Abstract: An apparatus and method of processing signals from a passive infrared sensor evaluates energy of received signals. An integration or accumulation process can be used to provide an indicator of signal energy. This indicator can be compared to a predetermined alarm threshold to determine if an alarm indication should be generated.

Abstract: A method and apparatus are provided for automatically testing microwave instruction detection modules of a security system. The method includes the steps of detecting intruders within a protected space by monitoring a Doppler output of a signal extraction circuit coupled to a microwave transceiver module, varying a frequency of direct current power pulses applied to the microwave transceiver module, detecting a difference in magnitude of the Doppler output of the signal extraction circuit over the varied frequency and comparing the detected difference with a fault threshold level.

Abstract: An apparatus and method of processing signals from a passive infrared sensor evaluates energy of received signals. An integration or accumulation process can be used to provide an indicator of signal energy. This indicator can be compared to a predetermined alarm threshold to determine if an alarm indication should be generated.

Abstract: A method and apparatus are provided for automatically testing microwave instruction detection modules of a security system. The method includes the steps of detecting intruders within a protected space by monitoring a Doppler output of a signal extraction circuit coupled to a microwave transceiver module, varying a frequency of direct current power pulses applied to the microwave transceiver module, detecting a difference in magnitude of the Doppler output of the signal extraction circuit over the varied frequency and comparing the detected difference with a fault threshold level.

Abstract: The present invention provides an apparatus and a method for generating vital information signals which are formed by a pulse train made up of bursts of the same width and distance, wherein each burst is made up of a given number of pulses of a specific frequency. The apparatus according to the present invention comprises a pulse signal generating means and a signal output circuit for generating pulse signals and shaping their waveforms and structures to meet specific requirements. The method of the present invention generates the above-mentioned signals by means of information recording medium and signal reproducing apparatus, and provides the same for medical or health care uses.

Abstract: An apparatus for detecting bioelectric signals according to the present invention, comprises: a detecting electrode, a reference electrode, a stimulating signal generating circuit, a micro-current amplifying circuit, a signal processing circuit and an output device. The detecting apparatus applies a stimulating voltage in the range of 0.5-3.0 V to a reference acupoint on human or animal body via the reference electrode, and detects simultaneously the response current in the range 10.sup.-11 -10.sup.-4 A at different acupressure points on the body with the detecting electrode urged against the acupressure point, then the time response of the current is processed by the signal processing circuit to obtain the useful information for diagnosing diseases and verifying the therapeutic effects.