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Communications, Computers and Signal Processing, 1991., IEEE Pacific Rim Conference on

Date 9-10 May 1991

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Displaying Results 1 - 25 of 204
  • On placement of the ACR-NEMA bus in picture archiving and communications systems

    Publication Year: 1991, Page(s):561 - 564 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (389 KB)

    The ACR-NEMA standard (1985) allows different medical devices to communicate compatibly in a picture archiving and communication system (PACS) environment. The authors evaluate the performance of PACSs incorporating the ACR-NEMA standard. The ACR-NEMA standard requires that the ACR-NEMA bus be placed between any medical device and a network interface unit. The authors propose the removal of the AC... View full abstract»

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  • IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (Cat. No.91CH2954-6)

    Publication Year: 1991
    Request permission for commercial reuse | PDF file iconPDF (155 KB)
    Freely Available from IEEE
  • Adaptive multidimensional signal processing for ocean surveillance

    Publication Year: 1991, Page(s):1 - 4 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A discussion is presented of adaptivity and multidimensionality in the context of ocean surveillance using a surface-based radar. This environment is used to emphasize the basic notions of complexity and efficiency and the signal-processing roles of chaotic modeling, neural networks, Doppler-polarization (multidimensional) processing, and wavelet-inspired time-frequency analysis. The discussion is... View full abstract»

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  • Multifunction workstation integrated voice/data/graphics for the ISDN environment

    Publication Year: 1991, Page(s):441 - 444 vol.2
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The authors focus on the development of a multifunction workstation for the ISDN environment, integrating voice, data, and graphics information. The configuration and services of the workstation are introduced. The multimedia protocol and multimedia synchronization are discussed, and the implementation of the ISDN communication control unit (CCU) board and the CCU interface to the host computer ar... View full abstract»

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  • A hierarchical bandwidth management architecture for solving bandwidth congestion in the ATM/B-ISDN user-network interface

    Publication Year: 1991, Page(s):437 - 440 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    The authors describe a methodological framework for the analysis of network congestion in a generic asynchronous transfer mode (ATM)/broadband-ISDN (B-ISDN) network. A three-level hierarchical network congestion management architecture is proposed; with a higher hierarchical level corresponding to a slower congestion control frequency. By dividing the congestion problem into scopes according to th... View full abstract»

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  • Characterization of the workspace for planar robot manipulators

    Publication Year: 1991, Page(s):158 - 161 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    The complete description of the workspace of a two-degree-of-freedom planar robot manipulator is derived. The derivation takes into account the effects of kinematic parameters on the workspace. The derivation is based on a method using polynomial discriminants of the kinematic equations and expresses the workspace as a set of boundary curves that are convenient to use in a number of applications View full abstract»

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  • Processing overhead of the RISC state-swapping operation in the ISDN software processing

    Publication Year: 1991, Page(s):433 - 436 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    The processing overhead of the reduced instruction set computer (RISC) state-swapping operation is evaluated in the ISDN software environment. A model for the ISDN application tasks is introduced to simulate the processing of ISDN user-network interface protocols. A simple approach is developed to arrive at an estimate for this overhead. The measurement of the processing was calculated for two ISD... View full abstract»

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  • Design considerations for acoustic ring arrays

    Publication Year: 1991, Page(s):132 - 137 vol.1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    Several practical aspects of the implementation of an array of ring radiators are investigated. Specifically, the sensitivity of the radiation pattern to finite tolerances associated with array implementation is addressed. The obtained results are presented in a tabular form convenient for a designer. The proposed configuration can be readily implemented as a receiving array using piezoelectric fi... View full abstract»

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  • Weak signal detection using suboptimum quantization

    Publication Year: 1991, Page(s):154 - 157 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    A suboptimum quantization-detection system in which the locally optimum nonlinearity is replaced by a uniform quantizer and a coder for the uniform quantizer output levels is proposed. The proposed detection system does not require iterations to obtain the parameters of the quantizer and is easily implementable in practice. A design procedure is developed for the suboptimum quantizer, and the para... View full abstract»

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  • A 3-D nonlinear recursive digital filter for video image processing

    Publication Year: 1991, Page(s):494 - 497 vol.2
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    The authors introduce a recursive 3-D nonlinear digital filter that is capable of performing noise suppression without degrading important image information such as edges in space or time. It also has the property of unnoticeable bandwidth reduction immediately after a scene change, which makes the filter an attractive preprocessor to many interframe compression algorithms. The filter consists of ... View full abstract»

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  • Priority queueing strategies for traffic control at an ATM integrated broadband switching system

    Publication Year: 1991, Page(s):429 - 432 vol.2
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    Discusses the problem of furnishing an asynchronous transfer mode (ATM) based broadband integrated service digital network (B-ISDN) with two bearer services supporting different grades of transfer quality. This is achieved by dynamically allocating network resources (bandwidth and buffers) using priority classes. The focus is on priority bandwidth and buffer management in the ATM communications no... View full abstract»

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  • 3-D digital filter design using symmetrical decomposition technique

    Publication Year: 1991, Page(s):795 - 798 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The authors explore ways of decomposing a 3D response into a number of components and designing a 3D filter by designing each component individually. The authors first list the types of 3D symmetries and antisymmetries that can be present in 3D filter responses. The types of symmetries studied are spatial centro symmetry, single, double, and triple planar quadrantal, diagonal, four-fold rotational... View full abstract»

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  • Teleoperator task performance evaluation using 3-D video

    Publication Year: 1991, Page(s):615 - 618 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    The authors discuss research investigating the utility of three-dimensional stereo imaging for use in the remote monitoring and control of a robot workcell. These first experiments form the preliminary studies for a long-term research program designed to explore the interaction between operators and telerobots. Results from a set of experimental trials using 12 human subjects are included, verifyi... View full abstract»

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  • Techniques for objectively measuring motion distortion in video teleconferencing systems

    Publication Year: 1991, Page(s):352 - 355 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    A description is presented of three different techniques for measuring motion distortion in video teleconferencing and videophone (VTC/VP) systems: temporal frequency response, scene cut response, and transmitted frame rate. All three techniques satisfy the two basic requisites for a measurement procedure to be practical. First, the measurements are performed using only the output processed pictur... View full abstract»

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  • On state space representations of LBR and BR matrices for N-D discrete-time systems and time-delay systems

    Publication Year: 1991, Page(s):400 - 405 vol.1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    Sufficient conditions for state space representation of structurally stable N-D bounded real (BR) and lossless bounded real matrices (LBR matrices) are derived in the case of discrete-time systems and noncommensurate time-delay systems. Circuit theoretic interpretations for these conditions are given. The similarity of algebraically equivalent minimal realizations of the 2D LBR transfer f... View full abstract»

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  • Detection of the number of signals in the presence of noise with an unknown, banded structured covariance matrix

    Publication Year: 1991, Page(s):128 - 131 vol.1
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    Based on the fact that a noise is usually correlated over a limited spatial range, a detection scheme employing two spatially separated arrays is proposed. To extend this concept to the detection problem is quite natural. The problem is how to find a theoretically solid, functionally robust algorithm to process the array outputs. A canonical correlation is introduced to solve the problem, and a sa... View full abstract»

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  • A fuzzy set theoretic approach to signal detection

    Publication Year: 1991, Page(s):150 - 153 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    A reformulation of the generalized Neyman-Pearson lemma is attempted using the fuzzy set theory. Based on the result, a locally optimum (or locally most powerful) fuzzy test is defined and the locally optimum fuzzy test function is derived. As a practical application of the locally optimum fuzzy test, detection of weak deterministic signals corrupted by purely additive noise, which is an important... View full abstract»

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  • A comparison of one- and two-dimensional vector quantization of images

    Publication Year: 1991, Page(s):490 - 493 vol.2
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The authors discuss results for compressing images using both 2-D and 1-D vector quantization (VQ). Typically, an image is scanned in a line-by-line basis. The 2-D technique is based on a window that spans several adjacent lines. The 1-D technique is based on a window that spans a portion of a single line. The advantages of the 1-D scheme are considerable reduction in implementation complexity, re... View full abstract»

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  • Fast division in residue arithmetic

    Publication Year: 1991, Page(s):696 - 699 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    A residue division technique is presented. The technique is based on the use of a number system termed the radix-based residue number system (RNS) and, associated with it, the homogeneous mixed-radix number system (HMRS). The quotient is obtained as the sum of the rounded partial quotients of the HMRS weights and the divisor. The division is fast, noniterative, and implementable in a parallel look... View full abstract»

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  • Noncoherent trellis coded π/4-shift DQAM with diversity reception for future digital mobile/cellular communication systems

    Publication Year: 1991, Page(s):425 - 428 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The authors derive the optimal sequential noncoherent diversity receiver for trellis coded π/4-shift differentially encoded quadrature amplitude modulated (π/4shift DQAM) signals received over l (1⩽l⩽Λ) independent channels. Each of these channels corrupts the transmitted signal by a mixture of additive white Gaussian noise (AWGN) and flat fading. To reduce t... View full abstract»

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  • The development of an 8 kbps GMSK-like modem for Mobitex

    Publication Year: 1991, Page(s):791 - 794 vol.2
    Cited by:  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    The 1200/8000 b/s GMSK-like modem utilizing a digital signal processor (DSP) and the required support circuitry is being developed. The modem functions are implemented using a DSP-based assembler. Both data transmission speeds are accommodated and are user selectable depending upon the position of a hardware selection switch (prototype only). The design eliminates the need for external DSP memory,... View full abstract»

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  • Binarisation of various images by detecting local thresholds with a validation test

    Publication Year: 1991, Page(s):611 - 614 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    The threshold method is one of the most important stages in the image pattern recognition chain when the object to be modeled does not contain texture. The authors present an efficient threshold method for a variety of images. It is based on the automatic detection of the different local thresholds of the image, taking into consideration the local properties of each histogram (unimodal, bimodal, o... View full abstract»

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  • The need for video standards in DoD

    Publication Year: 1991, Page(s):349 - 351 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    The technical areas currently limiting video teleconferencing's (VTC's) effectiveness for meeting essential US Department of Defence (DoD) needs are identified, and the DoD response being taken to each is described. Special emphasis is given to a discussion of performance issues from a user's perspective. Suggestions are offered for resolving these issues within the framework of current commercial... View full abstract»

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  • On the minimization of system matrix for two-dimensional digital filters

    Publication Year: 1991, Page(s):396 - 399 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    An optimization algorithm is developed to minimize the 2-norm of the transformed system matrix for a 2D state-space digital filter. The method is actually a two-loop Fletcher-Reeves-type method, where the line search is carried out using a combination of golden section ratio search and the method of false position. In general, the proposed method can be used to solve nonquadratic optimization prob... View full abstract»

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  • A new technique for low-angle radar tracking

    Publication Year: 1991, Page(s):124 - 127 vol.1
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    A new technique is described which is based on nonlinear modeling and which is designed expressly for radar tracking of low-angle targets in naval environments. Results obtained from both simulation and experimental data are presented to show that the technique is effective and robust in terms of providing accurate estimates of target heights View full abstract»

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