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Digital Signal Processing Workshop Proceedings, 1996., IEEE

Date 1-4 Sept. 1996

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  • 1996 IEEE Digital Signal Processing Workshop Proceedings

    Publication Year: 1996
    Request permission for commercial reuse | PDF file iconPDF (636 KB)
    Freely Available from IEEE
  • Author index

    Publication Year: 1996, Page(s):519 - 521
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    Freely Available from IEEE
  • Critical band quantisation analysis for masked distortion speech coding

    Publication Year: 1996, Page(s):165 - 168
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    This paper presents new results on critical band masked distortion controlled quantisation of a linear transform representation of speech. In particular, fixed rate split vector quantisation of a critical band gain vector is investigated. While shown to be objectively significant in meeting masked distortion criteria, near-transparent quantisation of the critical band gain spectrum is nonetheless ... View full abstract»

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  • Towards optimal LPC spectral parameters estimation in standard CELP 4800 b/s speech coder

    Publication Year: 1996, Page(s):161 - 164
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The influence of nonuniform scalar quantization and the specific interpolation procedure of LSP parameters, as proposed in USA FED STD 1016 CELP 4800 b/s speech coder, to the LPC spectra of speech obtained by using four standard LPC methods: autocorrelation with Hamming window, covariance, modified covariance and lattice, is considered. Comparative experimental analysis is done referring to the re... View full abstract»

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  • Multirate modeling of human ear frequency resolution for hearing aids

    Publication Year: 1996, Page(s):157 - 160
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    A real-time multirate filtering design project, as an application in digital hearing aids, has been developed. The motivation is that it allows nonuniform frequency resolution which automatically leads us to use different decimators for different frequency bandwidths. Therefore, a variation of the tree structured multirate multistage filter bank is exploited with six pairs of polyphase filters for... View full abstract»

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  • Optimal vector pyramidal and subband decompositions for the coding of multichannel signals

    Publication Year: 1996, Page(s):85 - 88
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    Filters are determined which achieve optimal construction of multiresolution vector sequences by minimizing the variance of the error signals between successive pyramid levels. A measure of the entropy reduction achieved by the pyramid is in this way maximized. Further, the filters are also determined which minimize the error committed when only the low resolution vector signal is retained from a ... View full abstract»

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  • The effect of modified filter distribution on an adaptive, sub-band speech enhancement method

    Publication Year: 1996, Page(s):153 - 156
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    An adaptive noise cancellation scheme for speech processing is described, in which adaptive filters operate in frequency-limited sub-bands. Previously the filters had been distributed in a linear fashion in the frequency domain. This work investigates the effects of spacing the filters more in sympathy with the signal power and spectral characteristics. It is found that improvements in signal-to-n... View full abstract»

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  • Features of a discrete Wigner distribution

    Publication Year: 1996, Page(s):427 - 430
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    We discuss important attributes of a discrete Wigner distribution derived using a group-theoretic approach. The nature of this approach enables this distribution to satisfy numerous mathematical properties, including marginals and the Weyl (1964) correspondence. A few issues concerning the relationship of this distribution with group theory are explored in detail. In particular, the discrete distr... View full abstract»

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  • Finding the right wavelet for image compression: on the relevance of criteria

    Publication Year: 1996, Page(s):53 - 56
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Finding the right wavelet is a crucial problem in wavelet-based image compression. Several criteria for choosing the right wavelet have been presented during the last years, but have never been evaluated together under equivalent conditions. We review some of them, present one additional criterion, the shift variance of compressed impulses, and show the results of an extensive evaluation using par... View full abstract»

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  • Identification of voiceband data signal constellations using a divisive cluster algorithm

    Publication Year: 1996, Page(s):474 - 477
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    A divisive cluster algorithm has been applied to identify the type of signal constellation used by a voice band modem. Tests with simulated signals showed that this cluster technique is capable to classify a variety of voiceband signals in use (DPSK2A/B, DPSK4A/B, V.29, V.29Fallback (7.2 kbit/s) and V.32Fallback (9.6kbit/s)). Compared to former proposed algorithms to classify linear digital modula... View full abstract»

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  • Optimal hierarchical decompositions for signals coded using Lloyd-Max quantizers

    Publication Year: 1996, Page(s):81 - 84
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Optimal hierarchical coding is sought, for progressive or scalable image transmission, by minimizing the variance of the error difference between the original image and its lower resolution renditions. The optimal, according to the above criterion, pyramidal and subband image coders are determined for images quantized using the optimal vector Lloyd-Max quantizers. A rigorous statistical model of a... View full abstract»

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  • Noniterative reconstruction of band limited signals and coding techniques

    Publication Year: 1996, Page(s):149 - 152
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    In this paper we propose linear iterative and noniterative algorithms which can efficiently correct a subset of t samples of a signal, whose values might have been corrupted, possibly due to noise, clipping, or any other reasons. We discuss the applicability of techniques used in error correcting codes to this problem, and the possibility of determining the location of the erroneous samples in ove... View full abstract»

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  • Studying the performances of linear signature detector on a time-frequency representation

    Publication Year: 1996, Page(s):423 - 426
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    This paper deals with automatic recognition of time-frequency signatures. In particular, we are interested in linear structures in the time-frequency plane. These signatures are detected by their boundary in the time-frequency plane. Then, shapes are compared to a rectangular model using a distance evaluation on Fourier descriptors. The value of the distance allows the decision if the considered b... View full abstract»

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  • A comparison of different optimized structures of filter banks for video coding

    Publication Year: 1996, Page(s):49 - 52
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    Optimized perfect reconstruction octave-band two-stage and three-stage tree-structured filter banks and optimized uniform four-channel and eight-channel filter banks are compared for hybrid video coding. The filter coefficients are optimized at each stage for subband coding gain for nonuniform filter banks. Six types of frequency partitionings are presented to compare the efficient utilization of ... View full abstract»

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  • Fractionally spaced blind maximum likelihood sequence detection over fast fading fractionally-spaced channels

    Publication Year: 1996, Page(s):470 - 473
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    Maximum likelihood sequence detection (MLSD) for channels with intersymbol interference has previously required estimation of the channel impulse response. Adaptive estimators often fail to track adequately and are a major source of detector deterioration. Symbol-spaced detectors are also sensitive to both the sample timing phase, φg, of the received signal and to channels with frac... View full abstract»

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  • Fractal and linear pyramids

    Publication Year: 1996, Page(s):77 - 80
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    Pyramids are data structures with multiresolution information that have been applied successfully on many image processing and analysis tasks. We compare the properties of fractal and linear pyramids. The relations between the levels of a fractal pyramid are studied, generalising the results obtained by Baharav et al. (see Fractal Compression: Theory and applications to Digital Images, chapter 5, ... View full abstract»

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  • An MPEG-2 video decoder DSP architecture

    Publication Year: 1996, Page(s):199 - 202
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    The MPEG-2 video standard is a generic international standard for applications such as digital storage media, television broadcasting, and multimedia. A novel MPEG-2 video decoder architecture is presented. The use of dedicated processing elements in an asynchronous communication structure gives a high degree of modularity. A semi-static scheduling scheme is used to keep the resource utilization h... View full abstract»

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  • A two-band linear-phase QMF lattice with an improved robustness to coefficient quantization

    Publication Year: 1996, Page(s):145 - 148
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    In this paper we examine the design problem of a new lattice structure for two-band perfect reconstruction filter banks with linear phase analysis and synthesis filters. The aim is to provide sets of lattice coefficients which are robust to quantization. Two complementary methods are presented which are key elements to derive low dynamic range solutions while satisfying given frequency specificati... View full abstract»

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  • Teaching wavelets with Java on the information superhighway

    Publication Year: 1996, Page(s):101 - 104
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (892 KB)

    One of the most exciting new developments on the information superhighway is the Java language of the Sun Microsystem. Java is portable, powerful, and network-aware. This paper presents some ideas and experiments on teaching wavelets and signal processing using Java View full abstract»

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  • The application of digital signal processing to acoustic pyrometry

    Publication Year: 1996, Page(s):420 - 422
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    This paper describes digital signal processing methods that are being applied to acoustic pyrometry. The hostile environment and high background noise encountered in the furnace volume of large utility, recovery and waste-to-energy boilers requires the application of robust signal processing methods in order to extract the flight times of acoustic waves passing through the combustion zone. Multipa... View full abstract»

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  • Transparent robust authentication and distortion measurement technique for images

    Publication Year: 1996, Page(s):45 - 48
    Cited by:  Papers (10)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB)

    We propose a novel scheme to embed an invisible signature into an image to check image integrity and measure its distortion. The technique is based on the pseudo-noise sequences and visual masking effects. The values of an image are modified by a pseudo-noise signature which is shaped by the perceptual thresholds from masking effects. The method is robust and can gauge errors accurately up to half... View full abstract»

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  • Application of cone detectors to detection of signals in structured interference

    Publication Year: 1996, Page(s):466 - 469
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The paper addresses a specific case of the detection of signals in noisy environments. In the situation to be considered, noise is modeled as additive Gaussian noise. Signals, and interference of known structure, are modeled as belonging to linear subspaces. The paper reviews and extends previous work on this problem by applying cone classes to model additional information of the relative energy o... View full abstract»

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  • Smooth biorthogonal wavelets for applications in image compression

    Publication Year: 1996, Page(s):73 - 76
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    We introduce a new family of smooth, symmetric biorthogonal wavelet basis. The new wavelets are a generalization of the Cohen, Daubechies and Feauveau (CDF) biorthogonal wavelet systems proposed in 1992. Smoothness is controlled independently in the analysis and synthesis bank and is achieved by optimization of the discrete finite variation (DFV) measure introduced for orthogonal wavelet design. T... View full abstract»

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  • Wave digital simulation of transmission lines with arbitrary initial potential and current distributions

    Publication Year: 1996, Page(s):195 - 198
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A method for simulating transients on coupled transmission lines by means of multidimensional wave digital filter (MWDF) techniques is proposed. The suggested method allows one to treat arbitrary initial potential and current distributions as well as boundary conditions originating from linear lumped element terminations. Moreover, the method is also applicable to nonuniform transmission lines wit... View full abstract»

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  • A noise cancellation algorithm based on hypergraph modeling

    Publication Year: 1996, Page(s):5 - 8
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (556 KB)

    Although the binary relations used in proximity graphs are relevant for many basic situations, they cannot represent the structuration process of digital images. In this paper we show that hypergraph theory is a more appropriate frame to describe the neighborhood relations that can be formalized between pixels. We illustrate the effectiveness of such a model by deriving a noise cancellation algori... View full abstract»

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