Patent ID: 6989746

Claim:
An alarm device for alerting of burglary or undesired entry into a construction, including a building, installation or structure, the alarm device being connectable to at least one alarm unit or alarm system that is provided with a signal receiver, and that is prepared to interpret processed signals from said alarm device; wherein the alarm device comprises: an alarm chip ( 10 ) that is suitable for being fixedly attached to an access opening medium in the construction, the alarm chip ( 10 ) being provided with at least a signal transmitter; an energy source; a sensor for detecting motions and vibrations of said access opening medium, and for outputting a series of analogue electric signals corresponding to said motions and vibrations, said sensor in the alarm chip ( 10 ) comprising an accelerometer that measures, at least in one direction, acceleration values (dv/dt) corresponding to said motions and vibrations; an ADC-component (analogue to digital converter) coupled to said sensor, said component converting the analogue signals to a series of digital electric signals and outputting these signals; an electronic signal processing circuit that is run by a processor, that processes said digital signals, that is capable of outputting processed signals to said signal receiver provided to said at least one alarm unit or alarm system associated with the construction, and that said signal processing circuit is provided with at least one algorithm containing instructions, in program form, that define acceleration signal characteristics and patters corresponding to various types of said motions and vibrations, the at least one algorithm also containing instructions for recognizing and distinguishing said acceleration signal characteristics and patterns as either alarm-justifying or non-alarm-justifying motions and vibrations of said access opening medium, and that the signal processing circuit is arranged to continuously output processed signals to said at least one alarm unit or alarm system associated with the construction, and that the signal processing circuit is arranged to output an alarm-activating signal when it recognizes acceleration signals corresponding to said alarm-justifying motions and vibrations, and to output an “alive & well” signal (a non-alarm signal) when it either recognizes acceleration signals corresponding to said non-alarm-justifying motions and vibrations, or when no motions and vibrations are recognized.