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IBM Journal of Research and Development

Issue 4 • Date July 1965

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Displaying Results 1 - 19 of 19
  • On Communications and Data Processing: A Foreword

    Publication Year: 1965, Page(s):226 - 227
    IEEE is not the copyright holder of this material | PDF file iconPDF (278 KB)
    Freely Available from IEEE
  • A New Approach to Time-Domain Equalization

    Publication Year: 1965, Page(s):228 - 232
    Cited by:  Papers (5)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (356 KB)

    A theoretical study is made of the time-domain equalization procedures for the correction of delay distortion in high-speed data transmission lines. In the first part of the paper the conditions that insure valid and effective use of a class of conventional time-domain equalizers are reviewed. In the second part of the paper, a new type of nonlinear time-domain equalizer is proposed, in which iter... View full abstract»

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  • Decoding of Cyclic Codes Using Position Invariant Functions

    Publication Year: 1965, Page(s):233 - 240
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (486 KB)

    Ratios that are sufficient to detect classes of error patterns in cyclic codes are discussed. Systematic procedures for the correction of Bose-Chaudhuri codes are given; it is shown that these are quite fast but practical only for small numbers of random errors. It is seen that there is the capability of simultaneous independent and burst error correction. View full abstract»

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  • A Comparison of Pseudo-Noise and Conventional Modulation for Multiple-Access Satellite Communications

    Publication Year: 1965, Page(s):241 - 255
    Cited by:  Papers (4)  |  Patents (32)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (725 KB)

    This paper compares pseudo-noise (PN) with conventional modulation techniques for multiple-access satellite communications of voice messages. The reference for all comparisons is the conventional frequency-division multiplex telephone system. The comparison study is concerned with theoretical channel parameters as well as practical considerations which are unique to satellite communications. For P... View full abstract»

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  • A Pulsed Pseudo-Noise VHF Radio Set

    Publication Year: 1965, Page(s):256 - 263
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (479 KB)

    The design of a radio set using pulsed pseudo-noise signals is described. The unit uses pulse position modulation and matched-filter detection. The use of pulse compression techniques permits the radio to achieve good signal detectability; it also permits privacy for each of several sets operating in a common channel. Characteristics of the 280 Mc/sec rf system are given and the call-up logic for ... View full abstract»

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  • Analysis and Simulation of a Digital Matched Filter Receiver of Pseudo-Noise Signals

    Publication Year: 1965, Page(s):264 - 273
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (484 KB)

    This paper discusses the performance of a digital matched filter receiver matched to a biphase-modulated signal in a clutter environment consisting of other biphase-modulated signals. Analytic results for a white-Gaussian model and for a non-linear capture model are compared with simulation results obtained from an IBM 7094 computer. The white-Gaussian model is in general agreement with the simula... View full abstract»

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  • Design of an Automatic Telephone Intercept Switch

    Publication Year: 1965, Page(s):274 - 281
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (453 KB)

    A system has been designed to automatically perform the functions of intercepting misdirected telephone calls and providing correct dialing information. This paper concentrates on the design of the switching unit of the system. The switch is a space-division, wired-logic controlled device using dry-reed relays as crosspoints. It is organized so that separate networks perform the functions of conce... View full abstract»

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  • Filter Performance in Integrated Switching and Multiplexing

    Publication Year: 1965, Page(s):282 - 291
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (554 KB)

    To achieve the advantages of a new technique (ISAM) for integrating the functions of time-division switching and frequency-division multiplexing, it is necessary to design filters that are somewhat different from those used in conventional switching and multiplexing systems. This paper analyzes the performance of ISAM filters. Since in the new technique signals are resonantly transferred between b... View full abstract»

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  • On Definitions of a Burst

    Publication Year: 1965, Page(s):292 - 293
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (229 KB)

    One of the accepted definitions of a “burst” in coding theory is the following: “A burst of length b is a vector whose only nonzero components are among b successive components, the first and last of which are nonzero.” View full abstract»

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  • A Technique for Determining and Coding Subclasses in Pattern Recognition Problems

    Publication Year: 1965, Page(s):294 - 302
    Cited by:  Papers (13)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (560 KB)

    The problem of organizing and partitioning large amounts of data into classes such that all data in one class will have similar properties is well known in pattern recognition research. The first step in the process, a cluster finding technique, involves grouping a large amount of data into clusters which must be detected and encoded so that automatic pattern recognition can take place. This paper... View full abstract»

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  • Thermal Problems of the Injection Laser

    Publication Year: 1965, Page(s):303 - 314
    Cited by:  Papers (12)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (586 KB)

    Heat is produced during the operation of an injection laser. The thermal conduction problems associated with the flow of the heat away from the junction region have been solved and the temperature increase of the junction has been calculated for several simple model cases. The results have been applied to the calculation of thermal limitations on the performance of gallium arsenide lasers. View full abstract»

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  • Properties of GaAs Diodes with [P-P0-N] Structures

    Publication Year: 1965, Page(s):315 - 326
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (643 KB)

    The electrical and electroluminescent properties of GaAs diodes with P-P0-N structure are discussed with special emphasis on their negative resistance characteristics. A description is given of the fabrication of diodes, consisting of a central, manganese-doped, high-resistivity layer (the P0 region) between low-resistivity P- and N-layers. The theory of Dumke for the origin ... View full abstract»

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  • Vapor-Phase Polishing of Silicon with H2-HBr Gas Mixtures

    Publication Year: 1965, Page(s):327 - 329
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (354 KB)

    The production of smooth, flat, and clean surfaces on semiconductors, such as silicon and germanium, for the fabrication of planar devices is generally achieved by a combination of mechanical and chemical polishing procedures. With suitable equipment and fine polishing grit a skilled operator can mechanically polish a silicon single-crystal disk to optical flatness. Such treatment leaves a mechani... View full abstract»

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  • Two-Dimensional Laser Deflection Using Fourier Optics

    Publication Year: 1965, Page(s):333 - 335
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (310 KB)

    Although several methods of rapid light deflection have been proposed by Bergmann and others,1 the problem of two-dimensional deflection is still not completely solved. The purpose of this communication is to examine the feasibility of a method of diffracting the collimated monochromatic light of a laser by means of the diffraction spectrum of crossed objects having variable frequency, ... View full abstract»

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  • Fatigue Strength of Case Hardened Steel Specimens Containing Through-The-Case Cracks

    Publication Year: 1965, Page(s):336 - 338
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (297 KB)

    Business machine components made from steel strip often require case hardened surfaces for adequate wear resistance and/or strength. Straightening operations, following the case-hardening heat treatment, may then be required to produce finished components which conform to flatness or straightness requirements. Subsequent magnetic particle examinations may reveal that the majority or all of the com... View full abstract»

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  • Technical Papers by IBM Authors Published Recently in Other Journals

    Publication Year: 1965, Page(s):339 - 350
    IEEE is not the copyright holder of this material | PDF file iconPDF (692 KB)
    Freely Available from IEEE
  • Recent IBM Patents

    Publication Year: 1965, Page(s):351 - 352
    IEEE is not the copyright holder of this material | PDF file iconPDF (202 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1965, Page(s):353 - 355
    IEEE is not the copyright holder of this material | PDF file iconPDF (294 KB)
    Freely Available from IEEE
  • Contents of previous two issues

    Publication Year: 1965, Page(s):356 - 357
    IEEE is not the copyright holder of this material | PDF file iconPDF (242 KB)
    Freely Available from IEEE

Aims & Scope

The IBM Journal of Research and Development is a peer-reviewed technical journal, published bimonthly, which features the work of authors in the science, technology and engineering of information systems.

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Editor-in-Chief
Clifford A. Pickover
IBM T. J. Watson Research Center