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Proceedings of the IEE - Part IIIA: Television

Issue 20 • Date 1952

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Displaying Results 1 - 24 of 24
  • Industrial and professional applications of television technique

    Publication Year: 1952, Page(s):651 - 664
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2526 KB)

    The rapid development of television as an entertainment medium has resulted in considerable engineering effort being directed at perfecting the performance and reliability of the analysis of a picture into an electrical waveform, the undistorted transmission of this waveform over a radio or cable link and its synthesis back to the reconstituted picture. This complete chain of transmission and rece... View full abstract»

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  • Television distribution by wire

    Publication Year: 1952, Page(s):665 - 672
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1025 KB)

    Television distribution by wire networks, mainly for densely populated urban areas, is described. The subject is treated by considering the various types of network and transmitting and receiving systems. Attention is mainly focused on screened quad cable and coaxial cable. Transmitting and receiving systems are considered under two main subdivisions¿those distributing unmodified waveform and tho... View full abstract»

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  • The electronic camera in film-making

    Publication Year: 1952, Page(s):673 - 679
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1140 KB)

    The paper considers the cinematograph camera and assesses its inherent limitations. The advantages of multiple-camera working are discussed, with special reference to the electronic camera; the recording of an electronic image is shown to be the culminating development. The paper discusses picture quality, contrast range and tonal fidelity, and the objective and subjective evaluation of definition... View full abstract»

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  • The specification and testing of television wire-broadcasting systems

    Publication Year: 1952, Page(s):680 - 695
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2041 KB)

    In view of the continued growth of the wire broadcasting of sound programmes, attention has been given to the possibilities of the wire broadcasting of television programmes since the television service first commenced in 1936. The first licence for commercial operation of a television wire-broadcasting system was issued by the Post Office in the autumn of 1950 and four systems were in operation b... View full abstract»

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  • A precision synchronizing system for large-screen television equipment

    Publication Year: 1952, Page(s):696 - 707
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1468 KB)

    High-grade television receiving equipments, such as will be needed in large-screen installations, require a considerably more satisfactory synchronizing system than is provided in commercially-manufactured home receivers. A description is given of a complete circuit system of original conception, developed for incorporation into an experimental cinema equipment. It provides, under precise local co... View full abstract»

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  • Some aspects of a cathode-ray-tube projector for large-screen television in cinemas

    Publication Year: 1952, Page(s):708 - 720
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2073 KB)

    The paper deals with the development of a large-screen cathode-ray-tube projector employing the Schmidt optical system and a back-aluminized projector tube, and is concerned mainly with the design of the optical system, the tube and the associated electron-optical components. A brief description is given of developments which took place prior to the advent of the back-aluminized tube. The performa... View full abstract»

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  • An application of television to the demonstration of operative surgery

    Publication Year: 1952, Page(s):721 - 728
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1204 KB)

    The paper discusses the provision of television equipment for viewing surgical operations in teaching hospitals. After considering the specific conditions which prevail in an operating theatre, the description of a particular television equipment demonstrates an approach to these problems. Electrically this design follows closely that used in a standard 405-line camera channel employed with the C.... View full abstract»

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  • An industrial instrument for the observation of very-high-speed phenomena

    Publication Year: 1952, Page(s):729 - 746
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1869 KB)

    The purpose of this instrument is to facilitate the observation and recording of objects moving at very high speeds and events taking place in extremely short times. In particular, it is intended to enable very fast repetitive motion to be observed stroboscopically, and such transient phenomena as burning high explosives to be recorded photographically. The equipment described has been designed in... View full abstract»

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  • The flying-spot microscope

    Publication Year: 1952, Page(s):747 - 757
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1603 KB)

    A cathode-ray tube providing a television raster of high brilliance and short time-constant is placed in front of the eyepiece of a microscope. The objective produces a minute spot of light that scans the preparation under examination. The amount of light transmitted is determined by the density of the specimen, and the transmitted light is picked up by a multiplier photocell, the output of which ... View full abstract»

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  • Discussion on 'Industrial television' at the Convention on the British Contribution to Television, 30th April, 1952

    Publication Year: 1952, Page(s):757 - 759
    IEEE is not the copyright holder of this material | PDF file iconPDF (555 KB)
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  • The authors' replies to the discussion on "Industrial television"

    Publication Year: 1952, Page(s):759 - 760
    IEEE is not the copyright holder of this material | PDF file iconPDF (398 KB)
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  • Television as a communication problem

    Publication Year: 1952, Page(s):761 - 770
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1761 KB)

    The title of the paper is one more indication of a gradual awakening to the necessity for conserving natural resources¿in this case ether spectrum-space. It is becoming increasingly important to achieve maximum efficiency in the transmission of television signals, and this is discussed under two main headings: Broadcast Television, where the choice of system is limited by the cost and maintenance... View full abstract»

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  • Some factors in the design of deflecting coils for cathode-ray beam systems

    Publication Year: 1952, Page(s):771 - 776
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (710 KB)

    The paper deals with the deflection of a narrow beam of electrons focused on to a screen beyond the deflecting coils, and its subject matter is applicable to most types of transmitting and receiving cathode-ray tubes in which the deflecting fields exist in an otherwise field-free space. The deflecting coil is first considered as a series of long conductors parallel to the undeflected beam, and the... View full abstract»

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  • The design of linear-phase low-pass filters

    Publication Year: 1952, Page(s):777 - 787
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1086 KB)

    The general principles underlying the design of low-pass filters with quasi-linear phase characteristics are considered, and a method suitable for the design of certain low-pass filters required in television transmission equipment is described. Adequate linearity of phase response can be obtained over the whole pass band only by limiting the discrimination which is required in the attenuation reg... View full abstract»

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  • Apparatus for the measurement of phase delay in television transmission circuits and in associated equipment

    Publication Year: 1952, Page(s):788 - 795
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (981 KB)

    The paper defines phase delay, and describes apparatus employing a novel principle that enables direct measurements of phase delay to be made. The apparatus is suitable for a frequency range from 100 kc/s to 10 Mc/s, and both through and loop circuits may be measured. For delays of less than 1 microsec the error is within ± 0.01 microsec; the range of measurement can be extended to 10 microsec bu... View full abstract»

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  • Fluctuation noise in television-camera head amplifiers

    Publication Year: 1952, Page(s):796 - 803
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1148 KB)

    The usual input circuit for a head amplifier associated with a pick-up tube of the C.P.S. Emitron type is effectively a capacitance shunted by a resistance, the former consisting of the output capacitance of the tube and the input capacitance of the amplifier. An improvement in signal/noise ratio for the higher video frequencies is shown to be obtainable by modifying the input circuit by connectin... View full abstract»

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  • A gamma-control circuit using crystal diodes

    Publication Year: 1952, Page(s):804 - 810
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (635 KB)

    First, the requirements of gamma-control circuits are discussed in relation to a variety of television processes and it is noted that it is desirable to have a close approximation to a simple power law under all conditions, a continuously-variable index over a wide range with the amplitude of the output signal maintained constant, and an adequate bandwidth following gamma distortion. A basic bridg... View full abstract»

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  • A variable-definition camera channel for the appraisal of television standards

    Publication Year: 1952, Page(s):811 - 820
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1394 KB)

    The paper describes an apparatus constructed for the study of various alternative standards of definition in television systems. The problem of appraising and comparing pictures produced by such television systems is discussed, and a consideration of the instrumental weaknesses in any method which involves two separate channels presenting the alternatives side by side, leads to the conclusion that... View full abstract»

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  • Test equipment for television transmission circuits

    Publication Year: 1952, Page(s):821 - 833
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1872 KB)

    The standard of performance of a complete television transmission system is considered and definite limits of distortion of amplitude and phase, with respect to frequency, noise and linearity, are suggested. Five instruments, a video-frequency oscillator, a video-frequency amplifier detector, a test pulse generator, a waveform monitor and group delay measuring equipment devised to measure these di... View full abstract»

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  • Some factors in the design of wide-band amplifiers for television

    Publication Year: 1952, Page(s):834 - 841
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1012 KB)

    The figure of merit of a wide-band amplifier is the ¿stage-gain times bandwidth¿ for a stated attenuation at the edges of the band. However, it is necessary also that the phase error within the band should not be too great, that the cost of components should not be excessive, that the circuit should be easy to set up and that the response should not vary unduly with changes in the valve characte... View full abstract»

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  • Some fundamental aspects of colour television

    Publication Year: 1952, Page(s):842 - 853
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1282 KB)

    A review is given of the physical and physiological factors relevant to the analysis and synthesis of television pictures. The first part of the paper summarizes the colorimetric requirements and describes the simultaneous and sequential methods. The second part deals with measurement technique, including camera-tube spectral sensitivity and cathode-ray-tube emission spectra, and gives some typica... View full abstract»

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  • Colour television: some subjective and objective aspects of colour rendering

    Publication Year: 1952, Page(s):854 - 860
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1104 KB)

    After a brief review of the literature on the more general aspects of colour in television, attention is drawn to the subjective aspects of picture quality, both in monochrome and in colour. Reference is made to earlier work on a somewhat similar problem of colour rendering in which the binocular matching technique has given promising results. Based on this experience, apparatus and methods are de... View full abstract»

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  • Discussion on 'General system aspects' at the Convention on the British Contribution to Television, 2nd May, 1952

    Publication Year: 1952, Page(s):860 - 865
    IEEE is not the copyright holder of this material | PDF file iconPDF (960 KB)
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  • The authors' replies to the discussion on "General system aspects"

    Publication Year: 1952, Page(s):865 - 866
    IEEE is not the copyright holder of this material | PDF file iconPDF (318 KB)
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