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Proceedings of the IRE

Issue 8 • Date Aug. 1940

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Displaying Results 1 - 16 of 16
  • [Front cover]

    Publication Year: 1940 , Page(s): c1
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  • Rochester Fall Meeting

    Publication Year: 1940 , Page(s): c2
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  • Table of contents

    Publication Year: 1940 , Page(s): nil1
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  • Information about the Society

    Publication Year: 1940 , Page(s): nil2
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  • Quality in Television Pictures

    Publication Year: 1940 , Page(s): 343 - 350
    Cited by:  Papers (2)
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    Present television standards specify certain factors which determine the appearance of a television picture only to a limited extent. Other factors, however, such as contrast, gradation, brilliance, and the shape of the scanning spot, are fully as important. A photographic method for producing artificial television pictures which permits varying several of these factors has been developed. Pictures are shown which were obtained by this method and which approach ideal quality within a given set of standards. View full abstract»

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  • Portable Equipment for Observing Transient Response of Television Apparatus

    Publication Year: 1940 , Page(s): 351 - 360
    Cited by:  Papers (7)
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    An apparatus which supplies a perfect transient, either directly or as the modulation of an ultra-high-frequency carrier, to a television amplifier or receiver and records its transient response on the screen of a synchronized oscilloscope is described. Performance requirements are discussed and some design details described, among these a carbon-disk attenuator suitable for ultra-high frequencies, also a single-lever position control and a scale projection for the oscilloscope. View full abstract»

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  • Ultra-Short-Wave Transmission over a 39-Mile "Optical" Path

    Publication Year: 1940 , Page(s): 360 - 369
    Cited by:  Papers (2)
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    Continuous records of ultra-short-wave transmissionon wavelengths of 2 and 4 meters, over a good "optical" path, have shown variations in the received signal strength. These variations can be explained as being due to wave interference; an interference which varies with the changes in the composition of the troposphere. Some of the variations are due to changes in the dielectric-constant gradient of the atmosphere near the earth. Other variations are explicable in terms of reflectionsfrom the discontinuities at the boundaries of different air masses. The diurnal and annual meteorological factors which affect the transmission are discussed. View full abstract»

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  • Some Factors Affecting the Choice of Lenses for Television Cameras

    Publication Year: 1940 , Page(s): 369 - 374
    Cited by:  Papers (2)
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    The design of a television camera for a particular use involves the selection of a lens which, under the poorest conditions of illumination which are expected, will form a sufficiently bright image to meet the requirements of the pickup tube used. When the size and sensitivity characteristics of the pickup tube and video-frequency amplifier, the required signal-to-noise ratio, and the angle of view of the camera are known, the specifications of the lens can be computed. If a tube having a sensitive surface of width W inches and an operating sensitivity of s microamperes per lumen is to be used in picking up a scene having a surface brightness B candles per square foot, with a horizontal angle of view α, the following equations can be used to determine the lens to be used: T, focal length: F=-cot -inches 2 2 0.064 W VITBs numerical aperture: tf= I,/ 0 IL, N in which T is the light-transmission factor of the lens, I,, is the equivalent root-mean-square noise current at the input of the amplifier used with the tube, and N is the required signal-to-noise ratio. The paper discusses the derivation of these equations and includes charts to facilitate computations. Comparison of predicted results with the observed performance of the apparatus have shown good correlation. View full abstract»

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  • A Frequency-Modulation Monitoring System

    Publication Year: 1940 , Page(s): 374 - 378
    Cited by:  Papers (1)
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    In operation of a frequency-modulated station it is necessary to monitor the frequency deviation accurately so that the signal remains within the allocated band. This is important from the standpoint of adjacent-channel interference and the distortion produced in a receiver when the frequency devsation exceeds the limits of the detector. This paper presents an analytical discussion and computed charts of the spectra produced by frequency-modulated waves. A monitor which plots the amplitude and frequency distribution of the spectrum on the screen of a cathode-ray oscilloscope is described and calibration of the monitor is discussed. Photographs taken from the screen of the monitor are presented and compared with computed patterns. View full abstract»

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  • The Ionosphere and Radio Transmission, July, 1940, with Predictions for October, 1940

    Publication Year: 1940 , Page(s): 378 - 379
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  • Institute news and radio notes

    Publication Year: 1940 , Page(s): 380 - 384
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  • Correspondence

    Publication Year: 1940 , Page(s): 385 - 386
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  • Books

    Publication Year: 1940 , Page(s): 386 - 387
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  • Contributors

    Publication Year: 1940 , Page(s): 387 - 388
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  • Positions open

    Publication Year: 1940 , Page(s): vii
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  • Index [of advertisers]

    Publication Year: 1940 , Page(s): viii
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Aims & Scope

This Periodical ceased production in 1962. The current retitled publication is Proceedings of the IEEE.

Full Aims & Scope