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IEEE Signal Processing Letters

Issue 11 • Date Nov. 1999

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Displaying Results 1 - 6 of 6
  • A fast second-generation encoding algorithm for vector quantization

    Publication Year: 1999, Page(s):277 - 280
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (79 KB)

    This paper presents a fast encoding algorithm for vector quantization that uses edge information contained in an image in addition to the use of average values of the vectors forming the image. The algorithm makes use of these features to identify the visually significant areas of the image and to save computational time while producing good quality pictures at reasonable computing cost. The simul... View full abstract»

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  • Adaptive harmonic fractional Fourier transform

    Publication Year: 1999, Page(s):281 - 283
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1144 KB)

    A novel adaptive harmonic fractional Fourier transform is proposed for analysis of voiced speech signals. It provides a higher concentration than the short time Fourier transform (STFT) and avoids the cross interference components produced by the Wigner-Ville distribution and other bilinear representations. The proposed method rotates the base tone and harmonics in time-frequency domain. After the... View full abstract»

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  • Subband coding of cyclostationary signals with static bit allocation

    Publication Year: 1999, Page(s):284 - 286
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (147 KB)

    We consider the optimal orthonormal subband coding of zero mean wide sense cyclostationary signals (WSCS), with N-periodic second order statistics. An M-channel uniform filterbank, with N-periodic analysis and synthesis filters, is used as the subband coder. A static bit allocation scheme is used. An average variance condition is used to measure the output distortion. The conditions for maximizing... View full abstract»

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  • Nonlinear systems and exponential eigenfunctions

    Publication Year: 1999, Page(s):287 - 289
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (59 KB)

    It has been shown previously that homogeneous time-invariant systems produce exponential outputs in response to similar exponential inputs, but that the concepts of "impulse response" and "frequency response" are of little use for their analysis. It was also asked whether there exist more general classes of systems with exponential eigenfunctions. In this paper, we recall that the concepts of impu... View full abstract»

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  • Some remarks on the lattice form of the Steiglitz-McBride iteration

    Publication Year: 1999, Page(s):290 - 292
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (126 KB)

    It is shown that the offline Steiglitz-McBride (1965) identification method may present stable limit cycles and even chaotic behavior when implemented in lattice form. Moreover, we also show that even under ideal conditions (i.e., with an adaptive filter of sufficient order and with noiseless measurements), the stationary point corresponding to identification of the unknown system need not be a co... View full abstract»

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  • Natural gradient algorithm for blind separation of overdetermined mixture with additive noise

    Publication Year: 1999, Page(s):293 - 295
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (116 KB)

    We study the natural gradient approach to blind separation of overdetermined mixtures. First we introduce a Lie group on the manifold of overdetermined mixtures, and endow a Riemannian metric on the manifold based on the property of the Lie group. Then we derive the natural gradient on the manifold using the isometry of the Riemannian metric. Using the natural gradient, we present a new learning a... View full abstract»

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Aims & Scope

The IEEE Signal Processing Letters is a monthly, archival publication designed to provide rapid dissemination of original, cutting-edge ideas and timely, significant contributions in signal, image, speech, language and audio processing.

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Editor-in-Chief
Peter Willett
University of Connecticut
Storrs, CT 06269
peter.willett@uconn.edu