Proceedings of the IEEE

Issue 10 • Oct. 1968

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Displaying Results 1 - 25 of 48
  • [Front cover and table of contents]

    Publication Year: 1968, Page(s): c1
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    Freely Available from IEEE
  • Scanning the issue

    Publication Year: 1968, Page(s): 1643
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    Freely Available from IEEE
  • Sensitivity in optimal control systems

    Publication Year: 1968, Page(s):1644 - 1652
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (875 KB)

    Some recent developments in the area of sensitivity in optimal control systems are summarized. The several sensitivity definitions, analysis methods, and design techniques are placed in perspective. A selected list of references is included. View full abstract»

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  • Communication in time-frequency spread media using adaptive equalization

    Publication Year: 1968, Page(s):1653 - 1679
    Cited by:  Papers (21)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (4671 KB)

    In high-speed communication through a medium with time-frequency spread (such as in HF ionospheric, sonic underwater, and voice-quality telephone line transmission), the transmission speed and system errors are determined by an overall system variance (or equivalent noise). This overall variance comprises: 1) the intersymbol interference variance from time spread (or dispersion in the unit impulse... View full abstract»

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  • Cryoelectric hybrid system for very large random access memory

    Publication Year: 1968, Page(s):1679 - 1690
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2477 KB)

    The recent introduction of structured cells characterized by no cell-to-cell interaction, adequate sense signal, and array tolerance under repetitive worse-case disturb evaluation and coincident current operation, has made possible new systems approaches. A coincident current "hybrid" (word-bit) system utilizing room temperature decoders and structured loop cell arrays was designed to satisfy the ... View full abstract»

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  • Air cooled two- pole generators for gas turbine peaking service

    Publication Year: 1968, Page(s):1691 - 1695
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (483 KB)

    Considerations in the application and matching of two-pole cylindrical rotor generators to gas turbines for peaking service are discussed. Various criteria are reviewed, including generator thermal rating and limitations, gas turbine ratings, altitude factors, cyclic operating duty, rapid loading considerations, generator ventilation and air filtration, noise, steady-state and transient performanc... View full abstract»

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  • The linear random process

    Publication Year: 1968, Page(s):1696 - 1703
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (680 KB)

    A survey of the theory and applications of the class of random processes is presented. Topics discussed include the law of large numbers, covariance estimation, and the relationship of linear to normal processes. Various applications of the linear process to problems of communication theory are considered. These include prediction, signal extraction, and detection, using the linear process as a mo... View full abstract»

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  • Radiation models using discrete radiator ensembles

    Publication Year: 1968, Page(s):1704 - 1711
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (749 KB)

    In recent literature radiation emitted or reflected from a body or surface has been modeled as equivalent radiation from a collection of individual discrete radiators. This model has application to the analysis of forward and backscatter from rough surfaces, clutter and chaff models for radar, and cavity emissions at optical frequencies. In this paper we investigate radiation using a generalizatio... View full abstract»

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  • A natural law

    Publication Year: 1968, Page(s):1713 - 1715
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (274 KB)

    With credible assumptions, a general law is developed which appears to encompass all distributions arising from processes involving independent events. A number of familiar distributions may be obtained therefrom as well as many unusual distributions. The results suggest new methods for the analysis of experimental data and observations. View full abstract»

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  • Current controlled negative resistance in n-type gallium arsenide

    Publication Year: 1968, Page(s): 1715
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (349 KB)

    A current controlled negative differential resistance effect that can produce relaxation-type oscillations at frequencies in the 104- to 105-Hz range has been observed in n-type gallium arsenide. View full abstract»

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  • Viewing storage tubes based upon field-effect conductivity control

    Publication Year: 1968, Page(s):1716 - 1717
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (242 KB)

    A new type of halftone charge-controlled viewing storage tube has been demonstrated which uses the field-effect principle and requires no flood beam or storage mesh. Such tubes are potentially capable of high writing speeds and very long viewing times. In addition, selected portions of stored patterns may be erased and information can be displayed without being stored. View full abstract»

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  • A note on digital filter synthesis

    Publication Year: 1968, Page(s):1717 - 1718
    Cited by:  Papers (46)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (206 KB)

    It is commonly assumed that digital filters with both poles and zeros in the complex z-plane can be synthesized using only recursive techniques while filters with zeros alone can be synthesized by either direct convolution or via the discrete Fourier transform (DFT). In this letter it is shown that no such restrictions hold and that both types of filters (those with zeros alone or those with both ... View full abstract»

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  • Reducing distortion in controlled attenuators using FET

    Publication Year: 1968, Page(s):1718 - 1719
    Cited by:  Papers (6)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (178 KB)

    An analytical approximation of FET characteristics for positive and negative voltages is presented. The distortion in an application as a controlled attenator is calculated, and a method of reducing distortion by a factor of more than 50 is described. View full abstract»

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  • Electrooptic effect in CdTe at 23.35 and 27.95 microns

    Publication Year: 1968, Page(s):1719 - 1720
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (186 KB)

    The unlamped electrooptic coefficient r41of high-purity CdTe has been measured at 23.35 and 27.95 micros in the far infrared. The values obtained for n03r41are 9.4 × 10-11m/V at 23.35 µ and 8.1 × 10-11m/V at 27.95 µ. Using previously reported values for n0, the electrooptic coefficients are found to be... View full abstract»

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  • The topology of the mixed potential function

    Publication Year: 1968, Page(s):1721 - 1722
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (153 KB)

    The canonical form of the network equations based on the mixed potential function are developed and examined from a topological viewpoint. View full abstract»

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  • The design of an operational amplifier notch filter

    Publication Year: 1968, Page(s):1722 - 1723
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (150 KB)

    The operational amplifier equivalent of a hybrid transformer notch filter is presented together with the design equations. View full abstract»

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  • FM distortion: A modified first-order theory

    Publication Year: 1968, Page(s): 1723
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (88 KB)

    A new formula is given for the distortion of an FM signal produced by a linear network. It extends the first-order theory of Rice by including a modification due to Bedrosian and Rice. View full abstract»

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  • A two-port IMPATT diode traveling wave amplifier

    Publication Year: 1968, Page(s):1724 - 1725
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (501 KB)

    Traveling wave amplification has been obtained in an IMPATT diode fabricated in the form of a long, narrow strip and imbedded in a strip-line circuit. The results of an analysis of this device and experimental observation of gain and phase shift are reported. View full abstract»

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  • Comparison of statistical models for the purpose of designing an optimum predictor

    Publication Year: 1968, Page(s):1725 - 1727
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (233 KB)

    A comparison of two different statistical input models is made in order to decide upon which of these models the design of an optimum predictor should be based. Under certain circumstances, samples of typical data may be fitted equally well by two or more statistical input models. Since it is necessary to have a statistical model for the input before an optimal predictor can be designed, a method ... View full abstract»

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  • Large-signal transient effect in avalanche diodes

    Publication Year: 1968, Page(s):1727 - 1728
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (207 KB)

    A nonlinear transient effect in avalanche diodes is proposed. In this effect, carriers in a bunch sweep across the depletion region, ionizing as they go, and leaving behind an electric field substantially lower than the initial field, and too low to allow further ionization. View full abstract»

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  • Relationship between slope probability density function and the physical optics integral in rough surface scattering

    Publication Year: 1968, Page(s):1728 - 1729
    Cited by:  Papers (48)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (251 KB)

    The integral for the average scattered power from a rough surface obtained from physical optics is shown to be proportional to the joint probability density function for the surface slopes in the high-frequency limit. View full abstract»

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  • A troposcatter propagation experiment at 15.7 GHz over a 500 km path

    Publication Year: 1968, Page(s):1729 - 1731
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (419 KB)

    An experiment to study tropospheric structure through the use of high resolution antennas having a very small common volume is described. Measurements at 15.7 GHz over a 500 km path between Boston and Ottawa have been conducted, and signals as large as 25 dB above the receiver noise level have been obtained. View full abstract»

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  • Average digit error probability in decoding a linear block code

    Publication Year: 1968, Page(s):1731 - 1732
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (200 KB)

    An upper bound on the average digit error probability of a linear block code is given which is dependent only upon the minimum distance of the code. The tightness of this bound is also demonstrated, and an example is given where knowledge of the average digit error probability is important. View full abstract»

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  • Hysteresis effects in the slope calibration method for magnetometers

    Publication Year: 1968, Page(s):1733 - 1734
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (163 KB)

    The slope method for calibrating vibrating sample magnetometers requires spherical samples of high permeability such that µ + 2/µ - 1 ≈ 1 It is shown that the presence of a small remanence in the calibration spheres results in an effective permeability that is as great if not greater than the initial permeability often used in the above equation. This even higher permeability furth... View full abstract»

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  • Pontryagin's maximum principle aids transient stability: Bang-bang control of reactance

    Publication Year: 1968, Page(s):1734 - 1735
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (187 KB)

    Application of Pontryagin's maximum principle to the problem of restoring a power system to its steady-state operating point in minimum time after a transient disturbance is discussed. A new mode of control is presented. View full abstract»

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North Carolina State University