Device for registration of objects

  • US 4,242,661 A
  • Filed: 03/16/1976
  • Issued: 12/30/1980
  • Est. Priority Date: 03/27/1975
  • Status: Expired due to Term
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First Claim
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1. A device for registration of a first type of objects, here called registration objects, which move relative to a second type of objects, here called registration places, which registration objects, for example, may be vehicles, and the registration places may be places along a road section passed by the vehicles, which device comprises a plurality of recording units attached one in each registration place or on each registration object, and a plurality of registration transceivers attached one on each registration object or in each registration place, and each recording unit comprising an emitter (20), a receiver (23) and an indication unit (24), and each registration transceiver comprising (a) a frequency converter for converting a first signal received from said emitter to a second signal without adding new energy to the signal, which second signal is frequency shifted by a certain amount relative to the first signal, (b) a coding device to provide said second signal with a code individual for the registration transceiver and (c) an emitter device for emitting said second coded signal, said receiver of the recording unit being adapted to receive said second signal, and its indication unit being adapted to indicate said code, characterized in that said frequency converter comprises a modulator, which modulates the first signal in such a manner, that at least one sideband frequency component is formed, and that the coding device is adapted to provide the frequency component with said code individual for the registration transceiver, preferably by starting and stopping said modulator in accordance with a pattern constituting said code.

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