Abstract: Mechanical coupling apparatus for a position locating system comprises a force sensing device (504). One extremity of the coupling apparatus is joined to a rigid body (506) which may be fixed. A plate or a visual display screen (501) having a surface (501a or 501b) exposed to the application of a localized force is joined to the other extremity of the coupling apparatus. The force sensing device senses force changes which are proportionately related to the localized force (F) applied to the exposed surface of the plate or visual display screen. The force is sensed through a predetermined point of action (510) of the coupling apparatus. In order to decrease error, the point of action (510) is in substantially the same plane as the exposed surface of the plate or screen. The coupling apparatus provides support to the plate or screen (501) without creating any undesirable moments.

Abstract: A circuit which can perform a plurality of sensor functions relating to telephone subscriber supervisory circuits. These functions can occur before and after ringing current is applied to the subscriber line facility. Coils function as magnetic field generating devices and a Hall effect device is used to perform the sensory functions. A programmable comparator is used to compare detected conditions with predetermined thresholds.

Abstract: An electronic identification system for reading a pre-defined identifier code. A preferred application provides a credit card sized "identifier" which includes an array of electrical inductors, some of which are electrically connected in a selected pattern to define the identifier code. The identifier may be positioned closely proximate to a substantially identical inductor array included in a "reader" so that each identifier inductor is centered over a corresponding reader inductor. An alternating current is applied to each reader inductor in turn to induce an electromagnetic field in the region surrounding the driven inductor. The electromagnetic field so produced induces a voltage across the identifier inductor centered over the driven reader inductor. If that identifier inductor is electrically connected to another identifier inductor(s) a current will flow in the other inductor(s) and a second electromagnetic field will be generated in the region(s) surrounding the connected inductor(s).

Abstract: The invention relates to apparatus for use in printing devices for the deposit of sheet-type recording media transported across a platen into a deposit tray area disposed above the platen. Deposit of the sheets is carried out by means of transport or delivery rollers which seize each sheet after it has passed through a printing area adjacent the platen and lift the sheet over a lower edge of the deposit tray for stacking. A pivotally mounted common carrier bracket is provided to carry a support wall which forms the lower edge surface of the deposit tray and the transport roller means. The support wall has a stripper surface formed along one end thereof containing bias means for resiliently pressing the recording medium into driving engagement against the transport rollers. The other end of the support wall is formed with intake guide surfaces for leading sheets into engagement with the intake side of the platen.

Abstract: A computer-communications concentrator for establishing connections between a plurality of asynchronous computer-communications terminals and a two-way computer-communications channel for transmission and switching of packetized data. The concentrator is comprised of one processing unit which is operated asynchronously and is connected to the computer-communications terminals. One X25 interface normalizing function processing unit is connected to the two-way computer-communication channel, with, between the two processing units, a communication system comprised of one memory unit having a first part in which each packet transmitted in one or the other direction is stored, and a second part comprised of forward and return cell pairs.

Abstract: An array of individually controllable conductors presents variable data as a magnetic flux pattern that can be scanned by equipment presently used to scan prerecorded magnetic strips.

Abstract: Radio signals from at least one Navy Navigation Satellite are received and an accurately timed signal is extracted therefrom. The special signal is used as a synchronizing signal to synchronize the flashing of a plurality of navigation lights. Each navigation light receives the radio signal, extracts the special signal and generates a flash signal which is used to flash a lamp.

Abstract: A status reporting arrangement for a digital transmission system (10) has a plurality of stations (11, 12, 13) in a tandem configuration. Each station (such as 11) includes a reporting circuit (30) arranged for receiving (36) a train of messages (91, 96), each message originating from a different preceding station (such as 13 and 12) in the tandem configuration, followed by a received caboose signal (97). Each reporting circuit responds in turn to the train of messages and the received caboose signal by retransmitting (60) the train of messages (91, 96) but deletes the received caboose signal (97). The reporting circuit, in response to detection of the received caboose signal, appends to the retransmitted train of messages a message (100) from the local station and a new caboose signal (102).

Abstract: A digital radio paging communication system has a transmitter and a plurality of receivers. The receivers are energized intermittently to save battery power. The transmitter generates a preamble signal, a synchronization signal, a plurality of calling signals and a stabilization signal, which are arranged into a sequence of signals including two of the preamble signals separated by a measured time interval and at least one batch signal including the synchronization signal and the plurality of calling signals which are divided into a plurality of groups. Each group of calling signals have a stabilization signal at the leading portion thereof followed by a receiver identifying code. A carrier wave is modulated with the sequence of signals and then transmitted. Each of the receivers receives and demodulates the carrier wave. Responsive to the receipt of a first preamble signal, the receiver switches from intermittent to continuous power at an intermediate stand-by level.

Abstract: A tire pressure monitoring system includes a tuned circuit with a pressure sensitive switch which is closed when the tire pressure is normal, connected across it, the tuned circuit and switch being mounted on the vehicle wheel. Mounted on a part of the vehicle is a detector circuit including an oscillator which includes an inductor which is at least intermittently coupled to the inductor of the tuned circuit. When the switch is closed the oscillator runs normally and its output is detected to indicate that all is well. When switch is open, however, the oscillator output is suppressed whenever the inductors are coupled together. The circuit can also be used in other applications where it is required to detect the state of an isolated switch.

Abstract: A varying impedance line test termination device for providing a characteristic signature to the telephone central office when a continuity test is made on a subscriber line having a pair of electrically conductive paths includes a first current path having a first resistor and a capacitor connected in series across the electrically conductive line paths and a second current path having a diode and a voltage breakover device connected in series across the capacitor. If the voltage breakover device is capable of emitting light, a flashing indication will be provided when the subscriber line is being interrogated.

Abstract: A signal lamp apparatus with a lamp burnout detecting circuit has a right turn signal lamp group and a left turn signal lamp group which are connected to a power source through a turn signal switch and a relay contact coupled in parallel with a burnout detecting resistor. Each of the lamp groups includes a plurality of signal lamps connected in parallel with one another. The apparatus includes a comparator which produces an output signal when the voltage across the signal lamp group is higher than a predetermined voltage, and a device which produces a burnout signal when the comparator has an output signal after lights-out, for example, after 20 to 100 m sec since the relay contact is opened. With such an arrangement, the burnout of the signal lamp or lamps may be detected while the signal light lamp group is flashing.

Abstract: A plurality of fire, smoke, security or other detectors of the type which respond to the existence of a predetermined condition are each connected to an input circuit. Each input circuit is connected to one indicator circuit and when a detector is triggered, the input circuit associated with that detector generates a signal which in turn actuates and latches on the corresponding indicator circuit. The indicator circuit remains latched on even after the detector returns to an untriggered condition and the input circuit signal is removed. A first release circuit is provided to release all indicator circuits which have been latched on. When a predetermined number of detectors simultaneously respond to their respective predetermined conditions, an alarm signal generates an input to by-pass the first release circuit, thus precluding the first release circuit from releasing the plurality of indicator circuits.

Abstract: Each arm forming a three-phase full wave rectifier bridge includes a semiconductor diode, a current transformer and a fuse. The current transformer is connected to a pulse extinction indicator circuit through a pulse transformer. When no current flows through the arm for a predetermined time or more, the pulse extinction detection circuit produces a DC signal indicating the blowing of the fuse. The rectifier bridge, the current transformers, the fuses and the pulse extinction detection circuit are all disposed on the rotor of a brushless synchronous machine.

Abstract: A system for measuring the attenuation on a transmission path for a random signal in which the propagation time of said signal is between a lower limit T1 and an upper limit T2, the system comprising:a first maximum value indicator circuit with immediate response and a holding time not less than T2, to which the signal at the input end of said path is applied;a second maximum value indicator circuit with immediate response and a holding time not less than T2-T1, to which the signal at the output end of said path is applied;a detector which detects that the output of said first indicator has been maintained constant during a time interval not less than T2, connected to receive the output signal from said first indicator and determining times at which the indicator output signals are recognized; anda processor connected to receive the indicator output signals, controlled by said detector and generating a measurement signal which is a function of the instantaneous value of the ratio of the indicator output signa

Abstract: A device for measuring microphone sensitivity and droop by subjecting the microphone to a negative step function input and recording the microphone electrical response thereto. The microphone is surrounded by an inflated thin, flexible, expandable membrane. The membrane is ruptured resulting in an instantaneous reduction in air pressure on the microphone. It is this instantaneous reduction in air pressure that constitutes the negative step function input to the microphone.

Abstract: In an electric alarm device, a disk-shape housing has an opening on one surface and a substantially flat bottom surface on the other surface. A diaphragm is fixed to the periphery of the housing to close the opening of the housing. An armature is mounted within the housing and coupled to the diaphragm to move with the diaphragm. A solenoid coil unit is fixed to the housing within the housing to generate magnetic fluxes for attracting the armature. A switch is mounted within the housing to detect the movement of the diaphragm to conduct and break the current to the solenoid coil unit.

Abstract: An interface for synchronizing the output of standard asynchronous terminals with a PABX allows all terminals to operate asynchronously with respect to each other. The output from the I/O terminal, which comprises a binary data stream in an asynchronous code, is sampled at a rate of at least three times greater than the output bit rate of the terminal. A clock signal to effect the sampling is generated within the PABX. The sampled data appears to the PABX as a bit stream synchronized with the PABX clock, allowing direct application of the sampled data to the PABX. The receiving terminal, upon reception of a start bit, waits one-half time (of its own clock) and samples the received data to reconstruct the received bits into corresponding alphanumeric characters. The frequency of the clocks internal to each terminal may vary within one percent of each other before requiring each terminal to be synchronized with each other.

Abstract: An acoustical analyzer system analyzes the operating characteristics of an acoustical device by operator selection of frequencies and amplitudes of test tone signals, automatically generating test tone signals representative of the selected frequencies and amplitudes and driving the acoustical device thereby to produce output signals from the device, sampling the output signals, generating sampled signals representative of the output signals, applying Fast Fourier Transform analysis to the sampled signals to generate readout signals therefrom and operating readout means via the readout signals to display the operating characteristics of the device.

Abstract: An improved method for controlling a drawing machine of the type that is connected to a computer by means of a digitizing device, and comprises a sensor plate and sensor. The method comprises the steps of horizontally projecting an image, from the drawing table surface, through the back side of a translucent sensor plate, and thereby reproducing said image conformably upon the front side thereof as a drawing field, which thereby comprises a screen upon which a digitizing sensor is operable to be employed. There is also taught an important device for controlling a drawing machine of the type that is connected to a computer by means of a sensor plate, containing therewithin a sensor field track, for sensing the position of an associated sensor. The improved device comprises a projector that is adapted to focus an image from a drawing table surface upon a drawing field surface of a sensor plate which is translucent, and contains the sensor field track.