Abstract: A system and method for reducing interference caused by fluorescent light on alarm system components using synchronous sampling is provided. The system incorporates a detector for detecting the line frequency of a power line and synchronizes the security system to the detected line frequency. The detector employed may be a light emitting diode configured as a photodetector, an antenna tuned for frequencies near 55 Hz, or a filter connected to an output of a Microwave channel.

Abstract: A system and method for detecting the presence of a moving object within a detection zone is provided. The system includes a first sensor responsive to light in a first range of wavelengths in the detection zone, a second sensor responsive to light in a second range of wavelengths in the detection zone, wherein the second range of wavelengths is different from the first range of wavelengths, and a processing component for generating a variable threshold value for the first sensor based upon at least maximum and minimum output signals from the second sensor within a predetermined period of time, and for comparing the first output signal with the variable threshold value. The processing component generates an activating signal if the first output signal exceeds the threshold value.

Abstract: A motion detection system for detecting the presence of a moving object within a detection zone. A first sensor responsive to light in a first range of wavelengths in the detection zone is provided to generate a first output signal indicative of a first detected parameter of the light in the first range. A second sensor responsive to light in a second range of wavelengths in the detection zone is provided to generate a second output signal indicative of a second detected parameter of the light in the second range. The second range of wavelengths is different from the first range of wavelengths and the second sensor is disposed approximately to the first sensor. A processing component is provided to generate a variable threshold value for the first sensor based upon the second output signal indicative of a second detected parameter of the light in the second range and compare the first output signal with the variable threshold value.

Abstract: A motion detector for detecting a tampering within a detection zone. A vibration-sensing unit sensitive to vibrations applied to the detector is provided to produce a vibration output signal representative of a detected parameter of the vibrations. A light-sensing unit sensitive to light in a predetermined spectrum is provided to produce a light output signal representative of a detected parameter of the light in the predetermined spectrum. A processing unit is further provided to determine if the vibration output signal is consistent with a predetermined model indicative of a tampering and producing an activating signal accordingly.

Abstract: A motion detector for detecting a tampering within a detection zone. A vibration-sensing unit sensitive to vibrations applied to the detector is provided to produce a vibration output signal representative of a detected parameter of the vibrations. A light-sensing unit sensitive to light in a predetermined spectrum is provided to produce a light output signal representative of a detected parameter of the light in the predetermined spectrum. A processing unit is further provided to determine if the vibration output signal is consistent with a predetermined model indicative of a tampering and producing an activating signal accordingly.

Abstract: A system and method for reducing interference caused by fluorescent light on alarm system components using synchronous sampling is provided. The system incorporates a detector for detecting the line frequency of a power line and synchronizes the security system to the detected line frequency. The detector employed may be a light emitting diode configured as a photodetector, an antenna tuned for frequencies near 55 Hz, or a filter connected to an output of a Microwave channel.