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Acoustics, Speech, and Signal Processing, 1989. ICASSP-89., 1989 International Conference on

Date 23-26 May 1989

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Displaying Results 1 - 25 of 711
  • A locus model of coarticulation in an HMM speech recognizer

    Publication Year: 1989, Page(s):97 - 100 vol.1
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    A novel type of hidden Markov model (HMM) has been developed to account explicitly for the context-dependent vowel acoustic transitions in consonant-vowel and vowel consonant phonetic environments. The major difference between this type of HMM and the standard Gaussian HMM is that the Gaussian mean vectors associated with the vowel HMM states, which are intended to model the vowel acoustic transit... View full abstract»

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  • ICASSP-89: 1989 International Conference on Acoustics, Speech and Signal Processing (IEEE Cat. No.89CH2673-2)

    Publication Year: 1989
    Request permission for commercial reuse | PDF file iconPDF (54 KB)
    Freely Available from IEEE
  • An order recursive algorithm for synthesizing linear recursive filters

    Publication Year: 1989, Page(s):1131 - 1133 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (149 KB)

    The author proposes an order recursive algorithm to compute efficiently the solution to the set of linear equations for finding the parameters of a recursive filter whose unit impulse response best approximates that of the prescribed ideal response. The algorithm requires only O(p/sup 2/) operations. The inherent structure of the coefficient matrix in the system of linear equations and the inversi... View full abstract»

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  • Knowledge based parallel recognition of handwritten alphanumerics

    Publication Year: 1989, Page(s):1807 - 1810 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (238 KB)

    A novel knowledge-based parallel processing system has been designed for recognition of handwritten characters. With five quadtree-linked microprocessors, this system can extract features from the character image in four directions simultaneously. Through repetitive order-giving and information-gathering between the master and the slaves, the system can process the information at two levels: globa... View full abstract»

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  • Primitive-based teleconference image coding technique

    Publication Year: 1989, Page(s):1933 - 1936 vol.3
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    An image coding technique with the capability of producing good image quality at a compression ratio over 1000:1 is described. The main idea is to break the image into complicated primitives using a priori knowledge. Usually these primitives are not coded and transmitted, but are matched to a previously created database, and the necessary information about the best match is coded and transmitted. ... View full abstract»

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  • A 24 bit DSP for motion video codec and software development support system

    Publication Year: 1989, Page(s):1929 - 1932 vol.3
    Cited by:  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The authors describe the architecture of a digital signal processor (DSP) well suited for motion video coding and its software development support tools. The DSP, named DISP (digital image signal processor), is image-coding oriented. It consists of several specified resources optimized for video signal processing, such as two-dimensional addressing and a combined arithmetic operation function. A s... View full abstract»

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  • Original TV coding scheme for 34 Mbit/s

    Publication Year: 1989, Page(s):1925 - 1928 vol.3
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    The author describes a coding scheme for color television signals over 34 Mb/s channels. Spatio-temporal blocks are used to reduce both the spatial and temporal redundancies within the blocks; the blocks are independent of one another and of fixed size (5×3×4). Spatial interpolation and temporal prediction are used, along with luminance masking on itself as well as on the chrominance s... View full abstract»

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  • Adaptive transform coding via quadtree-based variable blocksize DCT

    Publication Year: 1989, Page(s):1854 - 1857 vol.3
    Cited by:  Papers (32)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    An adaptive transform coding algorithm using a quadtree-based variable blocksize DCT (discrete cosine transform) is introduced to achieve a better tradeoff between bit rate and image quality. The choice of appropriate blocksize is determined by a mean-based decision rule that can discriminate various image contents for better visual quality. Some simulation results are given. It is found that the ... View full abstract»

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  • Motion compensated 3-dimensional wave-form image coding

    Publication Year: 1989, Page(s):1921 - 1924 vol.3
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    The author proposes a technique for incorporate motion compensation in a general 3-D waveform coding environment. Examples are given for 3-D subband and DCT (discrete cosine transform) coding where motion compensation yields significant improvements as compared to the same technique without motion compensation. It is concluded that, for low rates, 3-D motion-compensated subband coding is a very ef... View full abstract»

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  • Hardware implementation of trellis coded quantization

    Publication Year: 1989, Page(s):857 - 860 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    An implementation of trellis coded quantization (TCQ) of memoryless sources on dedicated digital signal processing hardware is described. The effect of encoding delay (i.e. the TCQ symbol release rule) on the overall encoding performance is evaluated. It is shown that quite modest encoding delays cause negligible loss in performance, compared to very long (e.g. 1000 sample) trellis search depths. ... View full abstract»

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  • Algorithm-based fault-tolerant techniques for MVDR beamforming

    Publication Year: 1989, Page(s):2417 - 2420 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    The authors present novel fault-tolerance schemes for 2-D systolic implementation of a recursive least squares minimization problem with applications to beamforming problems. They show that the errors can be detected by examining only a few scalars. In the case of the transient errors the technique is self-correcting. The technique can be implemented with negligible algorithm modification and litt... View full abstract»

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  • Higher-order spectrum factorization with applications

    Publication Year: 1989, Page(s):2178 - 2181 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The authors address the problem of modeling a given higher order spectrum as that of the output of a linear time-invariant system driven by a higher order white random signal. This can be posed as a higher order spectrum factorization problem. The authors provide a theorem concerning the existence of such a factorization. A fast algorithm for efficient implementation of the factorization, if it ex... View full abstract»

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  • A medical axis transform algorithm for compression and vectorization of document images

    Publication Year: 1989, Page(s):1850 - 1853 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    It is proposed that the medial axis transformation (MAT), being an invertible transformation, has value in lossless data compression, and, since the MAT conveys the line structure of an image, that it is also useful for vector conversion. To this end, some properties of the MAT are established and then exploited to devise a specialized chain-code representation. This MAT-based chain-code language ... View full abstract»

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  • Using auxiliary signal to remove the SPR condition from recursive adaptive algorithms

    Publication Year: 1989, Page(s):1051 - 1054 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    The use of adaptive recursive filters and output error identification techniques has been severely restricted by the need to satisfy the so-called SPR (strictly positive real) condition. A method to remove the SPR condition by using an auxiliary signal is demonstrated. It is based on the HARF (hyperstable adaptive recursive filter). By choosing a proper auxiliary sequence, the adaptive algorithm c... View full abstract»

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  • An interpolative spatial domain technique for coding image sequences

    Publication Year: 1989, Page(s):1917 - 1920 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The authors identify the main mechanism through which bits are consumed in the RBN (recursive binary nesting) coding scheme and determine ways in which this can be reduced. To this end, various forms of local motion-compensation are implemented and described, but the results are found to be disappointing. Different quantizers are then considered, but again the improvements were minimal. A scaled q... View full abstract»

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  • Analysis of finite precision effects on an OBE algorithm

    Publication Year: 1989, Page(s):853 - 856 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    An analysis of error propagation in the OBE (optimal bounding ellipsoid) algorithm shows that roundoff errors made at some instant of time would result in bounded errors in the subsequent estimates. A modified forgetting factor determination formula that is less sensitive to rounding errors is proposed. It is shown through simulations that the OBE algorithm performs better than the RLS (recursive ... View full abstract»

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  • Statistical performance comparison of MUSIC in element-space and beam-space

    Publication Year: 1989, Page(s):2124 - 2127 vol.4
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Statistics of the spatial null spectra, generated from reduced-dimension beam-space (RDBS) data and MUSIC, are investigated and compared with those from element-space MUSIC. The authors consider analytically the estimated null-spectra mean and variance, particularly at critical points that determine spectral resolvability. Approximate expressions for resolution thresholds for element-space and RDB... View full abstract»

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  • Generic ASIC architecture and synthesis scheme for DSP

    Publication Year: 1989, Page(s):2413 - 2416 vol.4
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A description is given of the architectural ideas underlying a high-level IC design tool under development, which is intended specifically for digital signal processor (DSP) users. Although by necessity more restrictive than a general-purpose ASIC design system, this tool is able to support the rapid specification and verification of dedicated DSP processors of arbitrary throughput, accuracy, and ... View full abstract»

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  • Analysis of subspace fitting based methods for sensor array processing

    Publication Year: 1989, Page(s):2807 - 2810 vol.4
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    The problem of estimating signal parameters from sensor array measurements is addressed. A general multidimensional signal subspace method, called the weighted subspace fitting (WSF) method, is proposed. The relationship of WSF to other signal subspace methods as well as the relation to the deterministic maximum-likelihood (ML) method is discussed. The asymptotic properties of WSF are presented fo... View full abstract»

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  • The periodogram envelope in parametric and non-parametric spectral estimation

    Publication Year: 1989, Page(s):2174 - 2177 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    The role of the periodogram envelope as a nonparametric approach for spectral estimation and its potential in parametric spectral estimation using variational approaches are examined. The spectral envelope, or its prior estimate the periodogram envelope, represents a very good candidate for starting any approach to spectral estimation due to its smooth character, its robustness against flat noise ... View full abstract»

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  • Consonant recognition by modular construction of large phonemic time-delay neural networks

    Publication Year: 1989, Page(s):112 - 115 vol.1
    Cited by:  Papers (65)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    It is shown that neural networks for speech recognition can be constructed in a modular fashion by exploiting the hidden structure of previously trained phonetic subcategory networks. The performance of resulting larger phonetic nets was found to be as good as the performance of the subcomponent nets by themselves. This approach avoids the excessive learning times that would be necessary to train ... View full abstract»

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  • Digital representation and storage of high quality color images by anisotropic enhancement and subsampling

    Publication Year: 1989, Page(s):1846 - 1849 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    The application of novel anisotropic filter design techniques based on properties of human vision to the processing of luminance and chrominance components of color images is considered. Applied independently, these anisotropic filters can be used for the sequential digital representation of images by subsampling. By using them with two-dimensional quadrature modulation of chrominance signals, the... View full abstract»

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  • Uniqueness of MSOE estimates in IIR adaptive filtering; a search for necessary conditions

    Publication Year: 1989, Page(s):1047 - 1050 vol.2
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    In adaptive IIR (infinite impulse response) filtering, gradient search techniques minimize the mean-square output error (MSOE). The uniqueness of the minimum MSOE estimate for exactly matching adaptive filters is a necessary condition for global convergence of these algorithms. Although the existence of stable degenerated solutions is sufficient for the existence of local minima, it is shown by an... View full abstract»

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  • Image sequence coding at 64 kbps using vector quantization and block matching

    Publication Year: 1989, Page(s):1913 - 1916 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    The authors propose algorithms for compressing monochrome and color image sequences depicting videotelephone/videoconference scenery down to 64 kb/s. This rate is of interest as it is one of the primary rates within the ISDN (integrated services digital network) network architecture. Emphasis is given to synchronous transmission strategies in which successive frames are updated at a fixed bit rate... View full abstract»

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  • On the use of the information on individual speaker's position in the parameter space for speaker recognition

    Publication Year: 1989, Page(s):516 - 519 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    The author defines the distinctiveness of an utterance as the distance from a typical utterance. The use of this information has been found to allow speaker recognition to be performed with speaker-dependent accuracy. A significant performance difference that depends on the magnitude of the distinctiveness has been found both in speaker identification and in speaker verification View full abstract»

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