Abstract: A current injection compensation circuit for dynamically compensating for the effect of ambient conditions on phototransistor output is disclosed. An output voltage is maintained at a nominal reference voltage level independent of ambient light input to allow use of a large output for a detected signal. Phototransistor current is a function only of ambient conditions, especially incident ambient light and is unaffected by compensation current injection. The ambient compensation current injection network can be employed with interactive touch input devices, such as infrared touch entry systems used with video displays.

Abstract: A receiver for receiving a reception signal defining a measured value is connected to a two-wire transmission line used for transmitting a digital command signal from a communicator, a digital measured value signal from a transmitter, and a response signal responding to the command signal. The receiver includes a timer for discriminating that a nonsignalling state of the two-wire transmission line has continued for a predetermined period, and a CPU for validating a specific period of a reception signal received after the discrimination operation of the timer.

Abstract: When excessive acceleration slip of a driving wheel is detected by wheel speed sensors attached to driving and non-driving wheels, an electronic control unit provides first and second control signals to a change-over valve and a control valve, respectively. The change-over valve operates in accordance with the first control signal to supply hydraulic pressure from a hydraulic pump to control a cut-off valve to thereby cut off communication between a master cylinder and a wheel cylinder. At the same time, hydraulic pressure from the hydraulic pump is fed to the wheel cylinder through the change-over valve and the control valve to brake the driving wheel. The control valve operates in accordance with the second control signal to increase or decrease the pressure in the wheel cylinder thereby adjusting the braking force for the driving wheel.

Abstract: In a communication system having a communication channel for transmitting data between a base station and a plurality of mobile radio units, wherein each radio unit has a unique identification (ID) code and wherein transmissions from each radio unit to the base station include the unit's ID code, a method is described for identifying which units are within RF communication proximity of the base station. The method includes: transmitting a range message, including a low ID code parameter and a high ID code parameter, from the base station over the channel to elicit a response from at least one of the mobile radio units having an ID code between the low and high parameters; determining whether radio units transmitted a message in response to the range message; and storing, responsive to transmission by the units, in an ID list a signal representative of the respective ID code assigned to such transmitting units.

Abstract: The invention relates to a display system using a remote control transmitter handunit having both a "pointing function" capability for moving a cursor displayed on a display screen by changing the angular position of the remote control handunit, and the capability of sending dedicated function data directly to the receiver. Thus, numeric data representing, for example, channel number or time of day, being unsuitable for selection from a menu is directly transmitted along with "pointing function" data transmission.

Abstract: A keyboard assembly is disclosed comprising a waterproof portion which includes a sheet of printed key tips mounted on a cover support member overlying an indicia sheet identifying the key tips, first and second switch-matrix electrical conductors separated by an insulator sheet mounted on printed circuit board, a plurality of light-emitting diodes mounted in the printed circuit board for selectively lighting one of the key tips when operated, a plurality of I.C. circuit elements secured to the lower surface of the printed circuit board and connected to the electrical conductors forming an electrical circuit associated with the operation of the keyboard and a key operated switching mechanism extending through the keyboard to sense light emitted from elements mounted in the lower surface of the printed circuit board for controlling the operating mode of the keyboard.

Abstract: A data terminal interface device for use with personal computers having small or limited display capacities. A plurality of specific node setting capabilities of the computer. Designated keys are associated with the display to enable the operator to easily step through one general format or another.

Abstract: A selective calling receiver with automatic memory storage and turn-on indication is disclosed. When the receiver is placed in the called state by an incoming signal, audible and/or visual indicator signals actuated by the incoming signal are automatically stopped after a predetermined period of time has elapsed and record of the called state is simultaneously kept in a memory integral to the receiver. Indication of the called state is regenerable at a later time by a switching operation. Indication of the called state is stoppable without recording such indication in memory when a manual reset operation is performed before indication of the called state is automatically stopped.

Abstract: An alphanumeric display including an array of 42 electrically energizable, light-emitting or reflecting segments which, when selectively energized, are capable of forming legibly all numerals and upper and lower case alphabet letters and/or mathematical and punctuation symbols. The array disclosed is characterized by arrangement of the light-emitting or reflecting elements in closely nested relation to form a vertically disposed rectangular display. A solid state system employing the display means including light-emitting diodes and switching transistors is disclosed.

Abstract: An array of binary elements suitable for alphanumeric or graphic displays are electrostatically actuated. The elements have a flexible member overlying a stator member. The flexible member has a bulge which is transferred along the element by sequential de-energization of a plurality of electrostatic electrode regions. Transfer of the bulge linearly shifts the flexible member with respect to the stator member to alter the state or to change appearance, light transmission, or electrical characteristics of the element.

Abstract: An optical translator device capable of providing information indicative of the amount and direction of relative movement between the device and a surface positioned relative thereto. The device comprises a light source for providing at least partially coherent radiation and the source radiation is directed toward an area of the surface area. The reflected coherent radiation or light at the surface area undergoes optical interference due to the texture of the surface thereby forming a speckle pattern consisting of light and dark features. A detector array at the device comprises a plurality of photodetector cells and positioned in the path to receive the reflected light and to detect the light and dark features as represented by the cells in the array detecting light features in the reflected light thereby representative of a sample of the speckle pattern. Means is provided to compare consecutively produced samples which are indicative of the translatory information.

Abstract: A telemetering system wherein a transmitting device responsive to an input signal derived from a sensor representing a metered variable, such as temperature or flow rate, is adapted to generate a corresponding direct-current signal. This signal is conveyed over a two-wire line to a receiving station through a terminal resistor across which a voltage signal is developed corresponding to the incoming current signal. The receiving station includes a DC power supply whose output is fed over the same two-wire line to the transmitting device to provide operating power therefor. In order to enhance the power available to the transmitting device, the current signal generated by the transmitting device lies in a 0% to 100% signal range in which the ratio of direct-current I.sub.o at 0% signal to direct-current I.sub.100 at 100% signal is greater than 1/5 or 0.2.

Abstract: A local communication system among ISDN terminal equipment in a user's premises are connected to a local passive bus of the LSDN basic-access interface. The present system can establish the local communication through a network termination unit among ISDN termination equipment. In order to establish such a local communication, a multiframing scheme is taken on a passive bus forming multiframes by combining together the predetermined number of frames which are as defined in the I.400 series of CCITT recommendations. The network termination unit has a switching device for coupling two circuit-switched type communication channels (B1, B2) on the passive bus in one direction of transmission with the two other channels (B2, B1) in the other direction to establish local communication. Alternatively, the switching device couples the two channels on the passive bus with those on the subscribed line to establish external communication.

Abstract: A turn signal cancelling apparatus for a vehicle having a handlebar and a blinker unit which is operable to be activated by a manual operation and is operable to be deactivated by a cancelling signal.

Abstract: A system for recognizing touch positions along an axis on a surface associated with a touch control apparatus comprises a substrate having a surface capable of propagating surface acoustic waves and so characterized that a touch on that surface causes a perturbation of a surface wave passing through the region of touch. An input surface wave transducer coupled to the substrate surface launches a burst of surface waves on the surface. An output surface wave transducer coupled to the substrate detects received surface waves. Wave redirecting gratings derive wave components from the launched wave and redirect them across the substrate surface to the output transducer. The wave components are caused to traverse the axis along a progression of paths associated with different touch positions along the axis.

Abstract: An electronic locking system including a lock cylinder having an electronically actuable release assembly which is selectively enabled to disengage a pin from a cylinder plug, to permit the rotation of the plug by an inserted key. The lock cylinder and key each contain non-volatile, electronically alterable memory devices, such as EEPROM integrated circuits, which house keying system codes. The key EEPROM is preferably housed within the key blade, in a key design which closely resembles a traditional mechanical key. The release mechanism incorporates a locking pin which is moveable between plug-engaging and non-engaging positions, along a radius of the lock cylinder. The release mechanism may include a primary actuator which directly moves the locking pin, or may act indirectly upon the locking pin via a latching member.

Abstract: A color video display apparatus displays a first image represented by luminance and color difference data stored in a VRAM and a second image represented by color codes stored in the same VRAM on a screen of a CRT display unit in a superimposed relation. Each address of the VRAM stores the luminance data and an attribute bit of the corresponding display dot of the first image, and the color difference data is formed with respect to each group of a predetermined number of display dots of the first image and stored in a predetermined number of addresses of the VRAM. The color code of each dot of the second image is stored in the corresponding addresses of the VRAM. The data sequentially read from the addresses of the VRAM are shifted into a register group composed of a predetermined number of registers.

Abstract: An aircraft automatic fault reporting system having a plurality of ARINC 429 low-speed data buses between the aircraft maintenance control panel and the aircraft communications addressing and reporting system provides two-way communication therebetween. Detected faults through an eight-digit fault code are by means of a transient logic circuit under certain conditions of the aircraft communications and addressing systems provided to maintenance personnel thereby eliminating flight crew use of FRM's.

Abstract: An electrostatic capacity type encoder which includes a rotary disk rotatingly provided on an encoder body, and a first stationary disk and a second stationary disk fixed to the encoder body to face each other with the rotary disk arranged therebetween. A plurality of transmitting electrodes are provided on the first stationary disk. On the rotary disk is provided not only a plurality of receiving electrodes facing the transmitting electrodes on the first stationary disk but also a coupling electrode connected to the receiving electrodes and facing the second stationary disk. An output electrode is provided on the second stationary disk to face the coupling electrode on the rotary disk. To the respective transmitting electrodes are applied alternating currents with respective different phases, and the amount of rotating displacement in the rotary disk is detected in accordance with the output signal from the output electrode which changes with the rotation of the rotary disk.

Abstract: A digital device for visually displaying the value of a generally continuously varying function, such as car speed. The device displays subranges of a full scale, putting them individually in a viewing area. The displayed subranges in the viewing area will be replaced as required to permit representation of the input function over the full scale. The device allows selection of a new subrange with the property that the input function value initially will be at an interior position in the new subrange, thereby preventing repeated rapid switching between subranges. The subrange display can be defined using scale markers in just a few fixed positions in the viewing area.