By Topic

Electronics & Communication Engineering Journal

Issue 2 • Date March-April 1989

Filter Results

Displaying Results 1 - 5 of 5
  • EMC regulations within Europe

    Publication Year: 1989, Page(s):57 - 60
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (429 KB)

    As part of the process of harmonisation of technical standards needed to achieve the single European market in 1992, the European Commission has proposed a directive on EMC. The author describes the requirements contained within the proposal and, since the proposal will refer to European standards for technical requirements, a brief outline of the standards-making procedure is included.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Survey of EMC measurement techniques

    Publication Year: 1989, Page(s):61 - 70
    Cited by:  Patents (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1227 KB)

    Proposals for a European directive on electromagnetic compatibility are focusing attention on the techniques for measurement of noise and unwanted signal emissions from a wide variety of equipment. Assessment of the immunity of sensitive electronic equipment to electromagnetic disturbances, such as electrostatic discharges and RF transmissions, is equally important. The author includes an outline ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Aperture-domain signal processing

    Publication Year: 1989, Page(s):71 - 80
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (856 KB)

    An elementary reconsideration of first principles in aperture-domain processing of wave phenomena for reception (and, by reciprocity, for transmission) can yield revealing, and in some cases novel, insights into what can or cannot be achieved. The subjects covered here include direction-selective reception, superdirectivity, direction finding, focused near-field reception, circular arrays and circ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Telephones in the sky

    Publication Year: 1989, Page(s):81 - 89
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (807 KB)

    Following the rapid growth of land mobile radio, increased attention is being paid to the provision of aircraft passenger telephony services. The author reviews the requirements for such services and outlines how modern technology will shortly enable worldwide aeronautical telephony to become a reality-via satellite. The current service provisions and enabling technologies are described and an ins... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Compression of colour image data using histogram analysis and clustering techniques

    Publication Year: 1989, Page(s):93 - 100
    Cited by:  Patents (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (826 KB)

    Digitised colour images quantised at 24 bits per pel represent a considerable storage requirement. For many applications a coarser quantisation is allowable or even necessary. The authors describe three variations on a method to quantise RGB data at approximately 4 bits per pel. The main criterion in the scheme is that of a minimum perceptual distortion in the reproduced data. The MacAdam chromati... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.