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IEEE Signal Processing Letters

Issue 1 • Date Jan. 2001

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Displaying Results 1 - 8 of 8
  • Adaptive impulse detection using center-weighted median filters

    Publication Year: 2001, Page(s):1 - 3
    Cited by:  Papers (306)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (65 KB) | HTML iconHTML

    Previous median-based impulse detection strategies tend to work well for fixed-valued impulses but poorly for random-valued impulse noise, or vice versa. This letter devises a novel adaptive operator, which forms estimates based on the differences between the current pixel and the outputs of center-weighted median (CWM) filters with varied center weights. Extensive simulations show that the propos... View full abstract»

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  • Adaptive context-based arithmetic coding of arbitrary contour maps

    Publication Year: 2001, Page(s):4 - 6
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (68 KB) | HTML iconHTML

    An efficient technique for encoding arbitrary contours is presented. It is based on the concept of transition points of a contour map and relies on a new four-symbol adaptive context-based arithmetic encoder (CAE) that calculates contexts in the (binary) domain of the contour map. The results obtained with this new technique, applied to the compression of image partitions, are substantially better... View full abstract»

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  • Estimation of terrain elevation by multifrequency interferometric wide band SAR data

    Publication Year: 2001, Page(s):7 - 9
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (55 KB) | HTML iconHTML

    We present a phase unwrapping method using a maximum likelihood estimation technique together with frequency diversity information to reconstruct highly discontinuous ground elevation profiles. Frequency diversity can be obtained by considering the interferograms obtained by different couples of subband images. View full abstract»

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  • Wavelet speech enhancement based on the Teager energy operator

    Publication Year: 2001, Page(s):10 - 12
    Cited by:  Papers (81)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (74 KB) | HTML iconHTML

    We propose a new speech enhancement method based on the time adaption of wavelet thresholds. The time dependence is introduced by approximating the Teager energy of the wavelets coefficients. This technique does not require an explicit estimation of the noise level or of the a priori knowledge of the SNR, which is usually needed in most of the popular enhancement methods. Performance of the propos... View full abstract»

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  • Experimental evaluation of cross-talk cancellation regarding loudspeakers' angle of listening

    Publication Year: 2001, Page(s):13 - 15
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (378 KB) | HTML iconHTML

    The reproduction of three-dimensional (3-D) sound (either from binaural recordings or virtual source synthesis) through loudspeakers, also known as transauralization, adds difficulties to the traditional method using headphones: the cross-talk effect between speakers and the listener's ears must be taken into account. The common way of removing this distortion consists of placing a filter bank bef... View full abstract»

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  • An efficient method for designing two-channel PR FIR filter banks with low system delay

    Publication Year: 2001, Page(s):16 - 19
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (114 KB) | HTML iconHTML

    In this paper, an efficient method for designing perfect reconstruction (PR) two-channel finite impulse response (FIR) filter banks with low system delay is proposed. It is based on the use of nonlinear-phase FIR function in a structure previously proposed by Phoong et al. (see IEEE Trans. Signal Processing, vol.43, p.649-64, Mar. 1995). The design problem is formulated as a complex polynomial app... View full abstract»

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  • A novel adaptation scheme in the NLMS algorithm for echo cancellation

    Publication Year: 2001, Page(s):20 - 22
    Cited by:  Papers (12)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (70 KB) | HTML iconHTML

    This paper presents a new normalized least mean square (NLMS) adaptation scheme for echo cancellation. The scheme combines the advantages of the conventional Geigel algorithm with some initiative ideas. The Geigel is used for rough detection of double talk or echo path change within a short delay period, while a new control mechanism is proposed for further accurate discrimination of double talk a... View full abstract»

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  • 2-D lattice discrete filters: minimal delay and state space realization

    Publication Year: 2001, Page(s):23 - 25
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (41 KB) | HTML iconHTML

    A circuit realization is presented for two-dimensional (2-D) lattice discrete filters. The number of delay elements is minimal. Based on this circuit realization, the corresponding state space realization is derived. The matrices A, b, c', and the scalar d of the 2-D state space model are presented in generalized form. The dimension of the 2-D state space vector is minimal, and the corresponding t... 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