Proceedings of the IEEE

Issue 5 • May 1974

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Displaying Results 1 - 25 of 26
  • [Front cover and table of contents]

    Publication Year: 1974, Page(s): c1
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    Freely Available from IEEE
  • Scanning the issue

    Publication Year: 1974, Page(s): 547
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    Freely Available from IEEE
  • Dichotomy and stability by frequency-domain methods

    Publication Year: 1974, Page(s):548 - 562
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1282 KB)

    In the last two decades, the frequency-domain criteria of stability have continuously progressed, overcoming previous limitations. In quest of a more complete meaning of these criteria, this paper shows that (if one renounces the auxiliary assumptions which were required in the past) they imply a property of conditional stability (or dichotomy) for a special type of relations. When applied to conv... View full abstract»

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  • A tsunami warning system using an ionospheric technique

    Publication Year: 1974, Page(s):563 - 577
    Cited by:  Papers (21)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    Earthquakes generate Rayleigh waves which travel along the surface of the earth about 20 times faster than the potentially destructive tsunami (if one is also generated) and reach distant points several hours before the tsunami. The Rayleigh wave excites an upward-propagating acoustic wave which, because of the exponential decrease in air density with height, increases to a large amplitude at iono... View full abstract»

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  • Force on current coils moving over a conducting sheet with application to magnetic levitation

    Publication Year: 1974, Page(s):567 - 577
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (867 KB)

    The use of Fourier-transform techniques provides exact integral expressions for the forces on polygonal dc current coils moving over a conducting sheet. These expressions are applied to investigate magnetic levitation of proposed high-speed transportation. Extensive numerical data have been analyzed to determine the performance dependence of the system parameters such as velocity, coil shape, arra... View full abstract»

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  • Properties of solitary waves as observed on a nonlinear dispersive transmission line

    Publication Year: 1974, Page(s):578 - 581
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2824 KB)

    Several properties of solitary waves that were measured on an easily constructed transmission line of very modest size (50 sections ∼1-m length) are described. Among the properties observed are their generation by a pulse or a sine wave, the recurrence phenomena, and the collision of two solitary waves. View full abstract»

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  • Practical surface acoustic wave devices

    Publication Year: 1974, Page(s):582 - 611
    Cited by:  Papers (20)  |  Patents (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (8597 KB)

    A tutorial discussion is presented on selected surface acoustic wave (SAW) devices for the use of engineers and electronic systems designers. Currently practical components for use in radar systems, communications systems, and as frequency domain filters are described. Emphasis is placed on nondispersive and dispersive delay lines, devices for generating and detecting various radar waveforms, devi... View full abstract»

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  • Digital coding of speech waveforms: PCM, DPCM, and DM quantizers

    Publication Year: 1974, Page(s):611 - 632
    Cited by:  Papers (174)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2694 KB)

    A study is presented on the digital coding of speech by means of a straightforward approximation of the time waveform. In particular, the closely related discrete-time discrete-amplitude signal representations that are rather well known as pulse-code modulation (PCM), differential pulse-code modulation (DPCM), and delta modulation (DM) are discussed. Speech is recognized as a nonstationary signal,... View full abstract»

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  • Surface resistance of single-crystal copper in the millimeter-wave region at room temperature

    Publication Year: 1974, Page(s):635 - 636
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    Measurements of the surface resistance of plane surfaces of single-crystal copper were carried out at 35 GHz. They indicate the existence of an anomalous skin effect at room temperature. The surfaces were prepared in stress-free processes, annealed, and manipulated in purified hydrogen and argon. View full abstract»

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  • A matrix method for continued fraction inversion

    Publication Year: 1974, Page(s):636 - 637
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    Previously used methods for converting a continued fraction function into a rational transfer function have been restricted to a special kind of continued fraction. This letter presents a method for inverting a general fraction; each partial quotient including the remainder could be a polynomial of s or s-1or both. View full abstract»

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  • On the construction of Gaussian quadrature rules for inverting the Laplace transform

    Publication Year: 1974, Page(s):637 - 638
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    Some properties of a set of orthogonal polynomials that play a key role in the numerical inversion of the Laplace transform are emphasized. These properties are exploited in showing that the inversion can be obtained by means of the eigenvalues and first component of the eigenvectors of a tridiagonal matrix related to the polynomials. View full abstract»

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  • A relationship between the Laplace, Poisson, and Hilbert (Stieltjes) transforms

    Publication Year: 1974, Page(s):638 - 639
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    The Poisson transform of the one-sided Laplace transform of a causal function is shown to be related to a one-sided Hilbert transform of the same function. Corollaries are indicated and applications are pointed out. View full abstract»

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  • High-speed tunnel-diode comparator

    Publication Year: 1974, Page(s):639 - 640
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (513 KB)

    A high-speed comparator consisting of a tunnel diode and a balanced four-transistor isolating amplifier is proposed. A low-frequency sensitivity of better than 10 mV and a hysteresis of approximately 300 mV were obtained. A maximum operating frequency in excess of 800 MHz was achieved. View full abstract»

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  • New quartz multivibrator

    Publication Year: 1974, Page(s):640 - 641
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    A new quartz multivibrator having a frequency stability better than 0.0005 percent between 3 and 12-V supply voltage is described. The temperature variations influence the multivibrator frequency as claimed for the crystal itself--the influence of the circuit is negligible. View full abstract»

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  • Efficiency versus doping profile in GaAs read-type IMPATT diodes

    Publication Year: 1974, Page(s):641 - 643
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (311 KB)

    The influence of doping profile on the efficiency of GaAs Read-type IMPATT diodes has been studied experimentally. A diode with low breakdown voltage, or a diode with a low bias field in the drift region, gave the highest efficiency. The mechanism will be discussed, estimating the restriction of RF voltage amplitude and the change of phase relation between RF current and voltage. View full abstract»

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  • Hologram conversion by computer

    Publication Year: 1974, Page(s):643 - 644
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (779 KB)

    A technique of converting Fresnel-tranform holograms into Fourier-transform holograms by computer is discussed. A sound-wave hologram is processed with 64×64 sampling points and images are reconstructed optically from this processed binary hologram in the Fourier-transform plane, that is, a focal plane of a lens. View full abstract»

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  • The grating guide—A component for integrated optics

    Publication Year: 1974, Page(s):644 - 645
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    A plane-wave theory for the integrated optics grating guide is presented. The characteristics of the guide are described using the wall reflection coefficient. Calculations are made of the attenuation, minimum-bend radius, and field distribution. Some methods of realizing the grating guide are proposed. View full abstract»

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  • Performance of an ideal dynamic tracking filter

    Publication Year: 1974, Page(s):645 - 646
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    An expression is derived for the minimum bandwidth which can be used for the dynamic tracking filter and a prediction is made of the maximum threshold extension that this bandwidth will allow. View full abstract»

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  • A general modified universal logic module

    Publication Year: 1974, Page(s):646 - 648
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (298 KB)

    The concept of building an n-variable universal logic module (ULM-n) is considered, based on a single building block, unlike that of Banks and Majithia, who suggested two building blocks, namely, ULM-2 and ULM-3. The input control functions have been kept the same, namely, 2-bit binary codes. This basic building block is then used for the synthesis of switching functions. View full abstract»

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  • Dielectric response function of breakdown plasma in silicon-controlled rectifiers

    Publication Year: 1974, Page(s):648 - 649
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (225 KB)

    The real and imaginary parts of the dielectric constant of the plasma in silicon-controlled rectifier was studied as functions of frequency from 0.3 to 30 MHz for different injection levels of the current. The relaxation time was estimated to vary from 40 to 25 ns from lower injection levels to higher injection levels. The results also exhibit a nonlinear dependence of damping constant and plasma ... View full abstract»

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  • Observation of externally controlled mode coupling in optical waveguides

    Publication Year: 1974, Page(s):649 - 650
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (219 KB)

    Externally controlled mode coupling was observed in a 0.7-km optical waveguide fiber resulting in a significant pulse narrowing. The method of mode coupling generation requires that care be exercised in any mode coupling measurement. Observations on a 3-km waveguide failed to show evidence of mode coupling, allowing the possibility of practical external control. View full abstract»

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  • A high-sensitivity real-time acoustic imaging system for biomedical diagnosis

    Publication Year: 1974, Page(s):650 - 651
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (275 KB)

    A real-time acoustic imaging system which is essentially the acoustic equivalent of the scanning electron-beam microscope is proposed. This system with piezoelectric detection is superior in theoretical performance to all the presently existing systems. A possible embodiment of such a system is described. View full abstract»

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  • A method of generating a random signal using operational amplifiers

    Publication Year: 1974, Page(s):651 - 653
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    An n-bit binary signal is considered to be a vector in an n-dimensional Euclid space. Based on the real number obtained by taking an inner product of the vectors in this space, a signal of normal density distribution will be generated. View full abstract»

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  • Slant Haar transform

    Publication Year: 1974, Page(s):653 - 654
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (205 KB)

    The slant Haar transform (SHT) is defined and related to ,the slant Walsh-Hadamard transform (SWHT). A fast algorithm for the SHT is presented and its computational complexity computed. In most applications, the SHT is faster and performs as well as the SWHT. View full abstract»

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  • Phase-plane analysis of phase-locked loops with rapidly varying phase error

    Publication Year: 1974, Page(s):654 - 656
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    Nonlinear behaviour of phase-locked loops with rapidly varying phase error is examined by using computer phase-plane analysis. The phase variation is modeled by a sinusoidal function. Threshold loop parameters are presented for both sinusoidal and sawtooth phase comparators. View full abstract»

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North Carolina State University