Abstract: An object to be protected is placed on a compressible pad having upper and lower conductive plates, separated by a compressible dielectric. A sensing device is connected to the upper and lower plates to sense a first capacitance when the upper plate is compressed by presence of the object, and a change in capacitance when the object is removed so as to permit the dielectric layer to expand and change the capacitance. There is a time delay circuitry and other circuitry to alleviate the possibility of false alarms.

Abstract: A PLL system having a variable oscillator and apparatus for generating both phase and frequency error signals for controlling the variable oscillator, includes apparatus, responsive to the polarity of the frequency error signal, to selectively disconnect the frequency error signal from the variable oscillator when the PLL system approaches phase lock.

Abstract: A tuning system includes a microcomputer-based synchronization signal detector which does not require the use of a hardware timer/counter. The microcomputer samples the output signal of a sync separator coupled to an ordinary input/output port during a number of different evaluation intervals to determine if respective characteristics of a valid sync signal occur. During one evaluation interval, a test is performed to determine if a "high" level is present for a time duration less than a given time duration (e.g. 10 .mu.S) corresponding to the maximum duration of horizontal sync pulses. During another evaluation interval, a test is performed to determine if a "low" level is present for a time duration greater than another given time duration (e.g., 40 .mu.S) corresponding to the minimum separation between horizontal sync pulses. The sampling intervals and evaluation intervals are established by the time required to execute instruction cycles.

Abstract: A solution for making a wear-resistant conductive contact patch for a faceplate panel of a color CRT which facilitates the electrophotographic manufacturing of a luminescent screen on the panel consists essentially of, in weight percent, solvent 22 to 70, conductive material 62 to 21, and the balance being other compatible additives.

Abstract: A multi-featured electronic vehicle security system is disclosed. The system is controlled by an electronic controller such a microcomputer. To reduce noise pollution due to false alarms caused by repetitive tripping of the system sensor devices, the system will not respond to more than a defined number of successive trippings of the same sensor device to initiate an alarm condition. The system includes a user-enabled feature wherein a first alarm signal generator is activated by a sensor tripping, and a second, distinct alarm signal generator is activated when a trigger device has been tripped. When the system is passively armed, active sensors and triggers are automatically diagnosed and bypassed, permitting the system to be passively armed even if one or more trigger or sensor is active.

Abstract: A copy sheet discharge apparatus for copying machines comprises a copy sheet guide plate fixed to the side of a cover and a copy sheet holding tray displaced below the sheet guide plate. With respect to this discharge apparatus, the image-bearing faces of copy sheets keep facing upwards while the copy sheets are delivered to the tray and the sheets are stacked into piles in the tray in the completed inversed state with the image-bearing face downwards, whereby the immediate checkup of the copy grade before being stacked in the tray is permitted and the cumbersome rearrangement of the order of the copy sheets after being removed from the tray is not needed.

Abstract: A radio system for determining the range and bearing of mobile equipment, such as an aircraft, relative to reference equipment such as an aircraft carrier, with low probability of interception (LPI). The aircraft remains equipped with high power range and bearing determination equipment, such as TACAN equipment. Reference equipment transmits a LPI beacon, such as a pseudo noise code spread spectrum signal through a rotating beam antenna to amplitude modulate the beacon as a function of antenna orientation. The PN code is inverted as the antenna passes through a reference bearing. Mobile LPI equipment determines bearing and generates a high power signal, such as an emulated TACAN beacon signal. High power range and bearing equipment extracts bearing information from the emulated signal and display it. Range can be determined in a cooperative mode. Mobile LPI equipment transmits a LPI interrogation signal. Reference LPI equipment returns a LPI reply signal.

Abstract: Materials are disclosed which are used to produce traces on a circuit board by means of extrusion. The materials are polymer thick films (PTF) which are thixotropic. Conductive traces are composed of conductive particles, a resin and hardener, and two solvents, one having a relatively high volatility and one having a relatively low volatility. Thus when a newly deposited trace is subjected to a stream of hot air, the fast solvent will substantially evaporate leaving a firm paste behind over which another layer of PTF can be written without causing interference between the layers. The slow solvent then permits the various layers of traces to be polymerized together at the same time in a one step operation. The insulative material is similar to the conductive material in that it includes a resin and hardener and two solvents of differening volatility. In addition, in the preferred mode, it includes a gelling agent.

Abstract: The present invention relates to electronic circuits, such as an operational amplifiers, which have dual power supply requirements. When the power supply voltages are switched between an "off" state and an "on" state, the power supply transient voltages of the two polarities closely track each othe so as to reduce audio transients from being produced within the operational amplifiers. This tracking is accomplished by the negative polarity power supply voltage being provided for the signal amplifier at the output terminal of an unity gain operational amplifier having an inverting input terminal coupled to the positive polarity power supply voltage.

Abstract: A color CRT assembly comprises a tube having an external magnetic deflection yoke thereon. The tube includes an evacuated envelope with a substantially rectangular faceplate panel and a tubular neck connected by a funnel having a rectangular open end sealed to the faceplate panel. A three color phosphor screen is carried on an inner surface of the faceplate panel and a color selection electrode is mounted in spaced relation therefrom. An electronic gun is disposed within the neck of the tube for generating and directing at least one electron beam to the screen. The magnetic deflection yoke is located on the tube, in the region of the funnel-to-neck junction of the envelope, for subjecting the beam to magnetic fields which cause the beam to scan a rectangular raster over the screen. The assembly is improved by the inclusion, in the funnel, of a quantity of glass which attenuates x-radiation from the tube. The quantity of glass is disposed adjacent to the yoke, on the faceplate side thereof.

Abstract: A method and reagent system are disclosed for the rapid isolation, identification and/or analysis of leukocytes from a whole blood sample. The method and reagent system of this invention has application to any environment in which the study and/or analysis of the leukocyte fraction of whole blood requires their isolation in their native or near native state. One of the environments in which this invention can be used to advantage is in the performance of white cell differentiation on automated instrumentation designed for that purpose. In one of the preferred embodiments of this invention, the lytic reagent can contain a mixture of both formic and acetic acid, with the formic acid comprising the major component thereof and the acetic acid being present in only minor quantities, (if at all). This reagent system is used to selectively effect stromatolysis of red blood cells and create subtle modifications to the leukocyte population to enable their automated differentiation into five (5) sub-populations.

Abstract: A mobile antenna system features passive repeater operation to transfer energy between a radio transceiver located inside a vehicle and an external radiator mounted on the outside thereof. By this arrangement, a user of the radio transceiver can gain benefit from the external radiator without the hinderance of a physical, wired connection linking the transceiver to the antenna assembly. In a preferred embodiment, the antenna system operates without any electrical cable extending inside the vehicle from the external radiator.

Abstract: A high voltage measuring system with very high input impedance. The system measures a high voltage source under test by developing a control signal which is proportional to the differential voltage between the high voltage source being tested and an adjustable high voltage reference. This control signal is fed back into a controller which adjusts the reference source so as to match the reference source with the source under test. When the controller detects that matching has occurred, it measures the reference source. By measuring the reference source, as opposed to measuring the source under test directly, the system avoids loading down the source under test.

Abstract: A battery system for use in a battery-operated device, such as a rescue light or radio used in a hostile environment, employs at least one battery element contained within a tubular support member. In embodiments which employ multiple battery elements, the battery elements are in electrical communication with one another, illustratively by welding or soldering their teminals to one another. At one end of the tubular element, a terminal of the battery system is covered entirely by a seal formed of a resilient material. The seal additionally closes the entire end of the tubular member. At the second end of the tubular member, a second seal is provided for closing the second end of the tubular member, but not covering the second battery supply terminal. The battery system operates in conjunction with a housing for the battery-operated device which may have arranged therein a pointed contact which penetrates the first seal so as to achieve electrical communication with the first contact of the battery supply.

Abstract: A pilot release for a press feeder has a spring-loaded support for one of two pinch rollers through which stock material is fed. A cam follower attached to the support engages a cam which is driven by a servo motor. During operation of the press, a position sensor on the press outputs a signal indicative of the position of the press crankshaft. The signal is input to a signal processor which includes a motor control circuit which drives the servo motor of the press feeder. A position sensor on the servo motor also inputs a signal to the signal processor which compares the position of the press to the position of the servo motor, and drives the servo motor to synchronize the motor to the press. The synchronization is such that as pilot pins of the press contact the stock material in the press, an eccentricity of the cam engages the cam follower.

Abstract: A metal detector is provided with circuitry for producing a plurality of vector signals derived from a target signal. Each of these vector signals corresponds to a phase characteristic of target signals. These vector signals define phase ranges which correspond to classifications of targets. Upon detection of a target signal, the metal detector generates first and second phase detected signals which in turn generate a plurality of vector signals. These vector signals are digitized and within a microprocessor a determination is made through slope analysis to determine which range includes the principal phase of the detected target signal. The vector signals which define the identified range are then utilized in algebraic calculations to define one of a plurality of subphase ranges within each range. This identified subphase range identifies a segment in a linear display which is illuminated to show the determined characteristic for the detected object.

Abstract: A television receiver includes a single tuner for tuning both television channels and broadcast FM stations. The tuner is operated at a fixed gain setting in FM reception mode. The tuner serves as the first conversion stage of a double conversion FM receiver, wherein the mixer of an FM radio integrated circuit serves as the second conversion stage. The arrangement operates at a specific and non-arbitrary first IF frequency. The FM receiver is also capable of automatically receiving National Weather Service broadcasts on that one of NWS's seven allocated frequencies which is operating in a listener's area. The receiver provides an on-screen display of the currently tuned FM channel number.

Abstract: A television receiver having a video memory receives a small number of lines of a second low motion content video program transmitted during the vertical blanking interval of a first normal video program, stores and accumulates the lines of the second video program in video memory, and displays the image of the second video program when it is fully assembled. Audio for the second video program is conveyed via a second audio program (SAP) channel. In this manner two video programs, each of which is encoded in a standard television format (i.e., NTSC, PAL, or SECAM) can be received by a single tuner tuned to a single channel. In an embodiment utilizing picture-in-picture processing circuitry, the second video program can be displayed in an inset area of the screen.