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IRE Transactions on Information Theory

Issue 1 • March 1955

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Displaying Results 1 - 12 of 12
  • An analysis of the detection of repeated signals in noise by binary integration

    Publication Year: 1955, Page(s):1 - 9
    Cited by:  Papers (36)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1045 KB)

    An analysis of the detection of repetitive signals in noise by binary integration techniques is made. An expression for the effective signal-to-noise ratio of the quantized video is obtained and is shown to apply to any half-wave second detector. A comparison of analog and digital integration is made, and it is further shown that digital integration is, at most, 1.9 db poorer due to the quantizati... View full abstract»

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  • An expansion for some second-order probability distributions and its application to noise problems

    Publication Year: 1955, Page(s):10 - 15
    Cited by:  Papers (105)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (763 KB)

    In this paper it is shown that, in general, second-order probability distributions may be expanded in a certain double series involving orthogonal polynomials associated with the corresponding first-order probability distributions. Attention is restricted to those second-order probability distributions which lead to a "diagonal" form for this expansion. When such distributions are joint probabilit... View full abstract»

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  • Predictive coding--I

    Publication Year: 1955, Page(s):16 - 24
    Cited by:  Papers (30)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1624 KB)

    Predictive coding is a procedure for transmitting messages which are sequences of magnitudes. In this coding method, the transmitter and the receiver store past message terms, and from them estimate the value of the next message term. The transmitter transmits, not the message term, but the difference between it and its predicted value. At the receiver this error term is added to the receiver pred... View full abstract»

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  • Predictive coding--II

    Publication Year: 1955, Page(s):24 - 33
    Cited by:  Papers (68)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1602 KB)

    In Part I predictive coding was defined and messages, prediction, entropy, and ideal coding were discussed. In the present paper the criterion to be used for predictors for the purpose of predictive coding is defined: that predictor is optimum in the information theory (IT) sense which minimizes the entropy of the average error-term distribution. Ordered averages of distributions are defined and i... View full abstract»

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  • The linear, input-controlled, variable-pass network

    Publication Year: 1955, Page(s):34 - 39
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (915 KB)

    This paper describes the study and development of a linear, variable-pass network system which is controlled by the Fano short-time autocorrelation function of the input. Given an input function, the message, whose short-time power spectrum varies in an unpredictable manner with time, and to which there has been added a different function, the disturbance, whose short-time power spectrum is either... View full abstract»

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  • Spectral power density functions in pulse time modulation

    Publication Year: 1955, Page(s):40 - 46
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    Spectral power density functions corresponding to various types of pulse shapes, and probability distribution functions arising in the study of pulse time modulation problems are computed. The results are presented in tabular form. The following cases are considered: PAM and PPM, for arbitrary pulse shape, PDM, for rectangular, Gaussian, and error-function pulse shapes, and SEM, for rectangular pu... View full abstract»

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  • A note on the sampling theorem

    Publication Year: 1955, Page(s):47 - 48
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (258 KB)

    The human operator often perceives rate as well as amplitude information in sampling various displayed continuous parameters. It is therefore necessary to extend the Sampling Theorem to allow the analysis of certain man-machine relations. The result is stated and the required mathematics included in the Appendix. Certain distinct problem areas where this extension can be employed fruitfully are in... View full abstract»

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  • Statistical calculation of word entropies for four Western languages

    Publication Year: 1955, Page(s):49 - 53
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (697 KB)

    Using a modified version of Shannon's method, comparative figures for the word-letter entropies of printed English, French, German, and Spanish are obtained and the method described. View full abstract»

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  • On the modulation levels in a frequency multiplexed communication system by statistical methods

    Publication Year: 1955, Page(s):54 - 59
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (904 KB)

    This paper presents a mathematical analysis with experimental verification of the distribution of the instantaneous voltage of a complex signal resulting from the combination at random of a small numbernof sinusoidal oscillations. The resulting calculated distributions are plotted in the form of a set of probability curves for comparison with curves obtained by experiment. Further labor... View full abstract»

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  • On the response of a certain class of systems to random inputs

    Publication Year: 1955, Page(s):59 - 61
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (405 KB)

    This paper deals with the connection between vector Markoff processes and the response of a lumped constant parameter linear system composed of a finite number of elements. It was known that if a Gaussian process which is one component of a vector Markoff process passes through such a system, the result is also Gaussian and may be considered as one component of a higher dimensional vector Markoff ... View full abstract»

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  • Noise in driven systems

    Publication Year: 1955, Page(s):62 - 65
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (606 KB)

    It is known that a direct relation exists between the noise in a system in equilibrium and transient drift toward equilibrium. It seems that a similar relation should exist for a system in a nonequilibrium stationary state. It is now necessary to distinguish between two types of transients; those produced by selecting those systems satisfying certain initial and those produced by actual physical p... View full abstract»

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  • Design and performance of phase-lock circuits capable of near-optimum performance over a wide range of input signal and noise levels

    Publication Year: 1955, Page(s):66 - 76
    Cited by:  Papers (101)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1326 KB)

    Phase locked loops (PLLs) provide an efficient method for detection and tracking of narrow-band signals in the presence of wide-band noise. This paper explains how minimum-rms-error loops may be designed if the input-signal level, input-noise level, and a specification for transient performance are given. However, the system performance of PLLs departs rapidly from the best obtainable performance ... View full abstract»

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Aims & Scope

This Transactions ceased production in 1962. The current retitled publication is IEEE Transactions on Information Theory.

Full Aims & Scope