Abstract: A frequency generator or filter which includes a signal source of simultaneous multiple frequencies, a voltage controlled oscillator (VCO), a circulator coupled between the signal source and frequency terminal of the VCO and a source of control voltage signals coupled to the control voltage terminal of the VCO. A control voltage corresponding to a desired one of the frequencies produced by the signal source is applied to the VCO causing it to produce a frequency approximating the desired frequency. Then the signal from the frequency source injection locks the VCO to exactly the desired frequency.

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 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 video camera or similar scene observing device, mounted on a movable workpiece to be aligned with a target, views the scene that the workpiece is directed toward. A video viewing device is receptive of signals from the observing device for displaying a portion of the field of view on the viewing device and is receptive of a position error signal for controlling what portion of the field of view is displayed. First and second signals are produced representing the desired rate of movement of the workpiece and actual rate of movement of the workpiece, respectively. The difference between these signals is integrated to produce the position error signal. Therefore, the viewed scene moves only in response to the signal indicative of the desired rate of movement. If there is no desired rate of movement, the image appears stationary on the viewing device even though the workpiece may be oscillating about a desired position.

Abstract: A solid state relay having a light-emitting diode, an array of series connected photodiodes, a field-effect-transistor (FET) and optically controlled switch for FET turn off is described.The light-emitting diode is optically coupled to the array of photodiodes. Turn on of the transistor is determined entirely by the voltage developed by the array of photodiodes. Turn off of the transistor is determined by the state of the optically controlled switch.

Abstract: A predistortion circuit for use with a solid state power amplifier or traveling wave tube amplifier which exhibits phase and amplitude nonlinearities. The predistortion circuit, which produces gain and phase distortion complementary to that of the associated power amplifier, comprises a hybrid circuit for splitting the input signal into two output signals at respective output terminals, the signals having a relative phase difference of 90.degree., a pair of dual gate FETs or other active nonlinear devices each connected to a different one of the two output terminals and a combiner for combining in-phase the outputs of the nonlinear devices. Bias on the nonlinear devices is adjusted to effect, in the predistortion circuit, nonlinearities complementary to those of the power amplifier.

Abstract: A predistortion circuit for a microwave power amplifier which exhibits phase and amplitude nonlinearities and has a small signal gain equal to a. The phase distortion circuit includes a 180.degree. coupler, a first coupler for coupling a given fraction of the input power to the 180.degree. coupler and a second coupler for coupling the given fraction of the power output from the amplifier, reduced by a, to the 180.degree. coupler. The 180.degree. coupler has a difference output port at which a signal appears which corresponds substantially to the difference in phase between the two signals input to the 180.degree. coupler and has a sum port at which a signal appears which corresponds substantially to the sum in amplitude between the two signals input thereto.A phase change circuit and attenuator are coupled between the first coupler and input to the power amplifier. Signals related to the signals produced at the difference port and sum port of the 180.degree.

Abstract: A phase modulation circuit to provide at an output terminal an output signal controllably shifted from 0.degree. to 360.degree. relative to an input signal provided at an input terminal includes a first 90.degree. coupler connected between the input terminal and second and third 90.degree. couplers, four gain controllable amplifiers, fourth and fifth 90.degree. couplers and an in phase combiner with its output connected to the output terminal. Two of the amplifiers are connected between the second and fourth couplers. The additional amplifiers are connected between the third and fifth couplers. The fourth and fifth couplers are connected to the inputs of the in-phase combiner. The gain through the various amplifiers is adjusted to control the amount of phase shift through the circuit.

Abstract: A power controller determines which of a plurality of possible input voltages is present and configures a load to operate at that present input voltage.

Abstract: A multiplex bus system comprises a master control unit (MCU) connected to at least one receiver-transmit unit (RTU) by a data bus. The MCU transmits to the RTU a message comprising a synchronization pulse of known duration and successive time spaced timing signals separated by time duration T marking the boundaries of data bits to be transmitted from the RTU to the MCU. The RTU includes a clock pulse source which utilizes the synchronization pulse to determine the frequency of the clock pulse source in P pulses per duration T. The value P is used in conjunction with the timing signals to create properly timed data determining signals in the data bits.

Abstract: A laser is modulated in accordance with an input signal of time varying value. The modulated beam is intercepted by a Bragg cell acoustically modulated in accordance with one or more preselected control frequencies from a selectable source of such frequencies. The beam is deflected by an amount or amounts dependent on the acoustically modulated frequency or frequencies. A plurality of photodetectors are positioned to intercept the deflected beam at its respective possible deflection angles and to convert optical signals so recieved into electrical output signals. Thus by choice of control frequency, a signal corresponding to the input signal can be caused to appear at the output of one or more photodiodes.

Abstract: A 180.degree. hybrid receptive of a fundamental frequency signal which may be adjusted over a range of frequencies produces the fundamental frequency signal at two output ports phased 180.degree. apart. Each of the output ports is coupled to a non-linear active device which produces the fundamental frequency and odd and even harmonics thereof. A 180.degree. and 0.degree. hybrid is coupled to receive at respective input ports the signal from the active devices and to produce at one output port all the odd harmonics and to produce at the other output port all of the even harmonics of the fundamental frequency. The even and odd harmonics of the fundamental frequency appearing at the two output ports of the 0.degree. and 180.degree. hybrid are isolated from one another.

Abstract: An electronic circuit including a substrate with an aperture therethrough is manufactured by cutting one or more slots in an edge of a slab of substrate, metalizing the slotted edge of the substrate and metalizing a mating edge of a mating substrate, securing together the metalized edges of the slotted substrate and mating substrate to create an aperture through the substrate from an upper surface to a lower surface thereof and creating a printed circuit pattern on one of the upper and lower surfaces of the combined substrate and metalizing the other surface of the combined substrate including a connection to the metalized edges.

Abstract: A plurality of component lead processing assemblies are located in a plane each releasably secured to a different given location on a support structure. Each processing assembly has an anvil and a lead processing part which is rotatable relative to the anvil for performing the lead processing on leads of components secured to a printed circuit board. A link structure is coupled to each lead processing part movable in a direction parallel to the plane of the processing assemblies for concurrently rotating the processing parts in response to the actuation of drive means.

Abstract: A commutating filter circuit producing only the fundamental frequency and odd harmonics of an input signal comprises first and second commutating filters each connected to receive the input signal and coupled to pass an output signal to the non-inverting and inverting terminals, respectively, of a differential amplifier. The first filter comprises N stages, each having a time constant of RC and a filter sampling frequency of f.sub.1. The second filter comprises N/2 stages, each having a time constant of 2RC and a filter sampling frequency of 2f.sub.1. The resultant signal from the differential amplifier contains only the fundamental frequencies and odd harmonics of the input signal.

Abstract: A heart rate monitor for use where direct contact with a patient cannot be made utilizes two continuous radio frequency (RF) signals, one of relatively low frequency and one of relatively high frequency directed toward the patient whose heart is to be determined. Doppler shifted signals are reradiated by the patient back to the monitor. The reradiated low RF signal has doppler components due to bodily motion caused by respiration and heartbeat. The reradiated high RF signal has doppler components due to patient bodily movement caused by respiration. Doppler components due to heartbeat if any, are of substantially lower value than those associated with the low RF signal. The heart rate monitor includes a difference amplifier which effectively subtracts the doppler signal associated with the high RF frequency from the doppler signal associated with the low RF frequency to obtain a signal which contains only components due to the heartbeat of the patient.

Abstract: An apparatus for adapting a sliding screen door for hingable mounting to a sliding glass door structure includes a pair of hinges mounted to one side of the screen door and to one side of a fixed door panel of the sliding glass door structure permitting the screen door to assume a position closed against the sliding glass door structure frame or away therefrom. A filler strip is positioned between the fixed door panel and hinged side of the screen door to provide an insect tight seal therebetween.

Abstract: A system for measuring wheel wear of a railroad vehicle includes a first speed measuring device, such as a microwave doppler speed sensor for measuring speed of the vehicle independent of wheel rotation rate, a second speed measuring device for measuring vehicle speed in terms of wheel rotation rate and a comparison device for measuring the difference of the two speed signals over time to therefore provide a signal indicative of wheel wear.

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 vehicle multiplex system includes a power conductor for conveying electrical power to power-operated units on the vehicle, and a single signal conductor for controlling the connections of power to power-operated units. A multiplex timing unit applys a tri-state timing waveform to the signal conductor. Each of a plurality of control signal transmitters is operative in response to a physical command to apply a corresponding control signal to the signal conductor during a control time period in a channel interval assigned to the particular transmitter. And, each of a plurality of control signal receivers is operative to control the connection of electrical power from the power conductor to a power-operated unit in response to a control signal received from the signal conductor during a control time period in a channel interval assigned to the particulate receiver.