Abstract: A magnetically susceptible part motion sensor where the sensor is subject to random accelerative conditions. The sensor comprises a first accelerometer and magnet combination and a second accelerometer and nonmagnetic body combination. The accelerometers are substantially identical and the nonmagnetic body is substantially identical in weight, size and other characteristics to the magnet. Therefore the signal produced by the accelerometers due to random accelerative motion are identical but the first accelerometer produces a signal component corresponding to the passage of the magnetically susceptible part. A differential amplifier is connected to receive the outputs of the two accelerometers and to produce an output signal corresponding substantially only to the passage of the magnetically susceptible part.

Abstract: A rotatable drum is arranged around a surface lying generally parallel to the axis of rotation, a plurality of bar code patterns, the individual bars making up each pattern extending normal to the rotational axis. A light beam in a plane is projected onto the surface, the plane lying generally parallel to the rotational axis such that light strikes the surface. A light beam also in a plane is reflected from the surface, the beam having relatively light and relatively dark regions corresponding to the particular bar code patterns upon which the projected beam is imaged. The reflected beam is passed through a cylindrical lens which fans the reflected beam into a wedge shaped beam projecting onto an object in the path of the beam successive bar patterns as the drum rotates.

Abstract: A calibration instrument for calibrating a continuous wave microwave doppler radar includes a piezoelectric sounder and means to energize the sounder to produce an acoustic signal to simulate motion of a body to the radar.

Abstract: An articulated vacuum arrangement. A plurality of vacuum fingers are pivotably coupled to a base member, each vacuum finger comprising an arm extending from the point of pivot to an orifice to the atmosphere, each arm defining an air passage channel. The base member includes, for each vacuum pad, an orifice. An airtight structure connects between each base member orifice and its associated vacuum pad arm. A structure is included for creating at selected ones of the vacuum fingers a reduced pressure relative to atmospheric pressure.

Abstract: An identification system comprising one or more tags and an interrogator. A tag is responsive to a radio frequency signal transmitted from the interrogator for phase modulating the signal alternately with a first frequency and a second frequency depending on a preselected code and for re-radiating the phase modulated signal back to the interrogator.

Abstract: A tag is receptive of two radio frequencies (RF signals) for mixing the two frequencies and radiating a signal which is either or both the sum and difference of the two RF frequencies. A uniquely identifiable tag includes, in addition to the mixer one or more filters for radiating a signal only when the sum or difference of the two signals is a pre-specified value or only when the RF signals are each of pre-selected values.

Abstract: A rotating member produces a signal corresponding to a given value M of angular rotation thereof. A clock produces pulses at a given rate. A counter mechanism is responsive to the signal and to the clock pulses for generating a number related to the number of clock pulses produced during a unit value X of rotation of the rotating member where X is unequal to M. The number may be used to determine when a value N of angular rotation has occurred.

Abstract: A power limiter circuit for a radio frequency transceiver of the type having a single input-output antenna port is comprised of an isolator, first and second three port circulators and a pair of PIN diodes. One port of the first circulator is connected to the antenna port and one port of the second circulator is coupled to a transmit/receive antenna. The second ports of the two circulators are connected together through the isolator for passing signal from the transceiver to the antenna and the third ports of the two circulators are connected together for passing signal from the antenna to the transceiver. The PIN diodes, arranged in inverse parallel relationship, are connected between the third ports and circuit ground and operate in connunction with the isolator to limit to a safe value the signal passed from the antenna to the transceiver.

Abstract: A universal interface adaptor circuit (UIAC) for connecting any one of a plurality of either of two general microprocessor types to a peripheral device using the same interface connections to selectively generate and supply either a WRITE ENABLE signal or a READ ENABLE signal to a peripheral device. A first of the two general types of microprocessors is used in multiplexed-bus multiprocessor (MBM) systems and the second of the two general types of microprocessors is used in non-multiplexed-bus microprocessor (NMBM) systems, where the microprocessors used in both the MBM and the NMBM systems each supply three output signals for determining whether the function is a READ or a WRITE function and the time of occurrence of such READ or WRITE function. The UIAC comprises logic array having three input terminals X, Y, and Z for receiving the three output signals from each of the microprocessors employed in either the MBM systems or the NMBM systems.

Abstract: A signal component separating circuit is responsive to a signal having a pulsing component and a reciprocating component for providing a signal corresponding to the pulsing component. The circuit includes first and second channels the outputs of which are coupled to respective inputs of a comparator circuit which produces the signal corresponding to the pulsing component of the input signal.Each of the channels includes a peak detection and holding circuit which includes a charging and discharging circuit. The second channel peak detection and holding circuit has a faster charging and discharging time than the first channel peak detection and holding circuit. The second channel peak detection and holding circuit attenuates the input signal more than the first channel peak detection and holding circuit. As a result the signal in the first channel is greater in amplitude than the signal in the second channel except when the pulses are present.

Abstract: In a system having N devices all using a common data bus (CDB), a priority resolution circuit (PRC) for determining that particular device of the N devices which shall obtain control of the CDB when a device other than the particular device is attempting to obtain control of the CDB and comprising first logic common to all of the devices. A first control bus is common to every device and has a high signal level (SL) thereon when none of the devices is attempting to obtain control of the common data bus and a low SL thereon when any of the devices is attempting to obtain control of the CDB; and a second control bus is common to every device and has a low SL thereon when none of the devices has control of the CDB and a high SL thereon when any of the devices has control of the CDB.

Abstract: A means to set spark timing in accordance with engine speed includes a counter to count clock pulses between engine speed reference pulses. A read-only memory has successive memory locations each storing an addend quantity and a repeats number. An adder unit, including an accumulator, operates to access the memory locations, and to add the addend quantities to the contents of the accumulator repeatedly a number of times equal to the respective repeats numbers. A comparator produces an ignition firing pulse when the contents of the accumulator corresponds with the reference period number provided by the counter.

Abstract: A singulation system for receiving unsingulated mail at a singulation station and for passing to an output station singulated mail. The singulation system includes a camera for viewing the unsingulated mail at the output edge of the singulation station for determining a profile of the top piece of unsingulated mail and a positionable lip at the output edge of the singulation station responsive to the signal indicating the profile for becoming shaped to the profile so that the upper piece of unsingulated mail can be passed over the lip to an output station.

Abstract: A coherent-on-receive radar for determining the velocity of and distance to targets. The radar conventionally includes a transmitter of non-coherent pulses, an antenna for transmitting the pulses into space and receiving return signals from targets upon which the pulses impinge, a local oscillator and a phase detecting circuit responsive to the return signal and local oscillator signal for determining the phase difference between the respective signals. In accordance with the invention the radar includes a sample and hold circuit used in conjunction with the phase detecting circuit, prior to the receipt of any return signal, for storing for each transmitted pulse its phase difference from the local oscillator signal phase.

Abstract: A vehicle identification system includes a doppler radar producing a doppler frequency signal having noise components and having a value f.sub.D corresponding to the speed of the vehicle to be identified and a doppler frequency having a value X.multidot.f.sub.D corresponding to the speed of the vehicle propelling means, each doppler frequency being modulated by signals corresponding to the movements made by individual elements of the vehicle propelling means. The doppler signal is passed through first and second adjustable filters adjusted to pass f.sub.D and x.multidot.f.sub.D respectively and sidebands relating to the modulating signal. Amplitude detectors coupled to the outputs of the two filters remove the doppler frequencies leaving the modulating signals relating to the movement of the vehicle elements. The modulating signals are applied to an adjustable commutating filter adjusted to frequency by a signal corresponding to frequency f.sub.D.

Abstract: A microwave cavity oscillator comprises a waveguide blocked at both ends, an active device enclosed in the waveguide and a dielectric powder or other fluid filling the remaining space in the waveguide. The microwave cavity oscillator is useful, for example, as in a discontinuity detector system.

Abstract: A self-propelled vehicle power train evaluation method employing a speed measuring radar directed toward a vehicle under test includes the steps of accelerating the vehicle toward the radar at full acceleration until a given speed is reached and recording the resulting speed versus time signal, optionally accelerating the vehicle away from the radar to thus produce an average speed versus time signal and comparing the thus produced speed versus time signal with a signal representing a standard vehicle of the type under test.

Abstract: An in-phase power divider is constructed of a double field-effect transistor having a common source, first and second gates and first and second drains. The gates are coupled together and adapted to receive a radio frequency signal of power P to be power divided. The power divided output signals each at substantially P.div.2 or more appear at the drains. An alternative power divider for producing unequal power division is constructed of a double dual gate FET having, in addition to the above-mentioned elements, third and fourth gates. By appropriate unequal application of gate bias to the additional gates unequal power division is effected.

Abstract: An in-phase power combiner is constructed of a double field-effect transistor having a common drain, first and second gates and first and second sources. The gates are adapted to receive radio frequency signals of powers P1and P2, where P1=P2, to be power combined. The combined power output signal P equal to at least P1+P2 appears at the drain. An alternative power combiner for producing power combination of two unequal power input signals is constructed of a double dual gate FET having, in addition to the above-mentioned elements, third and fourth gates.

Abstract: A two-cavity notch filter including an input terminal inductively coupled to an output terminal having a low impedance connection therebetween, a first relatively high impedance resonant tank circuit including the series combination of a circuit grounded capacitor and circuit grounded inductor having a tap point thereon, a capacitor and optionally in series therewith an inductor connected between the input terminal and tap point. The notch filter also includes a second relatively high impedance resonant tank circuit including the series connection of a circuit grounded capacitor and circuit grounded inductor having a tap thereon, and a capacitor and, optionally, in series therewith an inductor between the output terminal and tap point of the second tank circuit inductor. There is capacitive coupling between the capacitors forming the first and second tank circuits.