| 摘要 |
<p>From an existing conventional automatic audio-doorkeeper system, there is mounted, on the one hand, a video camera (1) associated to a converter unit (2) which mixes the signals transmitted by the antenna (20) of the building with the signals generated by the video camera itself (1) so that both signals reach any of the television receivers (24) existing in the various apartments of the building, specifically the images of the video camera through a special channel selected by means of a selector (4) provided in the converter (2), and on the other hand, at the vertical (25) of the audio-doorkeeper wires, is mounted a receiver-emitter (7) to which is connected a plurality of wireless intercommunicators (8), at least one per apartment, said elements having modulated frequency emitters and receivers so that it is possible to set an audio communication in one direction or the other, as well as a door opening emitter (14) and a door opening receiver (11) which, from any wireless intercommunicator (8), can activate the electric door opening system (19) giving access to the building.</p> |
