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Circuits and Systems, 1991. Conference Proceedings, China., 1991 International Conference on

Date 16-17 June 1991

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Displaying Results 1 - 25 of 274
  • China 1991 International Conference on Circuits and Systems. Conference Proceedings (Cat. No.91TH0387-1)

    Publication Year: 1991
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    Freely Available from IEEE
  • Analysis of spherical-wraparound microstrip antennas by spectral domain method

    Publication Year: 1991, Page(s):392 - 394 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (261 KB)

    The far field radiation patterns of a wraparound microstrip antenna mounted on a sphere are studied theoretically. The radiator is replaced by an assumed surface current distribution. The effects of the dielectric layer and the metallic sphere are rigorously taken into account by a spectral domain Green's function formulation. Some practical results with different dielectric substrate thickness an... View full abstract»

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  • The improvement of crucial circuit and systems for HF digital communication-modern carrier tracker and bit synchronizer

    Publication Year: 1991, Page(s):403 - 406 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    New ideas and methods for improving the carrier tracker and bit synchronizer are discussed. Their implementation in a serial type HF modem is investigated View full abstract»

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  • The design of dielectric resonator VCO

    Publication Year: 1991, Page(s):399 - 402 vol.1
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    Two design methods are presented which result in a simple, low-cost and highly stable L-band VCO. One method uses microwave transistors and a high dielectric constant microstrip line which couples with DR. The frequency tuning range of the oscillator is more than 0.5% using this method. The other design method is based on the C-band Self-Oscillation Mixer (SOM) since the L-band DR is too large to ... View full abstract»

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  • Nonlinear analysis of phase-lock loop in coherent communication system

    Publication Year: 1991, Page(s):395 - 398 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    A phase-lock loop is essentially an optimum nonlinear phase estimator, so that it can reduce the noise to a minimum, and recover the signal. Input noise can cause output phase trembling in the loop and affect its synchronization and tracking properties. It can even cause cycle skips. According to the analysis and simulation results, the probability density of random phase is the approximately Gaus... View full abstract»

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  • A new transmission line and its analysis

    Publication Year: 1991, Page(s):956 - 959 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    The author introduces a new transmission line realized by a coaxial line that contains the three concentric cylindrical conductors and the two intermediate dielectric media. Using simple analysis one can predict that this transmission line has two propagation constants, four characteristic impedances and four equations governing the distribution of the longitudinal currents and the two transverse ... View full abstract»

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  • Robust edge detector based on morphological filters

    Publication Year: 1991, Page(s):332 - 335 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    A new edge detector based on alternating sequential filters (ASF) is presented and analyzed. The performance of ASF edge detector in the presence of noise is evaluated and is compared to the performance of well established morphological edge detectors. Experimental results show that ASF edge detector performs better than blurminimization edge detector and ATM edge detector View full abstract»

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  • On cepstrum approach to sequential image matching

    Publication Year: 1991, Page(s):797 - 800 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    Sequential image matching is a basic problem in image analysis and computer vision. Among the existing methods, there are intensity-based approaches and feature-based approaches, however, there are still some problems with the existing methods. It is hoped that the cepstrum method provides a robust and accurate way to match sequential images instead of correlation algorithms. In the present paper,... View full abstract»

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  • Noisy image moving point target recognition by using neural network

    Publication Year: 1991, Page(s):290 - 293 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    In this paper, the problem of noisy image moving point target recognition is discussed. A recognition method is proposed. This method is composed of the three processes in cascade which are: process A, preprocessing of the noisy image moving point target sequence; process B, choice and extraction of features; and process C, classification of the extracted features by using a second-order neural ne... View full abstract»

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  • A generalized complex matrix and its applications in nonlinear circuit analyses

    Publication Year: 1991, Page(s):744 - 745 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (108 KB)

    The author introduces a generalized complex matrix to represent (in the frequency domain) the steady-state variables of a nonlinear circuit with n-frequency large-signal excitation. In terms of this generalized complex matrix and a generalized complex matrix convolution operator defined in this paper, the spectral balance equation of the nonlinear circuit is a system of complex variable nonlinear ... View full abstract»

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  • An approach to the design of IIR Hilbert transformers

    Publication Year: 1991, Page(s):613 - 616 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    An approach to the design of the causal IIR Hilbert transformer is presented. When the `care' band is symmetric about the frequency, F/4-one-fourth of the sampling frequency-a Hilbert transformer can be easily derived from designing a bireciprocal prototype lowpass filter; in the non-symmetrical case, the optimum frequencies are obtained directly by making use of an optimization method and the coe... View full abstract»

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  • Multi-valued full-function flip-flops

    Publication Year: 1991, Page(s):928 - 931 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    The author discusses multi-valued full-function flip-flops. In particular he discusses various functions of symmetrical ternary flip-flops, and indicates that full-function p.q.r. flip-flops have 27 kinds of function transformations View full abstract»

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  • Active integrated radiator for microwave sensing system

    Publication Year: 1991, Page(s):952 - 955 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    The design and test of an active integrated radiator (AIR) which is suitable for use in phased arrays and spatial power combining are described. The circuit is constructed by using a removed-lateral-shell dielectric resonator (DR) to serve as a radiator and a resonator, with a BJT transistor as the active device. The high-Q DR is small in size and acts as a frequency selective element in the activ... View full abstract»

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  • Load-pull measurements using characterised matching network and variable load [UHF bipolar transistors]

    Publication Year: 1991, Page(s):388 - 391 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    Load-pull measurements are traditionally performed using stub tuners which can be unreliable and difficult to use. The authors present a method which minimises the use of stub tuners, and by using characterised components reduces the measurement time considerably View full abstract»

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  • Image correspondence based on region hierarchy

    Publication Year: 1991, Page(s):328 - 331 vol.1
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    Finding correspondences of pictorial features is a basic problem in many areas, like map matching, looking up image data, or stereo vision. Region-based correspondence techniques seem to be effective for identifying the corresponding features, as regions are usually fewer than other image features and provide additional information such as color, area, and adjacency. This paper proposes to give ea... View full abstract»

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  • Weighted FIR median hybrid filters for image processing

    Publication Year: 1991, Page(s):793 - 796 vol.2
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Based on a recent study on the optimal FIR stack hybrid (FSH) filtering under the mean absolute error criterion, weighted FIR median hybrid (WFMH) filters are proposed in this paper. These filters do not need any complicated design procedure, as do the optimal FSH filters, but include many FSH filters commonly used in practice. Some properties of WFMH filters are studied and the applications of WF... View full abstract»

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  • AISCE: a layout synthesis system for ASIC design

    Publication Year: 1991, Page(s):419 - 422 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    This paper describes a layout synthesis system called AISCE. The system accepts structural or logic hardware design specification and creates a physical layout of the integrated circuit automatically. AISCE contains several parts: schematic capture system, netlist compiler, module generators for data and control paths, tools for floorplanning, placement and routing, simulators and verifiers, etc. ... View full abstract»

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  • Estimating two-dimensional angles of arrival by neural networks

    Publication Year: 1991, Page(s):286 - 289 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    A two-layer neural network to estimate two-dimensional (2-D) angles of arrival (AOA) for multiple narrowband radiating sources is proposed in this paper. To avoid performing a 2-D search, two one-dimensional (1-D) neural estimators are applied in the first layer to perform 1-D searches using rows and columns of the rectangular array. To match the data obtained, a 2-D verification is then carried o... View full abstract»

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  • An approach to improve the robustness of estimating 3-D motion parameters from monocular and binocular image sequences

    Publication Year: 1991, Page(s):571 - 574 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    On the basis of the Cayley transform, this paper proposes a linear algorithm for determining 3-D motion parameters of a rigid body in monocular and binocular cases. Since the computation for rotation parameters is simplified from nine variables to three variables in the algorithm, the complexity of the computation is reduced so that the reliability and the stability are improved. Simulation experi... View full abstract»

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  • Connective stability of neural networks

    Publication Year: 1991, Page(s):271 - 274 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    In this paper the nonlinear dynamics and connective stabilities of neural network dynamical systems (which include delay-time) under structural perturbations are studied by differential inequalities and vector Lyapunov functions. The criteria of uniformly connective stability of neural network dynamical systems are established View full abstract»

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  • Improved analysis of the nonlinear distortion performance of an N-level analog multiplier

    Publication Year: 1991, Page(s):740 - 743 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    The author discusses the nonlinear distortion performance of an N-port analog multiplier under large signal conditions. Analytical expressions are obtained for the output up and down-converted frequencies in terms of the ordinary Bessel functions View full abstract»

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  • Holo-spectrogram and multi-dimensional encoding display

    Publication Year: 1991, Page(s):556 - 559 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The theory and method of the sound holo-spectrogram are presented. An experimental system is developed, which is based on a multi-dimensional encoding display technique. The principle of the multi-dimensional encoding display is given, and the choice of encoding domain is discussed. The display maintains magnitude-greyness modulation in the conventional sound spectrogram, retains all signal inform... View full abstract»

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  • Modeling and simulation of high frequency effects of a separately excited DC motor

    Publication Year: 1991, Page(s):192 - 196 vol.1
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    The frequency response of a DC motor armature winding is measured up to 10MHz. It is found that, at high frequencies the winding stops behaving like a complex RL circuit. The impedance magnitude drops sharply and the phase delay reduces. The equivalent circuit of the winding is modeled by lumped circuit impedance obtained by the curve fitting method using the software package MATLAB. Such an exten... View full abstract»

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  • 8 Kb/s trellis speech coding with and without prediction

    Publication Year: 1991, Page(s):33 - 36 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The basic principle of trellis source coding is introduced and the design method for trellis source coding system is described, with an emphasis on the design of the trellis codebook using a training sequence. Speech is used as the source, and the computer simulation results show that trellis speech coding can reach fairly good performance at the bit rate of 8 kb/s View full abstract»

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  • Realization of 2-dimensional (2-D) leapfrog digital filters

    Publication Year: 1991, Page(s):609 - 612 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    Describes the implementation of the 2-D digital filters. The realizations of computer programming software and digital hardware is given. Because the 2-D digital filters have excellent low sensitivity and stability for nonlinearities, the realizations of the filters have practical importance View full abstract»

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