Warning device with transmitter and receiver - has signalling arrangement and acts as aid in monitoring movement of object

Abstract

Abstract The transmitter (I) of the warning device is accommodated in an object to be monitored, for example, a handbag, and the receiver (II) is located with the person concerned. As the distance between the transmitter (I) and the receiver (II) increases or as the receiving amplitude decreases and when dropping below a threshold given by a discriminator (8), a signalling arrangement (9) responds. The transmitter (I) operates in the pulse mode and the receiver (II) is clocked by the transmission pulse. The transmitter (2) emits a modulated or coded signal and the discriminator (8) of the receiver (II) checks out the presence or the absence of the modulated message (1).

Inventors

• 👤 Walter Holzer

Bibliographic Details