1996 IEEE International Conference on Acoustics, Speech, and Signal Processing Conference Proceedings

9-9 May 1996

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    Publication Year: 1996
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  • Simultaneous speech segmentation and phoneme recognition using dynamic programming

    Publication Year: 1996, Page(s):3213 - 3216 vol. 6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    In this paper a dynamic programming algorithm for simultaneous speech segmentation and phoneme recognition is presented. Given a sequence of samples of an unknown speech pattern and a library of phonemes, this algorithm finds the best phonological match and, with a backtracking step, identifies the phoneme boundaries. This approach is different from a traditional two step process whereby first the... View full abstract»

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  • Digital oscillators over finite fields

    Publication Year: 1996, Page(s):3209 - 3212 vol. 6
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    This paper shows how the error-free computation properties of finite fields can be used to eliminate aperiodicity and SNR degradation problems in digital oscillators. Galois fields are used to eliminate representation and truncation errors in the values of sinusoid samples. Theorems are presented that characterize the fields which admit all operands necessary for a given phase resolution. Two osci... View full abstract»

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  • Variance mismatch: identifying random-test resistance in DSP datapaths

    Publication Year: 1996, Page(s):3205 - 3208 vol. 6
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    Pseudorandom built-in self-test (BIST) is an attractive means of testing DSP datapath structures as long as the delay and area overhead can be kept low. One obstacle to low-overhead BIST is random-pattern test-resistant datapath structures. We examine the causes of this resistance in some typical DSP datapaths, and introduce variance mismatch as an analytical tool for identifying these test proble... View full abstract»

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  • A unified approach to hierarchical classification

    Publication Year: 1996, Page(s):3430 - 3433 vol. 6
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    This paper examines a novel approach to hierarchical classification by coupling feature optimization and classifier design with feature pruning at each classification stage. We denote this method as a hierarchical sequential pruning classification (HiSPruC) strategy. The backbone of this algorithm is a recursive application of feature ranking and designing a classifier that matches the underlying ... View full abstract»

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  • Iterative maximum-likelihood/cross-correlation algorithm for reflection and pulse TOA estimation

    Publication Year: 1996, Page(s):3133 - 3136 vol. 6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    An iterative method that combines a parametric channel model with the maximum likelihood and cross-correlation estimation techniques has been developed to estimate the reflection, creeping wave, and times of arrival (TOAs) from an echo (backscatter) emanating from a rigid acoustic sphere. The modelled echo is assumed to be more complex than a linear combination of delayed and scaled versions of th... View full abstract»

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  • Control and data flow aspects in the design of a wireless data radio modem: a case study

    Publication Year: 1996, Page(s):3201 - 3204 vol. 6
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    We present the design of a radio modem for the MOBITEX wireless data system. The MOBITEX interface specification defines the protocols that are used for communication between the MOBITEX network and mobile terminal devices. The specification refers to the ISO/OSI standards and defines the link layer and the physical layer of the air-link radio protocol for mobile terminals, as well as the network ... View full abstract»

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  • A chain coding approach for real-time recognition of on-line handwritten characters

    Publication Year: 1996, Page(s):3426 - 3429 vol. 6
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    A novel chain coding approach is proposed for real-time recognition of isolated on-line handwritten English characters. A new type of generalized chain code (GCC) is proposed for lossless encoding of the variably-spaced handwritten data points produced naturally by an electronic writing tablet due to the fixed sampling rate and the variable writing speed. Distinctive features for each character ar... View full abstract»

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  • New perspectives for maximum-likelihood parameter and time delay estimation using two channels

    Publication Year: 1996, Page(s):3129 - 3132 vol. 6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    This paper introduces a new realization for maximum likelihood parameter and time-delay estimation using two channels. We obtain the result by using coupled Karhunen-Loeve expansions to derive the likelihood function. The new realization illuminates the analytical relationship between maximum likelihood time-delay estimation and other methods. Experimental results that support the theoretical find... View full abstract»

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  • Instruction level power profiling

    Publication Year: 1996, Page(s):3326 - 3329 vol. 6
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    This paper describes a method to model the software component of energy dissipation from an architectural description of an embedded system. An embedded system is characterized by a dedicated processor (a DSP processor or an “off the shelf” microprocessor) and the application specific software that runs on it. The hardware model of the system consists of several interacting modules (e.... View full abstract»

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  • A high performance microphone array system for hearing aid applications

    Publication Year: 1996, Page(s):3197 - 3200 vol. 6
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Microphone array technology has been proposed for various audio, teleconference, and hearing aid applications. By forming a focused beam toward the desired speech source, attenuating background noises and rejecting discrete spatial interferers, a microphone array can enhance the SNR/SIR in a noisy environment with significant improvement in speech intelligibility. An array can also perform real ti... View full abstract»

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  • Partial likelihood for real-time signal processing

    Publication Year: 1996, Page(s):3561 - 3564 vol. 6
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    We introduce a unified statistical framework for real-time signal processing with neural networks by using a recent extension of maximum likelihood (ML) estimation, partial likelihood (PL) estimation theory, which allows for (i) dependent observations, and (ii) processing of data using only the information that is available at the time of processing. For a general neural network conditional distri... View full abstract»

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  • Efficient learning of standard finite normal mixtures for image quantification

    Publication Year: 1996, Page(s):3422 - 3425 vol. 6
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    This paper presents an efficient on-line distribution learning procedure of standard finite normal mixtures for image quantification. Based on the standard finite normal mixture (SFNM) model, we formulate image quantification as a distribution learning problem, and derive the probabilistic self-organizing map (PSOM) algorithm by minimizing the relative entropy between the SFNM distribution and the... View full abstract»

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  • Robust time delay estimation using lower-order statistics

    Publication Year: 1996, Page(s):3125 - 3128 vol. 6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    New methods for time delay and frequency delay estimation are introduced based on the theory of alpha-stable distributions. It is shown that these methods are robust for both Gaussian and non-Gaussian impulsive noise environments. Their improved performance is clearly demonstrated with both computer generated data and actual radar clutter data View full abstract»

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  • Hierarchization of a priori defined dataflow subgraphs

    Publication Year: 1996, Page(s):3322 - 3325 vol. 6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    DSP algorithms are frequently represented by dataflow graphs. These graphs serve as an abstract input specification for an implementation, either in software or hardware. While doing so, the transformation process might require a special treatment of specific subgraphs within the complete dataflow graph. A hierarchization of a subgraph appears as a replacement of the subgraph by a single vertex, r... View full abstract»

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  • Broadband eigenvector methods for towed array shape estimation with a single source

    Publication Year: 1996, Page(s):3193 - 3196 vol. 6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    This paper investigates two techniques for extending the narrowband (NB) eigenvector method for towed array shape estimation to process broadband sources. These techniques are the weighted incoherent broadband processor (WIB) and the weighted quasi-coherent broadband processor (WQB). It is demonstrated, both analytically and via computer simulations, that the two broadband processors can dramatica... View full abstract»

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  • Self-organizing feature maps with perfect organization

    Publication Year: 1996, Page(s):3557 - 3560 vol. 6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    The self-organizing feature maps (SOFMs) introduced by Kohonen (1990) have found use in a wide variety of signal processing applications. The goal of SOFMs is to allow encoding of high-dimensional data vectors in such a manner that a vector's relative position in the codebook is related to the information in the vector in as simple a fashion as possible. One measure of the SOFM's performance in ac... View full abstract»

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  • REMAP-experiments with speech recognition

    Publication Year: 1996, Page(s):3350 - 3353 vol. 6
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    We present experimental and theoretical results using a framework for training and modeling continuous speech recognition systems based on the theoretically optimal maximum a posteriori (MAP) criterion. This is in contrast to most state-of-the-art systems which are trained according to a maximum likelihood (ML) criterion. Although the algorithm is quite general, we applied it to a particular form ... View full abstract»

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  • Fast adaptive IIR-MLP neural networks for signal processing applications

    Publication Year: 1996, Page(s):3529 - 3532 vol. 6
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    Neural networks with internal temporal dynamics can be applied to non-linear DSP problems. The classical fully connected recurrent architectures, can be replaced by less complex neural networks, based on the well known multilayer perceptron (MLP) where the temporal dynamics is modelled by replacing each synapses either with an FIR filter or with an IIR filter. A general learning algorithm (back-pr... View full abstract»

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  • Neural network object recognition for inspection of patient setup in radiation therapy using portal images

    Publication Year: 1996, Page(s):3418 - 3421 vol. 6
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    This paper presents a method to improve the performance of inspection of patient setup in radiation therapy using portal images. The proposed algorithm is used to match real-time portal and simulator images which contain the information of patient position relative to the beam position. Two approaches are proposed for this purpose. One approach is to use a multi-scale (multiresolution) analysis of... View full abstract»

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  • A comparison of two techniques for detecting seizure in newborn EEG data

    Publication Year: 1996, Page(s):3101 - 3104 vol. 6
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    This paper considers the problem of automatic classification of newborn electroencephalogram (EEG) data in order to diagnose for seizure. It is shown that good detection performance of seizure EEG is possible using a methodology based on a model for the generation of the EEG. This model is derived from the histology and biophysics of a localised portion of the brain and is thus physically motivate... View full abstract»

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  • Adaptive realization of a maximum likelihood time delay estimator

    Publication Year: 1996, Page(s):3121 - 3124 vol. 6
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    This paper presents an adaptive maximum likelihood method for estimating the time difference of arrival of a source signal at two spatially separate sensors. It is well-known that the maximum likelihood technique achieves the Cramer-Rao lower bound for time delay estimation error for certain signal conditions. The α-β tracker is a heuristic mechanism that is heavily used in target track... View full abstract»

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  • Optimal communication scheduling based on collision graph model

    Publication Year: 1996, Page(s):3318 - 3321 vol. 6
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    While research on the static scheduling of computational tasks for parallel systems has been ongoing for years, most work does not consider the communication costs nor does it consider the network congestion. A new static scheduling technique is presented which focuses on the communication overhead inherent in parallel processing systems. This paper builds a framework based on a newly developed gr... View full abstract»

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  • Interpolated array minimum variance beamforming for correlated interference rejection

    Publication Year: 1996, Page(s):3165 - 3168 vol. 6
    Cited by:  Papers (6)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    Signal cancellation causes the performance of conventional adaptive beamformers to severely deteriorate in environments containing interference sources that are correlated with the signal. We propose an algorithm which overcomes the signal cancellation problem for wideband signals. The proposed algorithm applies array manifold interpolation to perform frequency domain averaging, which reduces the ... View full abstract»

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  • Gerschgorin radii based source number detection for closely spaced signals

    Publication Year: 1996, Page(s):3053 - 3056 vol. 6
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    We first analyze the resolution performance of the Gerschgorin radii based source number detector proposed by Wu, Yang and Chen (see IEEE Trans. SP, vol.43, no.6, p.1325-33, 1995) for independent closely-spaced plane waves. Based upon the analysis, we can easily verify the resolution threshold of the Gerschgorin radii based algorithm. For improvement of the detection performance, we then further p... View full abstract»

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