{"title":"Application of Boolean algebra to switching circuit design and to error detection","authors":"D. E. Muller","doi":"10.1109/IREPGELC.1954.6499441","DOIUrl":"https://doi.org/10.1109/IREPGELC.1954.6499441","url":null,"abstract":"A solution is sought to the general problem of simplifying switching circuits that have more than one output. The mathematical treatment of the problem applies only to circuits that may be represented by “polynomials” in Boolean algebra. It is shown that certain parts of the multiple output problem for such circuits may be reduced to a single output problem whose inputs are equal in number to the sum of the numbers of inputs and outputs in the original problem. A particularly simple reduction may be effected in the case of two outputs. Various techniques are described for simplifying Boolean expressions, called “+ polynomials,” in which the operation “exclusive or” appears between terms. The methods described are particularly suitable for use with an automatic computer, and have been tested on the Illiac. An unexpected metric relationship is shown to exist between the members of certain classes of “+ polynomials” called “nets.” This relationship may be used for constructing error-detecting codes, provided the number of bits in the code is a power of two.","PeriodicalId":304144,"journal":{"name":"Trans. I R E Prof. Group Electron. Comput.","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1954-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130955393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A permanent high speed store for use with digital computers","authors":"R. D. Ryan","doi":"10.1109/IREPGELC.1954.6499440","DOIUrl":"https://doi.org/10.1109/IREPGELC.1954.6499440","url":null,"abstract":"A new type of high speed store is proposed for an electronic digital computer using interpretive program techniques. The store is based on the flying spot technique used in television signal generation. The information in the store may be read rapidly but is nonerasable. This store has the advantages of high storage density, good reliability and nonvolatility of information.","PeriodicalId":304144,"journal":{"name":"Trans. I R E Prof. Group Electron. Comput.","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1954-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121946395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"An improved reading system for magnetically recorded digital data","authors":"S. Lubkin","doi":"10.1109/IREPGELC.1954.6499443","DOIUrl":"https://doi.org/10.1109/IREPGELC.1954.6499443","url":null,"abstract":"In magnetic recording of pulses, whether on drum or tape, the resulting flux pattern is affected by proximity of adjacent pulses. The best defined region is that adjacent to the maximum. In reading, the signal is the derivative of the flux. In the best defined region, this is close to a straight line passing through zero when the flux is a maximum. The slope of the curve at the zero changes sign with change of pulse polarity. A new method of reading is described which examines the signal from the head for such transitions from positive to negative or reverse as indications that a positive or negative pulse had been recorded. This is done by gating the inverted signal with the delayed signal for positive pulse reading and the inverse of this for reading negative pulses. Besides providing sharply defined outputs, this method permits reading both positive and negative pulses from a single channel without interference or ambiguity. Examples are given for using this facility for checking purposes and for storage of two types of data in a common channel.","PeriodicalId":304144,"journal":{"name":"Trans. I R E Prof. Group Electron. Comput.","volume":"125 7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1954-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124662227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Time-delay networks for an analog computer","authors":"W. J. Cunningham","doi":"10.1109/IREPGELC.1954.6499247","DOIUrl":"https://doi.org/10.1109/IREPGELC.1954.6499247","url":null,"abstract":"Time-delay networks suitable for an analog computer are designed by considering the location of poles and zeros in their transfer functions. The curve of phase shift against frequency should be a straight line. The negative slope of this curve is the time delay. Even-order derivatives of the curve automatically vanish at zero frequency. Roots of the transfer function are chosen to make vanish similarly as many as possible of the derivatives of odd order, higher than the first. Data are given for networks with one, two, three, and four pairs of roots.","PeriodicalId":304144,"journal":{"name":"Trans. I R E Prof. Group Electron. Comput.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1954-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116006064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A sub-audio time delay circuit","authors":"C. Morrill","doi":"10.1109/IREPGELC.1954.6499421","DOIUrl":"https://doi.org/10.1109/IREPGELC.1954.6499421","url":null,"abstract":"Through the use of an electronic differential analyzer arranged to give a sixth-order approximation of the Laplace shift operator, it is possible to reproduce an input signal and delay it T seconds when the highest angular frequency present in the input signal does not exceed 12/T. Inaccuracy due to nonlinear phase shift is less than 2% under these conditions. This device requires only linear computing elements, and will permit delays of seconds within a finite frequency spectrum. An application to a closed loop industrial control problem is cited and other applications are suggested.","PeriodicalId":304144,"journal":{"name":"Trans. I R E Prof. Group Electron. Comput.","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1954-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128097920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Logic, discovery, and the foundations of computing machinery","authors":"M. Maron","doi":"10.1109/IREPGELC.1954.6499415","DOIUrl":"https://doi.org/10.1109/IREPGELC.1954.6499415","url":null,"abstract":"This paper describes the logical nature of computing machines in terms of languages and the types of problems that can be solved by logical operations on languages. The problem of discovery in mathematics and empirical science is discussed, and an “inductive” machine is described which would be able to formulate hypotheses, modify them in the light of new experience and eventually discover the laws of a very simple universe.","PeriodicalId":304144,"journal":{"name":"Trans. I R E Prof. Group Electron. Comput.","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1954-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133274717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"An analog multiplier using thyrite","authors":"L. D. Kovach, W. Comley","doi":"10.1109/IREPGELC.1954.6499420","DOIUrl":"https://doi.org/10.1109/IREPGELC.1954.6499420","url":null,"abstract":"An investigation into the use of thyrite as an inexpensive nonlinear element in the electronic analog computer indicates that this material has great value as a device capable of delivering an output voltage proportional to the square of the input voltage. The factors discussed are the characteristics of the material and the means by which these may be modified to produce a device capable of squaring with an accuracy of 1.25% from dc to frequencies in excess of 1000 cps. This ability to square makes possible the more important operation of the multiplication of two variable voltages.","PeriodicalId":304144,"journal":{"name":"Trans. I R E Prof. Group Electron. Comput.","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1954-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130133317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"System design of the SEAC and DYSEAC","authors":"A. L. Leiner, W. Notz, J. L. Smith, A. Weinberger","doi":"10.1109/IREPGELC.1954.6499416","DOIUrl":"https://doi.org/10.1109/IREPGELC.1954.6499416","url":null,"abstract":"In the course of developing the system plans for the DYSEAC and the SEAC, certain standard methods and procedures were evolved for producing a large-scale digital computer design. These standard procedures cover, first, the development of system specifications, second, the development of functional plans, and finally the development of wiring plans. The later stages of these procedures are reducible to sequences of simple steps, capable of being systematically formulated in explicit terms. The similarity between these procedures and many of the data-processing procedures commonly being executed by present-day computers suggests that, with further development of these design techniques, the wiring plans for new computer systems might well be produced by existing digital machines.","PeriodicalId":304144,"journal":{"name":"Trans. I R E Prof. Group Electron. Comput.","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1954-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114751313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Digital techniques in analog systems","authors":"M. A. Meyer","doi":"10.1109/IREPGELC.1954.6499417","DOIUrl":"https://doi.org/10.1109/IREPGELC.1954.6499417","url":null,"abstract":"This paper discusses analog computation where the analog components consist of digital elements. Pulse rate is the quantity used to represent the data. Such computation systems may have many advantages over present analog techniques. The various components necessary to produce a complete computation system are described. Several examples of the use of these components to solve specific problems are shown.","PeriodicalId":304144,"journal":{"name":"Trans. I R E Prof. Group Electron. Comput.","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1954-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121566754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A high-speed correlator","authors":"Harold Bell, V. Rideout","doi":"10.1109/IREPGELC.1954.6499418","DOIUrl":"https://doi.org/10.1109/IREPGELC.1954.6499418","url":null,"abstract":"The correlation function, $phi_{ij}^{(tau)} = lim_{T rightarrow infty} {1 over T} int^{T}_{o} f_{i}(t)f_{j}(t-tau) dt$ is of great interest today because of its use in the fields of oceanography and meteorology and because of its recent applications in the field of communication. Various machines, both analog and digital, have been designed for the automatic computation of correlation functions. The machine described in this paper differs from those which have previously been described in the literature in that the speed with which it computes the integral above for each value of τ i is mainly limited by the minimum value of T permissible for a precision of a few per cent.","PeriodicalId":304144,"journal":{"name":"Trans. I R E Prof. Group Electron. Comput.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1954-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130645462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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