We study the Laplacian pyramid (LP) as a frame operator, and this reveals that the usual reconstruction is suboptimal. With orthogonal filters, the LP is shown to be a tight frame, thus the optimal linear reconstruction using the dual frame operator has a simple structure as symmetrical with the forward transform. For more general cases, we propose an efficient filter bank for reconstruction in th... View full abstract»

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  • An improved energy demodulation algorithm using splines

    Publication Year: 2001, Page(s):3481 - 3484 vol.6
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB) | HTML iconHTML

    A new algorithm is proposed for demodulating discrete-time AM-FM signals, which first interpolates the signals with smooth splines and then uses the continuous-time energy separation algorithm (ESA) based on the Teager-Kaiser energy operator. This spline-based ESA retains the excellent time resolution of the ESA based on discrete energy operators but performs better in the presence of noise. Furth... View full abstract»

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  • The design of equiripple matrix filters

    Publication Year: 2001, Page(s):3793 - 3796 vol.6
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB) | HTML iconHTML

    This paper presents a procedure for deriving linear filters which are based on matrix-vector multiplication instead of linear convolution and which can be designed to match the frequency responses of linear equiripple FIR filters. The magnitude of the matrix filter response is matched to the magnitude response of a given linear FIR filter by solving a set of nonlinear equations numerically using B... View full abstract»

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  • Interior-point methods for magnitude filter design

    Publication Year: 2001, Page(s):3821 - 3824 vol.6
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB) | HTML iconHTML

    We describe efficient interior-point methods for the design of FIR filters with constraints on the magnitude spectrum, for example, piecewise-constant upper and lower bounds, and arbitrary phase. Several researchers have observed that problems of this type can be solved via convex optimization and spectral factorization. The associated optimization problems are usually solved via linear programmin... View full abstract»

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