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Proceedings of the IEEE

Issue 8 • Date Aug. 1984

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Displaying Results 1 - 25 of 25
  • [Front cover and table of contents]

    Page(s): c1
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  • Scanning the issue

    Page(s): 995
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  • A study of a class of detection waveforms having nearly ideal range—Doppler ambiguity properties

    Page(s): 996 - 1009
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    A special class of permutation matrices is considered. It is shown that these matrices may be beneficially used to determine the frequency-time pattern of a uniform pulse train. Proper choice of burst waveform parameters is shown to result in a detection wave-form having range and Doppler resolution properties consistent with the overall signal duration and bandwidth. The range-Doppler sidelobe peaks are well-controlled so that the ideal "thumbtack" ambiguity function behavior is closely approximated by the synthesis procedure presented. View full abstract»

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  • The fast Hartley transform

    Page(s): 1010 - 1018
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    A fast algorithm has been worked out for performing the Discrete Hartley Transform (DHT) of a data sequence of N elements in a time proportional to Nlog2N. The Fast Hartley Transform (FHT) is as fast as or faster than the Fast Fourier Transform (FFT) and serves for all the uses such as spectral analysis, digital processing, and convolution to which the FFT is at present applied. A new timing diagram (stripe diagram) is presented to illustrate the overall dependence of running time on the subroutines composing one implementation; this mode of presentation supplements the simple counting of multiplies and adds. One may view the Fast Hartley procedure as a sequence of matrix operations on the data and thus as constituting a new factorization of the DFT matrix operator; this factorization is presented. The FHT computes convolutions and power spectra distinctly faster than the FFT. View full abstract»

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  • A review of opening switch technology for inductive energy storage

    Page(s): 1019 - 1040
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    A review of the state of the art in opening switches is presented. The general operating principles and present and potential future operating parameters for several switch categories are discussed. Among the switch categories described are: mechanical, solid state, vacuum arc, crossed field, fuse, explosive, plasma gun, superconducting, thermal, MHD instability, diffuse discharge, plasma erosion switches, and reflex triodes. View full abstract»

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  • A method of reducing disturbances in radio signaling by a system of frequency modulation

    Page(s): 1042 - 1062
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    A new method of reducing the effects of all kinds of disturbances is described. The transmitting and receiving arrangements of the system, which makes use of frequency modulation, are shown in detail. The theory of the process by which noise reduction is obtained is discussed and an account is given of the practical realization of it in transmissions during the past year from the National Broadcasting Company's experimental station on the Empire State Building in New York City to Westhampton, Long Island, and Haddonfield, New Jersey. Finally, methods of multiplexing and the results obtained in these tests are reported. View full abstract»

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  • Barrow on waveguide transmission

    Page(s): 1063
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    First Page of the Article
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  • Transmission of electromagnetic waves in hollow tubes of metal

    Page(s): 1064 - 1076
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    Electromagnetic energy may be transmitted through the inside of hollow tubes of metal, provided the frequency is greater than a certain critical value; this value is inversely proportional to the tube radius and to the dielectric coefficient for the tube interior. Calculations and measurements of the more important characteristics of this new kind of transmission system have been made, and the conditions for minimum attenuation obtained Terminal devices for connecting a hollow pipe system to a biconductor system and others, in the form of horns, for directly radiating radio waves, have been developed; these electromagnetic horns may also be fed with ordinary coaxial lines. Certain types of terminals act as sharply resonant hollow tube elements. Several independent communication channels may be established within a single pipe line by utilizing distinct types of waves for each channel in a unique kind of multiplex operation. A section of a hollow tube may be used as a high-pass filter. Although presupposing adequate technique for the generation and utilization of the shortest radio waves, this new system possesses several features, among which are a minimum dielectric loss, substantially perfect shielding, and a simplicity of structure. View full abstract»

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  • Wheeler on wide-band amplifiers

    Page(s): 1077
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    First Page of the Article
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  • Wide-band amplifiers for television

    Page(s): 1078 - 1086
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    The maximum uniform amplification that can be secured over a wide frequency band by means of a single vacuum tube is much greater than that of the usual simple circuits. It can be secured by either of two arrangements, one using an individual filter coupling each tube to the next, and the other using degenerative feedback in each stage to make the stage behave as a section of a confluent filter. In either case, the shunt capacitance on each side of each tube is included in an individual full-shunt arm of a band-pass or low-pass filter. One end of each interstage filter, or of each filter including one or more feedback stages, is extended to a dead-end termination with resistance approximately matching the image impedance. The other end is terminated at one of the tubes in a full-shunt arm, where the filter presents the maximum uniform impedance that can be built up across the tube capacitance. These concepts in terms of wave filters lead to practical wide-band circuits adapted to meet any given requirements. The following general formula is shown to express the maximum uniform amplification that can be secured in one tube: A = gm/πfw√CgCpin which A is the voltage ratio between input and output circuits of equal impedance, gmis the transconductance of the tube, Cgand Cpare the grid and plate capacitance of the tube, and fwis the width of the frequency band. View full abstract»

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  • Fields at the tip of an elliptic cone

    Page(s): 1089 - 1091
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    The field singularities near the tip of an elliptic cone are presented. We prove that the electric field singularity depends on the first even Dirichlet eigenvalue while the first Neumann is related to the magnetic field singularity. Some data on the eigenvalues are given. View full abstract»

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  • Bilinear transformation and minimal order

    Page(s): 1091 - 1092
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    It is shown that the minimal order of a multivariable transfer function remains invariant under the bilinear transformation. This property enables the extension of any technique for linear-order reduction of multivariable continuous-time systems to the discrete case. View full abstract»

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  • Sufficient conditions for instability of multidimensional discrete systems

    Page(s): 1092 - 1093
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    Some new simple sufficient conditions were presented for the multidimensional part of the stability test of discrete multidimensional causal systems. However, it is shown in this letter that these conditions also violate the one-dimensional part of the stability test. Hence, they are sufficient conditions for instability of the system. View full abstract»

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  • Explicit formulas for the weighting coefficients of maximally flat nonrecursive digital filters

    Page(s): 1092
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    An explicit formula is given for the weighting coefficients of maximally flat nonrecursive digital filters based on Miller's [1] design. A scheme is also presented for evaluating these coefficients with the minimum possible computation. View full abstract»

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  • On the relation between triangular matrix decomposition and linear interpolation

    Page(s): 1093 - 1094
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    The December 1983 letter by C. W. Therrien concerning the relation between triangular matrix decomposition and linear prediction is extended to include linear interpolation. View full abstract»

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  • An information-theoretic proof of Burg's maximum entropy spectrum

    Page(s): 1094 - 1096
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    It is known that the maximum entropy stationary Gaussian stochastic process, subject to a finite number of autocorrelation constraints, is the Gauss-Markov process of appropriate order. The associated spectrum is Burg's maximum entropy spectral density. We pose a somewhat broader entropy maximization problem, in which stationarity and normality are not assumed, and shift the burden of proof from the previous focus on the calculus of variations and time series techniques to a string of information-theoretic inequalities. This results in an elementary proof of greater generality. View full abstract»

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  • A digital tachometer for measurement of very low speeds

    Page(s): 1096
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    An induction-type digital tachometer in which the number of pulses is proportional to the speed is described. Even for very low speeds the number of pulses is high, making it very suitable for extremely low speed measurement. View full abstract»

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  • A solid-state controller for a wind-driven slip-ring induction generator

    Page(s): 1097 - 1099
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    This letter describes an electronic technique for controlling a system-connected induction generator with wind turbine drive to extract maximum available power at all rotational speeds in the usable wind speed range. View full abstract»

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  • CRC handbook of clinical engineering (vol. 1): General principles

    Page(s): 1100 - 1101
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  • Developing a data dictionary system

    Page(s): 1101 - 1102
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  • Microprocessor interfacing

    Page(s): 1101
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  • Integrated optics: Theory and technology (springer series in optical sciences, vol. 33)

    Page(s): 1102
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  • Book alert

    Page(s): 1102 - 1103
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  • [Back cover]

    Page(s): c4
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H. Joel Trussell
North Carolina State University