It is known that there are, on the one hand, videotelephones and, on the other hand, surveillance systems in which a room is monitored by a video camera and the pictures generated by this video camera are displayed on a surveillance screen. Such a surveillance system is quite expensive. The problem of the invention lies in creating a suitable room surveillance system with little expenditure. This object is achieved by providing the videotelephone (1) with a surveillance circuit (3). The surveillance circuit (3) exhibits a frame buffer (10) in which the frames supplied by the video camera (4) are stored. The frame in each case supplied by the video camera (4) is compared with a stored frame recorded shortly before in a comparison circuit (11) and an alarm signal is output when the two frames differ by a predetermined measure. The surveillance circuit (3) extends the field of application of the videotelephone. <IMAGE>




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Patent Citations (0)

    Publication numberPublication dateAssigneeTitle

NO-Patent Citations (2)

    SEL-Prospekt "Telefonieren von Angesicht zu Angesicht"
    W. KAISER: Interaktive Breitbandkommunika- tion, Springer Verlag 1982, ISBN 3-540-11895-0, S.6 u. 7, 41-44, 110-121

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    DE-19826087-C2August 17, 2000Alcatel SaEinrichtung einer Endstelle eines Telekommunikationsnetzes
    EP-0738065-A1October 16, 1996Alcatel SEL AktiengesellschaftDispositif de télésurveillance
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    FR-2810775-A1December 28, 2001De Verneuil Francois HuardRapid response protected zone intruder protection system having protected zone digital image files transformed and time comparisons change detection files control centre sending/alerting response forces
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