Abstract: An electronic paging receiver for reminding a user of an important event includes a time of day clock for recording the time when a data message is received. The paging receiver computes a future alert time to remind the user of the receipt of the data message. Additionally, the user may enter a future alert time to generate a future alert. Further, the paging receiver is capable of detecting a special time/date field in the received data message to automatically generate a future alert.

Abstract: The plural source arbitration system relates generally to communications systems for linking peripheral devices to a computer. Specifically, the arbitration system allows an external keyboard and a remote control device to be intercoupled to the keyboard slot of a computer and carry out communications without confusion.

Abstract: An electronic security device has at least one lock and a control center for generating keys to the lock. When a new key is generated, a new (second) combination is generated by applying a predetermined algorithm and randomly generated (first) calculation data to the previous (first) combination. To calculate a next new (third) combination, another randomly generated (second) calculation data is applied to the second combination using the same algorithm. The control center stores, on the key, the third combination, and the second calculation data used to obtain it and the first calculation data used to obtain the second combination. At the lock, the third combination is compared with a stored combination and if there is no match, the lock calculates a possible second combination by applying an algorithm, which is the inverse of the predetermined algorithm, to the stored combination using the second calculation data read from the key.

Abstract: A paging receiver is capable of receiving message data. The receiver includes a data set and a hold circuit, the output logic of which is inverted in response to the detection of a control signal which follows a paging number individually assigned to that receiver. The receiver is inhibited and excluded from or enabled and restored into a data service which is provided in response to a common or group call number for paging many and unspecified receivers. The inhibit or enable signal is provided by the output of the data set and hold circuit. The data set and hold circuit are powered by a power source which is different from a main power source of the receiver. The receiver determines whether or not the power source associated with the data set and hold circuit is present and, if it is not present, the receipt of the data service based on the common number is inhibited.

Abstract: An electronic key which responds to different sets of valid commands over its lifetime, depending on the state of certain circuits within the electronic key,(1) After initial fabrication of the electronic key, the electronic key recognizes a first set of valid commands and ignores all other commands,(2) After the electronic key is tested and a countdown circuit within the electronic key has been calibrated, a fusing element inside the electronic key is blown. This reduces the number of valid commands recognizable by the electronic key. Thus, the key is now restricted to a second set of valid commands,(3) The electronic key is then shipped to an OEM, who programs data into the key and also programs the length of time of the countdown timer. The OEM then sets an R-S flip-flop in the electronic key, which causes certain of the second set of commands to be ignored. Thus, the key will now respond only to a third set of valid commands,(4) The electronic key is then shipped to an end user.

Abstract: A paging system is provided for transferring information to a paging receiver. The system includes a central controller having a paging controller, an encoder, and a first transmitter. The paging controller receives the information and data designating the paging receiver from an entry device. The encoder, in response to the data, generates a selective call paging signal designating the paging receiver. The selective call paging signal is transmitted to the paging receiver by the first transmitter. The paging receiver receives and decodes the selective call paging signal generating a control signal. A switching device is provided for selecting a normal and a deferred paging operating mode. In response to the control signal, a coded acknowledgment signal is generated indicating the selected paging receiver mode, and transmitted back to the paging controller by a second transmitter included in the paging receiver.

Abstract: A paging network is disclosed which utilizes a plurality of distributed switches to transmit pages on a non-real time basis to achieve efficient and low cost transmission. Each of the switches processes packets of pages received from the network. Each of the switches also processes pages into packets of pages to be transmitted to another switch in the network or into batches of pages to be transmitted by a local paging service if the switch is a local switch. The network dynamically programs the reception channel of the paging receivers in response to traffic conditions of a local switch or in accordance with service options specified by a subscriber to a local paging service. The digits of the paging receiver identification code are transmitted in an order of increasing significance to conserve battery life of the paging receivers. Pages may be initiated by placing a local call to any lata switch in the network and service options may be varied by placing of a local call to a lata switch.

Abstract: A paging network is disclosed which utilizes a plurality of distributed switches to transmit pages on a non-real time basis to achieve efficient and low cost transmission. Each of the switches processes packets of pages received from the network. Each of the switches also processes pages into packets of pages to be transmitted to another switch in the network or into batches of pages to be transmitted by a local paging service if the switch is a local switch. The network dynamically programs the reception channel(s) of the paging receivers in response to traffic conditions of a local switch or in accordance with service options specified by a subscriber to a local paging service. The digits of the paging receiver identification code are transmitted in an order of increasing significance to conserve battery life of the paging receivers. Pages may be initiated by placing a local call to any lata switch in the network and service options may be varied by placing of a local call to a lata switch.

Abstract: A paging network is disclosed which utilizes a plurality of distributed switches to transmit pages on a non-real time basis to achieve efficient and low cost transmission. Each of the switches processes packets of pages received from the network. Each of the switches also processes pages into packets of pages to be transmitted to another switch in the network or into batches of pages to be transmitted by a local paging service if the switch is a local switch. The network dynamically programs the reception channel(s) of the paging receivers in response to traffic conditons of a local switch or in accordance with service options specificed by a subscriber to a local paging service. The digits of the paging receiver identification code are transmitted in an order of increasing significance to conserve battery life of the paging receivers. Pages may be initiated by placing a local call to any lata switch in the network and service options may be varied by placing of a local call to a lata switch.

Abstract: A remote control device has a transmitter provided with a transmission circuit for producing a remote control signal, a first capacitor of small capacity upon discharging to drive the transmission circuit, a second capacitor of large capacity upon discharging to charge the first capacitor, and a pair of terminals for charging the second capacitor from the outside of the transmitter.

Abstract: An identification system, consisting of at least one stationary element and at least one movable element or token, the first element having a first induction coil adapted to generate a magnetic alternating field and being connected to a source of alternating current, and to a detector for detecting variations of the electromagnetic field, the detector being adapted to compare the detected patterns, the second element having a second induction coil adapted to pick up the field of the first coil and being connected to a rectifier circuit adapted to rectify the induction voltage of the second coil, a capacitive storage device being provided for smoothing the rectified voltage, a control circuit being fed by the rectified voltage and receiving, at an input terminal, the ac voltage induced in the second coil, the control circuit having an encoding deive adapted to produce, at an output terminal, code signals identifying the second element, these code signals being used for actuating a switch which, in one conditio

Abstract: A digital selective call receiver is modified to enhance the address decoding capability by providing access to received data, bit and frame synchronization signals, and a detect input terminal of an annunciator. A selectively attachable additional independent address decoding device including additional memory and an independent address decoder operating in parallel with the decoder in the selective call receiver is attached to the receiver for accessing the various signals and providing a detect signal to the annunicator when an additional independent address is decoded.

Abstract: An intelligent security assessment system includes a multiplicity of sens for detecting intrusion into an area. Each of the sensors operates on a different principle to detect intrusion. For example, sound, vibration, infrared, microwave and light level sensors are used. A computing system receives the outputs of each of the sensors and is programmed to provide an output based upon an algorithm that minimizes the likelihood of a false indication of intrusion by the intrusion sensors. Each sensor has an on and an off state and the computing system assigns a weighting factor for each sensor that is in the on state. The computing system sums the weighting factors and compares this sum to a reference and then provides a further output when the sum exceeds the reference. This computing system output is utilized to activate an additional intrusion detector such as an ultrasonic detection system and also to activate a video surveillance camera for observance of the area where the intrusion is indicated.

Abstract: A system for identifying an individual includes a graspable member and a plurality of pressure sensors at preselected locations on the graspable member for developing a uniquely identifying signal or print indicative of the pressures exerted by an individual's hand in grasping the graspable member. Additional structure is provided for storing a plurality of such pressure indicative signals and for comparing the stored signals against later acquired signals in order to verify the identity of an individual.

Abstract: An independent transmitter/receiver, or a transponder in a communication system, receives signals distorted by outside, unwanted conditions such as noise, line capacitance, and so forth. The status of a switch is checked at periodic times, by pulsing, rather than by continuous current flow, to conserve power. The invention includes a debounce circuit for monitoring the switch status; the debounce circuit is adjusted by a debounce select signal received from outside the transmitter/receiver. In addition a sensing circuit is coupled between the switch being monitored and the debounce circuit. The sensing circuit also has its sensing operation adjusted as a function of the debounce select signal. This allows for accurate monitoring of the switch condition, notwithstanding noise, line capacitance and other factors.

Abstract: A paging device includes a radio receiver (10-20) and decoding circuitry (22) for receiving an encoded transmitted signal and operates an indicator (26) to alert a user that a call has been received. A signal strength detector (30) monitors the strength of a carrier for a transmitted signal and provides a voltage level proportional to the carrier signal strength. A switch (33), when enabled, connects the voltage level from the detector (30) to a voltage controlled oscillator (32) which provides an output having a frequency proportional to the monitored strength of the carrier signal. The output of the variable frequency oscillator (32) is connected to the indicator (26) to provide the user with an indication of whether transmissions may be reliably received.