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IEEE Signal Processing Letters

Issue 8 • Date Aug. 2000

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Displaying Results 1 - 9 of 9
  • Blockiness detection for MPEG2-coded video

    Publication Year: 2000, Page(s):213 - 215
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (581 KB)

    Using both the amplitude and phase information of the harmonics generated by block artefacts in MPEG2 coded video, it is possible to estimate the blockiness in MPEG2 coded video accurately without the reference signal, achieving correlation of 0.88. View full abstract»

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  • A vector-regression tree for generating energy contours

    Publication Year: 2000, Page(s):216 - 218
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (54 KB)

    This letter presents a novel approach based on the vector-regression tree to generate energy contours. Given linguistic features, our approach predicts a vector containing ten sampled energy values for each phone by using a vector-regression tree, concatenates the vectors, and computes energy values at 10 ms intervals by linear interpolation. The correlation coefficient for the observed and predic... View full abstract»

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  • Systems with exponential eigenfunctions and exponential-input/constant-output operators

    Publication Year: 2000, Page(s):219 - 220
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (41 KB)

    Vaidyanathan (1999) and Ferreira (1999) reported on nonlinear systems with exponential eigenfunctions. In this letter, we introduce a larger class of such systems, generated from a special family of exponential-input/constant-output operators that capture exponential signals from general inputs. In particular, we extend the classes of systems with exponential eigenfunctions defined in Vaidyanathan... View full abstract»

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  • A new design method for two-channel perfect reconstruction IIR filter banks

    Publication Year: 2000, Page(s):221 - 223
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (73 KB)

    In this paper, a new method for designing perfect reconstruction (PR) two-channel causal stable IIR filter banks is introduced. It is based on a structure previously proposed by Phoong et al. (1995). By using a combination of allpass and linear-phase FIR functions, the bumping problem found in the conventional structural PR filter bank is significantly suppressed. The design problem is formulated ... View full abstract»

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  • A modified design to eliminate passband anomaly in weighted minimax quadrature mirror filters

    Publication Year: 2000, Page(s):224 - 226
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (72 KB)

    It is known that quadrature mirror filters (QMFs) designed using the algorithm in Lim and Yang (1993) suffer from passband anomaly under certain conditions. A modification to this algorithm was proposed in Goh et al. (1996) to overcome this anomaly. However, this design is not a general solution for different stopband edge frequencies. In this paper, we propose a more robust technique to design QM... View full abstract»

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  • Moment-based fast discrete sine transforms

    Publication Year: 2000, Page(s):227 - 229
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (85 KB)

    This paper presents a novel approach to compute discrete sine transforms (DSTs). By using a modular mapping, DSTs are approximated by the sum of a finite sequence of discrete moments. Hence, by extending our earlier technique in computing moments with an adder network only, DSTs can also be implemented easily by a systolic array primarily involving additions. The method can be applied to multidime... View full abstract»

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  • GMDF for noise reduction and echo cancellation

    Publication Year: 2000, Page(s):230 - 232
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (62 KB)

    A noise-reduction (NR) enhancement to the generalized multi-delay frequency domain algorithm (GMDF) involving minimal additional computations is presented. Findings are presented on the ability of the algorithm to suppress street, office, air-conditioning and car noise from the microphone signal in hands-free telephony. For an additional eleven N/P real multiplies and eight N/P real additions per ... View full abstract»

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  • Residual noise reduction in sign algorithm

    Publication Year: 2000, Page(s):233 - 234
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (39 KB)

    The residual noise of the sign algorithm can be reduced by adding a uniformly distributed noise (dithering) to the sign algorithm input signal. In this paper, a simple equation for the residual noise reduction factor (RNRF) is derived for the case in which the noise in the sign algorithm input signal has a two-level discrete amplitude distribution. It is demonstrated that the RNRF is proportional ... View full abstract»

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  • Piecewise-linear maps

    Publication Year: 2000, Page(s):235 - 237
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (57 KB)

    Chaotic signals generated by iterating piecewise-linear (PWL) maps on the unit interval are highly attractive in a wide range of signal processing applications. In this letter, optimal estimation algorithms for signals generated by iterating PWL maps and observed in white noise are derived based on the method of maximum likelihood (ML). It is shown how the phase space of the map may be decomposed ... 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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Meet Our Editors

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