Abstract: A security system sensor has a lens lying in a forward plane that focuses received energy to a focal point that is internal to the sensor. A sensing element is located at or near the focal point of the lens. A funnel-shaped chamber between the lens and the focal point is substantially vacant so that received energy is received by the sensing element. A battery housing is positioned so that the physical volume of a battery power source contained therein is mainly rearward of the lens and the vacant funnel-shaped chamber, yet forward of a plane that is immediately rearward of the sensing element. Also, a dividing barrier, interposed between the chamber and the battery power source, extends to and seals with the sensing element and the lens, thereby providing a seal for the vacant, funnel-shaped chamber.

Abstract: A single or a plurality of like transmitters are remotely positioned from a single receiver. Each one of the transmitters has an infra-red sensor that when activated by the heat of a moving object transmits a first single pulse to set the AGC of the single receiver and then when the AGC level is established transmits a series of coded identification pulses at substantially the same gain level as the first pulse to the receiver. The coded pulses identify one of a plurality of channels in the receiver that contain a pre-recorded message relating to the transmitting transmitter. When a channel is selected that pre-recorded message is audible produced by the receiver. Typically, the message will announce the location of the transmitting transmitter to a listener which indicates that there is an intruder detected at the transmitter location.

Abstract: A two wire detection device includes a relay switch setable to a high and a low impedance state and electrically coupled between a first terminal of an AC source and a first leg of a load, a second leg of which is connected to a second terminal of the AC source. The device includes an energy storage device electrically coupled to the first terminal of the AC source and electrically connected to the first leg of the load. Charge control means interposed between the first terminal of the AC source and the energy storage device regulate the voltage across the energy storage device. A detection control device is electrically connected across the energy storage device and to the switching device for detecting the presence of a condition for monitoring and setting the state of the switching device based thereon such that power is available to the detection control device regardless of the state of the switch.

Abstract: A monitoring and detection system that continually monitors a person(s) presence passing through areas such as rooms, homes, buildings and the like. The system can include multiple operating modes such as a home mode for greeting visitors and normal facility users as well as a secure mode for protecting the facility and occupants from intruders. The novel system provides for multi-task control of all electrical functions in a home such as air conditioning, lights, power and the like. The system can operate events via completely timed static events(i.e. for preselected time periods). The invention can also be used to activate or deactivate events through sensor detection. The preferred embodiment uses ultrasonic sweep sensors which can be programmed to automatically detect person(s) animal(s) that cross protected areas over certain times of the day, week, month based on different conditions, as well as dry contact sensors such as contact switches for doors and windows and the like.

Abstract: An improved body sensing device capable of precisely sensing a living body at a standstill by discriminating the living body from other substances than the living body. An oscillator provided with a detection coil oscillates a high frequency signal. As there is no object or exists baggage or the like near the detection coil, the oscillator oscillates and generates a high frequency signal at a high level to be detected by a detector for turning on a transistor of a controller. As there exists a human body near the oscillator, the oscillation stops and the input signal from the detector to the transistor is extremely lowered, so that the transistor is turned off.

Abstract: A vehicular telecommunications system having user detection features. A telephone controller 504 is comprised in a vehicle and adapted to process a plurality of telephone signals. A telephone 37 is configured to receive telephone calls for the user from sources external to the vehicle in which the telephone is installed. A user detector 52 is operably coupled to the telephone controller 504 and configured to provide a signal to the telephone controller 504 indicative of whether the user associated with the telephone is determined to be present in a predetermined location of the vehicle, such that the telephone controller directs a received telephone call for the user to the telephone responsive to the signal. Exemplary user detectors include passive infrared detectors 52c and switching mechanisms 52a, 52b associated with a coupled seatbelt 523 or the user's presence in or near a seat 501.

Abstract: A lighting fixture with a motion detector is improved by incorporating an announcement device into the lighting fixture. The announcement device is a sound recording and playback device. When a person or an object enters into an area monitored by the motion detector, the motion will be detected by the motion detector. The motion detector will then turn on the lighting fixture and the announcement device to playback an announcement or a message through an amplifier and a speaker. The announcement can either be a prerecoreded announcement by manufacturer such as a warning to intruder, a welcome greeting to visitor or guest, a short tune of music etc. or a personalized announcement recorded by a user. In the first embodiment, the lighting fixture, motion detector and announcement device are assembled together within the lighting fixture body and formed integral parts of the lighting fixture.

Abstract: A security system for detecting the fracture of a pane of glass of a motor vehicle comprising a fracture detector mechanisms in the form of a resilient sealing member. The resilient sealing member, which is normally in physical contact with the glass, has at least one sensor integrally formed therein by molding the at least one sensor into the resilient sealing member. The electrical state of the at least one each sensor, which is monitored by a control mechanism, is changed when the glass is fractured and, upon fracture, an appropriate warning device is energized by the control mechanism in response thereto. An anti-trap device may also be included in the resilient sealing member in order to detect the presence of foreign objects.

Abstract: A small-sized alarm device is hung on a doorknob to emit an alarm sound upon detecting that a human body contacts or approaches the doorknob. The alarm device has data processor, such as a calculator and the like, in addition to an alarm and an electro-optic display for displaying data processed by the data processor and information related to the operation of the alarm. To the alarm device is rotatably mounted a hanging member for hanging the alarm device on a doorknob. The hanging member is fit into the case of the alarm device when in not use or is erected from the case when the alarm device is hung on the doorknob.

Abstract: An anti-theft device for electronic equipment mounted in a vehicle, such as audio systems, includes a housing for storing electronic component of the audio system and a detachable control panel that can be removed when the operator leaves the vehicle. A replacement detachable panel can be mounted on the housing to enable a locking of the housing to the vehicle dashboard. The second detachable panel can include an alarm, an ultrasonic sensing device, and a self-contained power source so that a security alarm system can be activated by the installation of the second detachable panel as a further deterrent to theft.

Abstract: A method of operating a system for monitoring the interior of a motor vehicle in which a rest signal amplitude is measured for the acoustic receiver or receivers in the absence of sound and is stored in memory while an actual reading is taken of the measured signal again in the absence of sound within the vehicle interior and this letter value is compared to the first and an error register is set if the measured value is outside a stored window.

Abstract: A flexible closure, for use in an alarm system is provided in which a conductive sensing element is interlaced with fiber matrix material to provide a network over at least part of the closure. The interlacing is preferably by means of knitting a conductive wire together with a yarn which forms the matrix of the closure. The closure may further include a protective outer layer on one or both faces of the closure.

Abstract: A multifunction visitor information system for use in association with a building structure including an electrical system, intercom system, door bell system, security system and telephone system, the apparatus comprising: a central control unit formed in a planar configuration with an essentially hollow interior, the control unit being couplable to a desired mounting surface, the control unit including at least one light, a liquid crystal display panel including means for displaying a plurality of different messages for viewing by visitors to a building structure, the liquid crystal display panel and each light being electrically coupled to the electrical system of a building structure; and a plurality of function buttons being positioned within the display unit and operatively coupled to the liquid crystal display panel, the function buttons permitting users to send a plurality of different coded sequences to the panel thereby causing different messages to be displayed on the panel.

Abstract: A motion sensor and photoelectric light sensor activated plug-in type electrical receptacle which conveniently plugs into a standard power outlet is disclosed. The device allows non-motion detector and/or non-photoelectric equipped devices to function as motion sensor and/or photoelectric sensor operated devices. The device has motion and photoelectric switches permitting customized applications. The device can be used with any wall or ceiling mounted electrical outlet to automatically turn on and off other plug-in type electrical devices such as night lights, radios, heaters, and thereof, when presence of people and/or pets is detected. This device conveniently plugs into any wall power outlet by means of two or three prongs without requiring new wiring or rewiring of the existing electric circuit.

Abstract: An automatic door answering and message system is disclosed. A preferred embodiment of the system has an interior unit and an exterior unit that communicate via an RF link. The system uses voice recognition and synthesis to interact with visitors. In addition to playing messages to and recording messages from visitors, the system also broadcasts to the inside their responses to predetermined queries, thereby permitting a resident to screen visitors in secret. Programmed dialogue scripts control the automated interaction between the machine and visitors. The system also has an intercom feature that enables the resident to talk with a visitor without opening the door. When the intercom is turned on, any automated dialogue script is interrupted. The system also includes a sensing means for sensing the open/closed state of the door, so that any automated dialogue script is interrupted by the opening of the door. Other embodiments include a telephone interface and a proximity sensor.

Abstract: Security systems which include an adjustable structure and a motion detector which detects changes in electromagnetic energy from within a zone of protection are described. The structure has a base for mounting the motion detector and wall members which extend away from the base and to form walls around the detector. The wall members are adjusted to positions between the plane of the base and planes perpendicular to the base to alter the shape of the zone of protection and conform it to the area or object of interest. The motion detector is electrically connected to a control unit and alarm module which includes a shock sensor and a current sensor. The motion detector and the control unit and alarm module are connected to a power supply and operated by remote control.

Abstract: A surveillance and alarm device for room spaces, comprising an infrared radar for controlling the lights as well as a fire and burglar alarm. A basic alarm is provided with a light controller to be connected in series with a ceiling light fixture in a room under surveillance, and is further provided with a microprocessor or some other intelligent control circuit, adapted to control the alarm actions of said device either on the basis of a command issued by a lamp light switch or a wireless remote controller or on the basis of a command issued by a key switch. The light controller included in the basic alarm switches on said lighting fixture as someone enters a room under surveillance or flashes said lighting fixture in connection with an alarm.

Abstract: A vehicle intruder detection system including at least one pressure operated switch which comprises a first, movable, conductive strip contact and a second, fixed, conductive strip contact. The second contact is attached to a fixed surface located within a vehicle interior so that the first contact is located in proximity, but not fixedly attached, to an internal face of a vehicle window. Each switch is connected into a circuit which incorporates an alarm, which is then triggered by application of a force to the external surface of a window sufficient to bring the first and second contacts together to close one of the switches.

Abstract: A device for supervising an area (16), in particular the crossing area between railway gates, in order to detect objects occurring in the area comprises a detector (18) adapted to transmit detection signals and receive their reflection caused by objects. The detector (18) is pivotably arranged in a reciprocal manner so as to transmit the detection signals in an angular area. The detector (18) may be a laser, the light of which forms the detection signals.

Abstract: A two wire detection device includes a relay switch setable to a high and a low impedance state and electrically coupled between a first terminal of an AC source and a first leg of a load, a second leg of which is connected to a second terminal of the AC source. The device includes an energy storage device electrically coupled to the first terminal of the AC source and electrically connected to the first leg of the load. Charge control means interposed between the first terminal of the AC source and the energy storage device regulate the voltage across the energy storage device. A detection control device is electrically connected across the energy storage device and to the switching device for detecting the presence of a condition for monitoring and setting the state of the switching device based thereon such that power is available to the detection control device regardless of the state of the switch.

Abstract: A method of supervising the operation of an intrusion detector having a housing, the method including periodically generating in the housing at least one sound wave signal, sensing an acoustic image formed in the housing in response to the at least one sound wave signal, constructing a sensed signal envelope responsive to the sensed acoustic image, periodically comparing the sensed signal envelope with a reference signal envelope to determine whether a predetermined criterion of similarity between the sensed signal envelope and the reference signal envelope is met and, if the similarity criterion is not met, providing a predetermined, sensible, indication.

Abstract: A portable, battery operated personal alarm and motion detector has two passive infrared (PIR) elements for sensing motion in two corresponding and oppositely directed fields of view, with each field of view being easily and selectably variable during set-up. A rotatable turret is associated with each PIR element and has several windows such that each window is selectably alignable with the PIR element by manual rotation of the turret. Each of the windows is provided with a lens or lens cluster which, when aligned with the PIR element, defines a different field of view in which motion is detectable by that element. An integrally and pivotally attached base member provides a support by which the device can be tilted to, and maintained in, a selectable orientation for purposes of aiming. Different modes of operation are selectable, including a manually armed alarm mode in which the person carrying the device only needs to depress a panic button in order for the device to emit a high decibel alarm.

Abstract: A device for controlling power to an electrical load. The device has two components: a portable desktop detector unit and an electrical powerstrip. The desktop detector detects the presence of a human in a room and sends signals to the powerstrip to supply power to or withhold power from individual electrical loads connected to the strip. Since the detector is portable, it can be positioned and repositioned at different locations in a room to maximize its ability to detect the presence of a person. The system can also communicate by wireless signals to a wall-mounted control unit to control light fixtures in the room. When used with a wall-mounted control unit, a photo sensor that detects the level of ambient light in a room allows the system to adjust the brightness of lights in the room depending upon the available ambient light level.

Abstract: A microwave intrusion detector is provided with a periodic signal detector that identifies periodic signals not typical of an intrusion and adjusts the alarm threshold in response such identification. The intrusion detector includes an adjustable threshold and a noise compensating circuit that actively adjusts the threshold at a first predetermined rate to mask background noise levels. The periodic signal detector modifies the adjustment, increasing the predetermined rate, when it detects a periodic signal typical of a motor, fan, florescent light or the like. The periodic signal detector also cancels or disables any pending or ongoing alarm to provide sufficient time for the threshold adjustments at the increased rate.

Abstract: A multisensor intrusion detection system having greatly improved immunity to false alarms is disclosed. This system employs a first sensor for sensing an intrusion in a volume of space by a first physical phenomenon and a second sensor for detecting an intrusion in the volume of space by a second physical phenomenon different from the first physical phenomenon. The first sensor generates a first signal in response to the detection of an intrusion into the volume of space, and the second sensor generates a second signal in response to a detection of an intrusion. A microcontroller generates an alarm signal upon the occurrence of one first signal and one second signal within a first interval, the occurrence of another first signal within a subsequent second interval and the occurrence of another second signal within a third subsequent interval.

Abstract: An intrusion detector system employing a remote, 360.degree. infrared detector. The system includes a base unit with a receiver, controller, and phone jack, a remote sensor which is adjustable along a vertical axis and includes a 360.degree. infrared motion sensor, and a central monitoring station in communication with the base unit via a telephone network. The remote sensor may be selectively positioned to detect movement in a surrounding area definable by the user. The base unit may be programmed to contact the monitoring station when the sensor detects motion, and also to receive test signals from the monitoring station and verify that the system is operational.

Abstract: A system for detecting the presence and passage of vehicle, pedestrian, or other intrusion and/or traffic within one or more monitored areas. The system detects intrusions of nontransparent objects which interrupt energy projections, records and stores data on certain characteristics of the intrusion(s), and transmits such data to a base station through a communication link. System estimates approximate size, speed and directional characteristics of intruding object(s) with an "expert system". Selected environmental data may be detected and transmitted along with intrusion data. Provision for photographing intruding objects is included. The base station provides user interfaces, processes intrusion data, reports activity, summarizes traffic data, prints reports and stores such data for future retrival. The intrusion detection system is based on energy projection, and does not require a physical presence such as air hoses, switches or inductive devices across the immediate span being monitored.

Abstract: A remote alert system includes an electrical signal transmitting unit located at a first location and a receiving unit located at a second location remote from the first location. The signal transmitting unit includes an electrical circuit either disposed in a module which fits between a light socket and a light bulb of a security light unit or integrated directly in the circuitry of the security light unit. The electrical circuit electrically interconnects the light socket with the light bulb so as to cause illumination of the light bulb in response to activation of the security light unit from an "off" to "on" condition. The electrical circuit also produces and broadcasts an electrical signal in response to such activation of the security light unit. The signal receiving unit includes a housing mountable at the second location and an electrical circuit disposed in the housing.

Abstract: A device for supplying power to and monitoring an electric fence, comprising a means connected to an energy source generating high-voltage pulses, a system for digital an electric quantity and a display device, and an alarm circuit.The digital system comprises a microprogrammed electronic integrated digital circuit which, by means of software, analyzes the status of the fence line and/or its degree of insulation on the basis of the data pertaining to the pulses transmitted along the fence line and/or the data relating to the return pulses sent by a transponder. The digitizing system then sends the results of these analyses to the display device, and transmits data to the alarm circuit via a data transmission channel comprising an electrical insulation.

Abstract: An electrical circuit for use in occupancy detectors for preventing false triggering when a load such as a light is de-energized. The occupancy detector includes circuitry for providing an intermediate signal indicating detection of a target object. An output stage receives the intermediate signal and in response provides a trigger signal for energizing the light or other load. An RC network, having a characteristic charge decay time, is coupled to the output stage such that the characteristic charge decay time governs the duration for which the output stage asserts the trigger signal for energizing the light or other load. Output signals from the occupancy-detecting circuitry are applied to the RC network through a first transistor switch. A second RC network, having its own characteristic charge decay time, is provided and the trigger signal is applied to charge the second RC network.

Abstract: Apparatus for detecting when birds are in a birdhouse with a heat sensor and illuminating a lamp to give a visual indication of the presence of the bird. A second portion of the circuit gives a visual indication when the bird enters or leaves the birdhouse.

Abstract: A multisensor intrusion detection system having greatly improved immunity to false alarms is disclosed. This system employs a first sensor for sensing an intrusion in a volume of space by a first physical phenomenon and a second sensor for detecting an intrusion in the volume of space by a second physical phenomenon different from the first physical phenomenon. The first sensor generates a first signal in response to the detection of an intrusion into the volume of space, and the second sensor generates a second signal in response to a detection of an intrusion. A microcontroller generates an alarm signal upon the occurrence of one first signal and one second signal within a first interval, the occurrence of another first signal within a subsequent second interval and the occurrence of another second signal within a third subsequent interval.

Abstract: An intrusion detection device of the dual sensing type has a PIR sensor to generate a PIR signal. The device also has a microwave sensor for generating a microwave amplitude signal. The microwave amplitude signal is filtered to generate a microwave high frequency signal which is the high frequency portion of the microwave amplitude signal. These three signals: PIR signal, microwave amplitude signal, and microwave high frequency signals are amplified and are digitized and are processed to generate an event signal. The event signal is compared to an event threshold signal and an alarm is generated in the event the event signal exceeds the event threshold signal. The event threshold signal represents the threshold to distinguish between a human intruder and an animal intruder.

Abstract: A system for detecting presences has modules or devices equipped with electronic circuits for the transmission and reception of binary messages by carrier current passing through the normal domestic electric network. The devices, connected to the electric network by an incorporated plug, are in addition equipped with actuators for the control (command) of the electric power equipment in order to intercommunicate at an equivalent rank level. This system consisting of an ensemble of several devices of the above-mentioned kind associated with devices having presence-detecting characteristics is capable of carrying out the function of an anti-intrusion alarm installation.

Abstract: An intrusion detector employing a remote, 360.degree. infrared detector. The detector includes a base unit with a receiver, controller, digital dialer and power supply plug, a remote sensor which is adjustable along a vertical axis and includes a 360.degree. infrared motion sensor, and a hand held remote control unit to arm and disarm the base unit. The remote sensor may be selectively positioned to detect movement in a surrounding area definable by the user.

Abstract: A sensing cable element including a non-uniform cable which is configured so as to substantially vary along its length in its ability to detect mechanical disturbances.

Abstract: A method and system is disclosed for indication and prevention of tampering with an electricity meter having control circuitry for automatic remote reading. The control circuitry, provided externally of the meter in a base or base extension, to which the meter is connected, is also used for tamper detection. Embodiments of the invention include use of optical sensing, voltage detection and proximity detection. Ambient light sensing may be performed to detect separation of the meter from the external receptacle. Reflected light to a reflective surface of the meter is sensed to determine if the meter is properly engaged. Presence of a meter connection plug element may be sensed either optically or by position responsive switch. Voltage of the utility supply and meter user output may be monitored to determine tampering.

Abstract: An alerting apparatus includes a pair of separate first and second lights capable of providing respective illuminations that are different from one another, an electrical power supply cord connected to the first and second lights for providing a supply of electrical power to activate the lights, and a motion detector connected to the electrical power supply cord and the first and second lights for activating the first and second lights for predetermined times in response to sensing motion in a predetermined area. The first light can provide a constant white illumination, while the second light can provide a flashing red illumination. Also, an alarm can be connected to the motion detector and the electrical power supply.

Abstract: A car security system has a proximity sensor such as a radar sensor with variable sensitivity and capable of producing a detection signal upon detecting motion of a person in a monitoring area. A control circuit is provided controls the sensitivity of said proximity sensor. The system also has a monitoring/alarming control circuit for control of predetermined monitoring and alarming control on the basis of the output from the proximity sensor, and alarming devices such as a headlight flash circuit, buzzer and siren for performing a predetermined alarming operation under the control of the monitoring/alarming control circuit. The sensitivity control circuit operates in response to a predetermined operation such as an arming start operation to vary the sensitivity of the proximity sensor so as to automatically set the sensitivity to a first sensitivity level which is the highest level within a range which does not cause the sensor to produce the detection output.

Abstract: A safety device which is responsive to excessive wave motion of a body of water includes a housing having a pivotable telescoping arm connected thereto. A pair of spaced apart probes are mounted on the end of the arm. The probes are connected to a control circuit located in the housing. The control circuit measures the electrical resistance between the two probes, which is normally an open circuit. In use, the arm is manipulated so as to position the probes a desired distance above the normal water level when no one is in the pool. Thus, the space separating the two probes is normally not bridged by water from the pool. When a person enters the pool, however, larger waves are created. These larger waves splash across the probes, bridging the space therebetween. As a result, the electrical resistance between the probes decreases. The control circuit is responsive to this change for generating an alarm. The safety device may also include a pressure responsive switch secured to a step of a ladder in the pool.

Abstract: An electronic security sentry for monitoring a designated area to detect unauthorized intruders comprises a housing that contains a microprocessor controller, a power source, and a two-way radio transmitter coupled to the microprocessor. The microprocessor controller includes storage for storing the digital equivalents of a predetermined set of verbal commands. A set of passive infrared detectors are coupled to the controller and mounted to the housing such that their fields of coverage span the area to be monitored. Upon detection by the sensors of an unauthorized intruder, a signal is conveyed to the microprocessor which selects a predetermined set of digitized verbal commands from its memory, activates the two-way radio in its transmit mode, and conveys the commands in a predetermined sequence to the two-way radio. The sequence of verbal commands are then transmitted by the radio for receipt by the security guards of an adjunct guard force, who can respond to the alarm accordingly.

Abstract: An improved dual sensor motion detection system is disclosed wherein the sensitivity of at least one of the sensors is adjusted in accordance with the response signals or signal history received from the sensors. This arrangement has application for systems having at least two sensors and simplifies installation and adjustment of the system.

Abstract: An intrusion detection system for a space secured in part by a deflectable physical barrier includes a cable sensor mounted on the barrier in such manner that it stretches and flexes in response to deflection of the barrier, thereby to produce an output signal representing such movement. A signal processor receives the signal from the coaxial cable and provides an output affirmative signal if the amplitude of the cable signal, within a predetermined frequency range lying below about 30 Hz, exceeds a predetermined level for a predetermined time interval.

Abstract: The apparatus of the invention includes a collapsible antenna for detecting the electric field associated with the individual. A current-to-voltage operational amplifier is coupled to the antenna. The amplifier includes an inverting input, a non-inverting input, and an output. A magnetic feedback path is provided for the amplifier. A magnetic filter is positioned between the amplifier output and the inverting input of the amplifier. An optical coupler is connected to the output of the amplifier. An intruder indicator, such as a signal display apparatus, a signal processor, or an audio indicator is connected to the optical coupler. The intruder indicator may simply provide a signal that an intruder is present or it may provide additional data defining the nature of the intruder.

Abstract: A system for detecting intrusion into a secured environment using both fixed and mobile intrusion detectors includes a multiplicity of fixed intrusion detection sensors are each deployed at specific, fixed locations within the environment. The mobile sensors are mounted on one or more mobile platforms which selectively patrol throughout the environment and may be rapidly deployed to any region in the environment where a fixed intrusion detector detects a possible intrusion. A computer receives the outputs of the fixed and mobile sensors and is communicatively coupled to the mobile platforms. The computer directs the mobile platforms to travel through the environment along paths calculated by the computer, calculates a sum of weighting factors associated with the output of each sensor, and fuses the sensor outputs so that the sum is uninfluenced by the traveling of the mobile platforms. The sum is compared to a reference whereby an output is provided when the sum exceeds the reference.

Abstract: An apparatus for detecting the presence of a person or persons inside a room having a door. The apparatus comprises a pyroelectric infrared sensor and a piezoelectric air pressure sensor. The infrared sensor detects movement of a person and produces a signal indicating the movement. The air pressure sensor detects opening and closing of the door and produces a signal indicating the opening and closing. A logic device including monostable multivibrators, AND gates, and an OR gate is connected between the outputs of the two sensors. When the signal indicating the movement is applied to the logic device later than the signal indicating the opening and closing, the logic device produces a signal indicating the entry of a person. When the signal indicating the opening and closing is applied to the logic device later than the signal indicating the movement, the logic device produces a signal indicating the exit of a person. These signals are processed by the logic device to know the presence or absence of a person.

Abstract: Device for fail-safe testing of a condition indicating device including at least one infrared sensor. The infrared sensor is connected by amplifiers to comparators which have different threshold values and have outputs connected to a microprocessor. An infrared signal transmitter is actuated by the microprocessor at periodic intervals to produce signals which are detectable by the infrared sensor. The microprocessor delivers an alarm signal if the test signal is not received by the infrared sensor within a specified period after triggering of the transmitter. The microprocessor also monitors the time occurrence of noise signals produced by the infrared sensor, and produces an alarm if no noise signals are received within a specified period. During monitoring of reception of transmitted test signals, monitoring of the noise signals is interrupted to prevent the test signal reception from being processed as a noise signal.

Abstract: Swim/sporting event timer/counter. A waterproof housing has upwardly projecting digital displays and two spaced ultrasonic receivers. A swimmer wears an ultrasonic transmitter tuned to ultrasonic receivers. by measuring the time differential for the ultrasonic signals from the transmitter to reach the receivers in the housing, the position of the swimmer (i.e., in front of, directly over, or behind the housing), is determined. Laps are identified by determining when the transmitted signal changes from being received by the two receivers by an increasing time differential to being received by a decreasing time differential. Each time the swimmer passes over the housing, the numbers on the display are inverted so that the swimmer may look down into the water and see the time regardless of which direction the swimmer is traveling in the lane or other predetermined course.

Abstract: A fluorescent lighting arrangement including a lamp controller for controlling the light intensity of fluorescent lamps in response to a motion detecting arrangement which receives its operating voltage from the lamp controller.

Abstract: Apparatus utilizing change in pressure condition in an area to be protected to indicate intrusion or change in conditions of the area by using a pressure detection device to detect pressure waves at low and infrasonic frequencies which includes a pressure transducer sensitive to change in pressure to provide an output signal. In some instances an amplifier is provided to amplify the output signal, a signal conditioning circuit is provided to delay a portion of the signal, and a detector device is provided to detect the signal with a comparator provided to compare the signal with the delayed signal and actuate an alarm..Iadd.Additionally, a device producing signals responsive to pressure waves and selected sonic frequencies is taught. If the signals are coincidently received at a coincidence detector, an alarm is activated. Further, the signals can be stretched and/or delayed before receipt at the coincidence detector. .Iaddend.