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Electronics & Communication Engineering Journal

Issue 4 • Date Aug. 1990

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Displaying Results 1 - 4 of 4
  • The active control of sound

    Publication Year: 1990, Page(s):127 - 136
    Cited by:  Papers (5)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (835 KB)

    Active control of sound results from destructive interference between the sound field of an original acoustic source and that from a controllable array of 'secondary' acoustic sources. For this destructive interference to occur over an appreciable region of space the sound field of the secondary sources must match that from the primary source in both time and space. The spatial matching requiremen... View full abstract»

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  • ATM-based switching for the integrated broadband network

    Publication Year: 1990, Page(s):137 - 146
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1388 KB)

    Telecommunications networks based on synchronous 64 kbit/s channels are too restrictive for the future realisation of integrated broadband networks. New switching and transmission techniques, particularly those based on asynchronous transfer modes (ATM), are required. Roke Manor Research Ltd. and Plessey Research Caswell Ltd. are actively developing these new techniques at a system and technology ... View full abstract»

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  • Digital radio frequency memory

    Publication Year: 1990, Page(s):147 - 153
    Cited by:  Papers (35)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (766 KB)

    Digital radio frequency memory (DRFM) is a technique in which high-speed sampling and digital memory is used to store radio frequency and microwave signals. It is becoming a popular technique for the implementation of false-target ECM systems. The author discusses the principles of DRFM and the advantages of alternative system architectures.<> View full abstract»

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  • Retrieving 3D information from video for robot control and surveillance

    Publication Year: 1990, Page(s):155 - 164
    Cited by:  Papers (1)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1150 KB)

    A technique has been developed at Roke Manor Research Ltd. for recovering three-dimensional (3D) information from conventional video data. This is based on matching features in a scene observed from different viewpoints, either as a result of intrinsic camera or object motion or through the use of multiple cameras. The technique has been examined as a means of supplying guidance information to a r... View full abstract»

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