Abstract: An audio signal and a selected one of a plurality of sub-audio tones are transmitted to a plurality of receiving each being capable of being conditioned by first, second or third selected sub-audio tones so that either all receivers, or only a select group of all of the receivers or only an intended group are the receivers accept the transmitted audio signal, there being as many selectable second sub-audio signals as there are groups and as many selectable third sub-audio signals as there are receivers.

Abstract: A tag for use with an individual monitoring system. The tag is worn by an individual being monitored, preferably on the ankle or leg where it can be concealed by the clothing of the individual. The tag is fully self contained and sealed. The circuits of the tag periodically generate an identification signal that includes an identication code. The identification signal modulates a stable RF signal that is transmitted in bursts of data words to a receiver associated with a field monitoring device (FMD) located at the monitoring location. In turn, the FMD may randomly establish communication with a central processing unit (CPU) located at a central monitoring location. Other information is included in the identification code of the tag, such as information indicating that an attempt has been made to remove the tag from the individual. The tag is held in place near the skin of it's wearer by a conductive strap that wraps around the leg or other limb of the individual.

Abstract: The personal security system transmits a picture of an object, such as a criminal suspect, and the identification of a portable transmitter, such as the social security number of the user, to a receiver at a remote location. Time of transmission is recorded. If a crime occurs, the time, picture of the suspect, and identification of the victim are obtained from a recorder at the receiver. A potential victim of a crime points his portable personal security unit at a criminal suspect and presses an activating switch. The unit senses available light on the object and provides a flash if required. At the same time focusing an aperture control is performed and an image of the object is admitted to an image recorder which is a focal plane sensor array. Image data from the focal plane sensor array is processed in an image data processor and the processed image data is fed to a cellular communication transmitter for transmitting to the remote receiving station.

Abstract: A method for using an underground mine communication system to effect minewide communication and an intrinsically safe current limiter circuit for insuring that electrical equipment in the system will not cause incendiary conditions. The underground mine communication system comprises a plurality of repeaters and medium frequency radios, including, mobile, portable and personal-carried radios, inductively coupled to electrical conductors and natural waveguides existing in the earth by tuned loop antennas. Messages transmitted by the radios are carried to the repeaters by the conductors or coal seam waves. The repeaters amplify, replicate and retransmit the message at two different frequencies for transmission of the message to a surface base station and to other radios in the system. A paging system, which has a separate set of repeaters, is also coupled to the network of electrical conductors and natural waveguides by tuned loop antennas. The paging system alerts miners to contact the surface base station.

Abstract: The personal safety radio device is carried by the person to be protected on a mounting device, for instance incorporated in the heel of a work shoe, and includes a transmitter powered by a current source specific to the device, a receiver and an antenna arrangement. In order to ensure a high operational reliability and a long maintenance-free service life at a high range of transmission the device- specific current source is a rechargeable accumulator which may be charged by a generator arrangement including a piezo-electric converter during the operational useage of the device. The piezo-electric converter is so arranged in the work shoe that it is acted on by the weight of the person wearing the work shoe and thus converts the pressure of the weight into electrical energy.

Abstract: A technique for monitoring the reactions of a person exposed to a scene to determine the locations within such scene which attract the person's attention. A portable unit is mounted on the person's head by way of, for example, a set of earphones. A directional transmitter in the portable unit is aimed in the direction of the person's line of sight. Distributed throughout the scene are receivers located at selected points. When the person looks in the direction of one of these receivers, the emitted signal is detected by one of the receivers. An electronic memory stores the detected signal to indicate which of the receivers, and therefore which scene location, was being viewed.

Abstract: The invention is a circuit interception switch for an alarm transmission system, and an alarm transmission system having an alarm activating switch, a signal transmitter, and a circuit interception switch interposed therebetween, which alarm transmission system requires two closures of the alarm activating switch for energization of the signal transmitter, the first such closure energizing a device warning the user of such closure so that the system can be reset if such first closure was unintentional.

Abstract: A system for quadriplegics and for others having less than full use of their limbs for controlling the environment is disclosed. The system includes an intra-oral lingually operated switch located on a dental appliance. The switch activates an intra-oral power supply and intra-oral FM transmitter which directs control signals from the inside of the oral cavity to an external FM receiver. A controller responsive to the receiver generates output signals for operating call devices, and for controlling various appliances such as televisions, lights, bed position, etc. In one embodiment, a delay circuit is interposed between the intra-oral switch and the power supply such that inadvertent closure of the switch with the tongue does not cause undue power drain. An improved FM transmitter circuit is also disclosed which has low power drain, has low mass and temperature sensitivity and is not directional.

Abstract: In a computer system comprising a computer having a keyboard, and a display device connected to the computer, an improved position indicator means comprising a mouse having means responsive to movement thereof over a support surface for generating electrical signals indicating the positioning of the mouse, power source means carried by the mouse, circuit means powered by said power source means for generating and transmitting radio signals corresponding to said electrical signal, and processing means associated with said computer for receiving said radio signal and converting said radio signal into a display on said display device positioned corresponding to the positioning of said mouse.

Abstract: An alarm signalling method and system utilizing cross cueing between radio, audio and visible alarm signals which are emitted by an alarm signalling unit. A method and system for measuring the range between the alarm signalling unit and a receiver carried by a rescuer wherein the differences in the time of receipt at the receiver of simultaneously emitted radio and audio signals is used as a measure of range.

Abstract: A protective container assembly for receiver-speaker equipment including an outer container generally rectangular in configuration and closed along three sides and having a mouth at an end thereof with one side of the mouth extending beyond it as a flap member, the outer container being adapted to be secured to straps of a life vest, an inner container generally rectangular in configuration and closed along three sides and having a mouth at an end thereof, an equipment cover generally elongate in configuration and closed along longitudinal sides thereof with a large portion at one end and having a mouth at an opening in the end at the large portion, and separate Velcro strip closure means disposed across interior surfaces of the mouths of each of the outer container, the inner container and the cover. The outer container is sized to store the inner container and the cover within it.

Abstract: A system with pressure sensors (5, 12), transmitters (8, 16, 18) and receivers (10, 21) provided in running shoes (2, 3) that upon the shoes (2, 3) leaving or contacting the ground (14) emit and/or receive respective signals (S1, S2, S3, S4). Signals (S1, S2, S4) are formed which are received by a receiver (21) that is independent of the shoes and which are evaluated in an evaluation unit (23). The distance between the feet (FA) is determined from when a front striding foot hits the ground and the rear foot lifts off based upon the timing between the signals using an approximating formula. From the times and the stride length other values movement characteristics of the user may be determined as well.

Abstract: A system for monitoring the location of an individual is disclosed and includes a band to be strapped to the individual's wrist or ankle. A trigger, transmitter, and antenna are incorporated into the band. The trigger controls operation of the transmitter and activation is effected by a portable authority-retained control unit. The trigger deactivates the transmitter under predetermined conditions (such as removal of the band) and reactivation requires utilization of the control unit.

Abstract: A transmitter-receiver system comprises one single transmitter (1) and numerous receivers (6) mounted in a housing (9) having vertically stacked compartments (10) for the receivers (6) and an upper compartment (11) for the transmitter (1) so that the latter can permanently support the whole system on a user's body.

Abstract: A hand held remote control device having enhanced range capability includes a radio transmitter for transmitting encoded signals at a frequency between 1 MHz to 1 GHz, a battery and switch for energizing the transmitter, means for encoding and transmitting signals, and a housing, the improvement wherein said transmitter includes an open loop antenna connected to a conductive object that is exposed to the operator's touch on the outside of the housing.

Abstract: An alarm and communication system for water skiers as provided for use with a boat having a driver and a ski rope secured at one end to the back of the boat and a handle at the other end of the rope to which the skier holds, the system including a battery powered radio receiver positioned on the boat, the receiver having an antenna and being arranged to receive a pre-selected radio signal frequency, an alarm switch connected to the radio receiver to provide a closed contact in the absence of the reception by the receiver of a signal of pre-selected frequency and wattage, an alarm connected to the switch, and a radio transmitter, antenna and power source of a size to be supported above the water as a skier holds to a ski rope handle and is supported on the water surface when pulled by the boat, the transmitter antenna being arranged to transmit at the pre-selected frequency of the receiver and of selected wattage sufficient that when the skier is ahold of the ski rope handle and supported above the water surfa

Abstract: An externally connectable control unit for a portable radio includes an array of contacts matching a similar array of contacts on a portable radio. At lest one control switch is electrically connected with such connector contacts and disposed internally of a switch housing structure. The internal switch is located in association with a recess formed in the housing and a removable plug is friction-fitted within the recess so as to establish a first electrical condition of the control switch--but which is also capable of being manually pulled out of the recess to establish a second electrical condition of the control switch. The meaning to be associated with the switch is determined by a programming device in the control unit which interfaces with the portable radio circuits and is utilized to perform predetermined radio functions. One or more additional switches may also be located on the switch housing (e.g.

Abstract: A small-size transmitting apparatus for search and rescue operation (SARTR) adapted to be worn by a user for emitting a microwave rescue signal upon a marine accident involving the user. The SARTR includes a power supply, a transmitter unit energizable by the power supply and having a microwave oscillator, a transmitting antenna receiving of a microwave output from the transmitter unit for emitting the microwave rescue signal, a case accommodating the power supply, the transmitter unit, and the transmitting antenna and attachable directly to the user's body, or mountable on clothing or the like worn by the user for being carried thereby, and a switch unit mounted in the case for controlling the emission of the microwave rescue signal.

Abstract: A vehicular battery charger connects with a battery powered portable radio via plural electrical contacts including a so-called "universal device connector" (UDC). A battery contact interface is also provided. Battery charging current as well as auxiliary radio operating power is made available at the contact interfaces. In addition, the charger is capable of remotely controlling the modus operandi of the portable radio device so as, if desired, to convert the portable radio device to provide vehicular mobile or fixed base radio operations during the battery charging process. If such modified radio operation is desired, the battery charger detects current being drawn from the external radio power supply source (for supplying power to the radio operating circuits independently of the portable radio battery which is then being charged) and automatically reconfigures the portable radio device as needed to effect the vehicular mobile or fixed base operation.

Abstract: A method and device for measuring swimming technique utilizes a pressure transducer mounted to the hand of a swimmer. A measurement is taken of the pressure differential between the palm and the back of the swimmer's hand is measured during swimming and is plotted against time with the help of a microcomputer. An area under this curve is calculated and gives a measurement of the swimming effectiveness.

Abstract: A fabric headband which incorporates a replaceable thermal cartridge and is integrated with a miniature radio set whereby when the band is worn about the head as a crown, it then provides beneficial thermal effects as the wearer listens to the radio through a pair of earphones which depend from the crown. The headband is constituted by a central pouch adapted to receive both the cartridge and a flexible card in front thereof having a metallized face, and a pair of hollow fabric wings extending from opposite ends of the pouch. When the band is encircled about the head and the wings are joined to define the crown, the cartridge in the pouch then lies in heat-exchange relationship with the brow of the wearer.

Abstract: A device is disclosed for intraoral ambient sensing. In this embodiment, the device comprises a removable oral (Hawley) appliance containing a number of chemically sensitive electrodes and a common reference electrode at the chemical sensing sites and a telemetry unit plus power pack for signal transmission. This device may also be used to monitor non-chemical parameters, notably pressure, temperature, and flow. In this embodiment, the removable oral (Hawley) appliance contains a number of sensors to monitor the parameter of interest. For example, a pressure sensor configured as an artificial uvula and mounted to the oral (Hawley) appliance emulates actual uvula pressure events. To monitor chewing events, a pressure sensor is mounted to the oral (Hawley) appliance in such a manner that it is optimally located at an open bite location of the mouth. In either embodiment, a telemetry unit mounted to the oral (Hawley) appliance transmits the intraoral ambient information as radio frequency signal bursts.

Abstract: A compact and simple to operate transceiving device used by law enforcement officers, security agents, military personnel and the like to prerecord an emergency message prior to leaving his vehicle. In an emergency situation, the apparatus will automatically affect transmission of the above message to a central station if the user did not return to his vehicle in a preset amount of time.

Abstract: A system for quadriplegics and for others having less than full use of their limbs for controlling the environment is disclosed. The system includes an intra-oral lingually operated switch located on a dental appliance. The switch activates an intra-oral power supply and intra-oral FM transmitter which directs control signals from the inside of the oral cavity to an external FM receiver. A controller responsive to the receiver generates output signals for operating call devices, and for controlling various appliances such as televisions, lights, bed position, etc. In one embodiment, a delay circuit is interposed between the intra-oral switch and the power supply such that inadvertent closure of the switch with the tongue does not cause undue power drain. An improved FM transmitter circuit is also disclosed which has low power drain, has low mass and temperature sensitivity and is not directional.

Abstract: A warning device particularly for use in a coverall worn by a person in a controlled environment warns if the person has unfastened the garment. The garment has fasteners such as a zipper for opening and closing the garment. A pair of electrical contacts are mounted in the zipper track for contact by the zipper head as the zipper head moves along the zipper track. The zipper head establishes continuity through the contacts as it is drawn past. This provides a signal to a transmitter mounted to the coveralls. The transmitter provides a radio frequency signal to a receiver located in a monitoring area. The receiver provides a warning upon reception of the signal.

Abstract: A display device for electrical equipment includes a casing for the equipment, a transparent plate mounted in the casing, a display panel positioned in the casing inwardly of the transparent plate, a single resilient connector received in a recess formed in the casing, and a printed board securedly held in the casing by means of fastening members. The display panel is disposed adjacent an end of the printed board and extends in the direction perpendicular to the plane of the printed board. The resilient connector serves to electrically connect the printed board to the display panel and has an elongated rod shape and a channel-shaped cross-section.

Abstract: A self-contained, fully operational radio device adapted in size and configuration for implacement and retention at the entrance to an ear canal, said device being fully self-supported by surrounding ear cartilage, thereby eliminating any need for connecting wires or other radio circuitry. The device includes a casement having an outward and an inward housing for containing the respective radio circuitry and speaker means for the radio device. A battery is also contained within the outward housing for powering the radio system. The maximum outside dimensions of the radio device and enclosed radio circuitry are less than 3/4 of an inch in diameter and one inch in length. Various functional controls are provided for convenient operation of on/off, frequency selection, and volume level.

Abstract: The present invention provides a small portable radio transmitter unit which can be worn on the wrist or suspended from a neck chain to provide immediate access in the event of an emergency condition and without interfering with the normal day-to-day activities of the wearer. The unit is contained within a watertight housing having a resilient membrane depressible by finger pressure to actuate a button switch within the housing for actuation of the transmitter. The housing is vented to the atmosphere to provide equalization of internal and ambient pressure in a manner providing isolation from water or other liquid entry to thereby maintain a watertight enclosure.

Abstract: A short range, low power, radio wave transmitter which acts as a miner locator. The transmitter is incorporated with the cap lamp circuitry for the miner. It utilizes the same self-contained power source and its wire connection thereto acts as the transmitter's antenna. No action on the miner's part is necessary in order to begin the transmission which may be on a specific identifying frequency for each miner. An electronic crowbar circuit may be used to conserve power for the transmitter by cutting off power to the cap lamp should the voltage across the self-contained power source fall below a preset level. This enables the transmitter to function for several days by reducing the load on the power source.

Abstract: An emergency signalling unit which is designed to be carried on the person of a fireman or other worker to alert control personnel should the worker become endangered, and an alarm system which incorporates a plurality of such signalling units, each one worn by a different fireman, for providing an alarm at a central station and an indication of which fireman is in trouble, as well as a means of locating him. The emergency signalling unit includes a radio transmitter, a high intensity strobe lamp, and an audio frequency generator. The alarm system includes a plurality of the above-mentioned radio transmitters, each transmitting on a different carrier frequency, and a receiver at a central control station exterior to the burning building, which is equipped to identify the respective carrier signals and to provide a visual indication of which fireman is in trouble as well as an audible signal to alert control personnel to the existence of an alarm condition.

Abstract: The present invention relates to a radio signals transmitter.The transmitter according to the invention comprises a pulse train generator including a quartz oscillator, generating a high frequency signal which is provided to a transistor 7 controlled by the charge and the discharge of a condensor 5 acting on the voltage of its base. A train of A.C. frequency pulses is thereby produced.The generator is protected by a housing which is worn around the neck of the user by means of a chain forming a quarter wavelength antenna.The present invention is used as a portable distress signals transmitter for isolated persons, such as skiers, mountaineers or other people in difficulty.

Abstract: An audio system for portable high fidelity reproduction, to provide a sensation of being surrounded by a three-dimensional field of lifelike sound events, comprises a set of miniaturized electro-acoustical devices adapted to each other and for battery-operated high fidelity reproductions and designed to be supported by or built into an interconnecting belt-like garment, so as to be worn in contact with the listener's body without causing any discomfort or encumbrance. The system may further employ one or more pairs of small-size binaural transducers with open-air high fidelity characteristics, and its circuitry is designed for binaural radiation and for optimal frequency response and perfect space reproduction through a given transducer type.

Abstract: Emergency information communicating device is disclosed having a wireless transmission circuit, a switch means and a battery which are provided in a waterproof case body, a permanent magnet inserted in a slot defined in the case body for providing a magnetic field to actuate the switch means and an electrical conducting member acting as an antenna. By disengaging the permanent magnet from the case body, emergency information can be radiated from the antenna.

Abstract: A teaching apparatus including a transmitter portion, a receiver portion and a prompter portion, each of the portions being disposed in a separate self-contained unit, the transmitter portion being adapted to be worn on the head and including a peripheral band portion and a top connecting portion extending in an arcuate path between opposing sides of the peripheral band, a microphone disposed on the under side of the connecting portion intermediate the ends thereof for contact with the head, an antenna associated with the peripheral band portion, citizen's band transmitter mechanism located on the connecting portion, power supply member connected to the transmitter member, voice activatible actuating member connected to the transmitter member; the receiver portion being adapted to be worn on the head and including a peripheral band portion, transducer member disposed on the inside of the peripheral band portion, citizen's band receiver member connected to the transducer member, power supply member connected t

Abstract: A wireless transmitting and receiving system includes an ear microphone of the vibration pick-up type for picking up bone-conducted voice signals through an external auditory ear canal wall of a wearer. A portable case is disposed adjacent the wearer's ear and a wireless device is attached adjacent the wearer but spaced from the portable case. A transmitter of a transmitting circuit for transmitting the output signals of the ear microphone is housed in the portable case. A receiver of a receiving circuit is housed in the wireless device and receives signals from outside the system. The transmitting and receiving circuits provide a wireless connection between the portable case and the wireless device permitting two-way communication through one ear of the wearer.

Abstract: There is disclosed a miniature hand-held radio-frequency transmitter. An operating frequency is determined by a lumped-circuit oscillator which feeds an antenna etched on the periphery of the circuit board. The antenna is tuned to a frequency which is slightly above the second harmonic of the operating frequency, it being the second harmonic which is radiated. By slightly mis-tuning the antenna, the effects of an enveloping hand are minimized. The clasping of the transmitter by a human hand results in the absorption of some of the radiated power, but hand-capacitance effects also shift the center frequency of the antenna characteristic toward the second harmonic of the operating frequency, thus increasing the radiated power. In this way the signaling range under free-space conditions is the same as that under operating conditions. The oscillator circuit can thus be adjusted for maximum power output under free-space conditions within the guidelines of F.C.C.

Abstract: A system to automatically control the changeover of recording and recording stop, or transmission and transmission stop, and being employed in the recording or transmitting device provided with a vibration pick-up type microphone for picking up bone-conducted voice sounds. The automatic changeover of recording and recording stop or transmission and transmission stop is attained by control signals corresponding to impact vibrations except voice signals uttered by a microphone wearer himself, transmitted through his bones and picked up by the microphone or another controlling microphone.

Abstract: A concealable signaling, e.g., radio alarm, device worn on the person and actuated by concealed switch means that include mechanical detents. The engagement of the detents provides secret tactile information back to the wearer. The presently preferred embodiment is a miniature radio alarm transmitter concealed in a device which also serves as a belt buckle. The wearer distends his waist to actuate the transmitter. Tension in the belt moves an element through one or more detent engagements before it activates the transmitter. These detent engagements make transient changes in the belt tension which are felt by the wearer; these inform the wearer of impending activation, so preventing false transmitter signals or alarms.

Abstract: A location transmitting system for use by one or more guards in a security system. Encoders are located at predetermined reporting locations which have no power supplies. Each guard carries a walkie-talkie radio transmitter which he places in a receptacle at the reporting location, energizing the encoder through external terminals in the receptacle which mate with external terminals of the walkie-talkie and its power supply.

Abstract: An alarm activating device is provided for closing a normally open circuit upon release of body pressure upon the rearward wall of the device, comprising a first, second, and third plate supported respectively in substantially parallel alignment behind a mounting plate, which mounting plate is adapted to be secured behind a belt in close proximity to a body, the first and third plates being spaced-apart and movable together from a position wherein one contacts the second plate, to a position where the other contacts the second plate, including means for applying constant positive pressure to the first plate opposite the second plate, and further including a first and a second contact in series circuit relationship, supported adjacent one another in alignment on the first and second plates.

Abstract: Method for repelling sharks and the like by creating an electric field containing a zone about an anode and/or cathode electrodes submersed in salt water. A voltage gradient of sufficient magnitude to overstimulate the nervous system of a shark has been found. The applied voltage is insufficient to disturb most scaled fish and man. The electric field is determined by considering the free space solutions of Maxwell's electro-magnetic field equations. The d.c. square wave potential is applied to the electrodes for that period of time wherein electron flow from cathode to anode is continued. The square wave potential is maintained only long enough to allow nervecell response in a shark. It is turned on with a frequency near a shark's nervous system's normal frequency.