Abstract: A method and apparatus for synchronizing unrelated video type signals from two different sources without employing feedback loops between the two sources.Incoming video signals are converted from analog to digital form and are clocked into a shift register unit by input clock signals phase and frequency locked to the instantaneous horizontal frequency and the color burst frequency portions of the incoming signal. The digitized video signals progressing along the shift register are stored at the input clock signal rate in a random access (RAM) having a sufficient capacity to provide continuous output video signals during each field. The signals are clocked out from the RAM by output clock signals derived from the sync and color burst portions of a local signal comprising either composite video or composite color burst, which are synchronized with the local sync generator.

Abstract: A portable calculator utilizing a solar panel array which can be either slidably moved within the calculator's housing or pivotly connected to it and which when exposed to incident light provide power for the calculator.

Abstract: A sheet comparing system, in which comparison between a number of sheets to be counted and an actually counted number of the sheets is carried out so that noise signals other than the signals required to carry out the comparison are excluded. A simple comparator circuit adapted for the sheet comparing system is also disclosed.

Abstract: A method and apparatus for controlling the yield of fabric material from a tenter frame having spaced apart belts driven by drive means and an overfeed roll at its entry end. In a start-up or style change mode of operation a predicted dry yield is computed from data signals received before the fabric enters the tenter frame, then compared with a target value to produce a control signal to the overspeed roll. In the steady state mode of operation, actual yield is computed from data taken at the output end of the tenter frame; then is compared with a target yield value and thereafter modified by a correction factor proportional to variations in predicted dry yield computed from inputs taken at the entry to the tenter frame; the modified control signal again being applied to the overspeed roll.

Abstract: Apparatus for controlling the phase of a clock signal in a data transmission system is described. In the latter system the data signal is pulse amplitude modulated, routed to a receiver-demodulator over a transmission path, the data signal retrieved by means of a sampling circuit and coupled to a data sink. A difference signal is produced from the demodulated and the data signals; the amplitudes of the difference signal characterize the amplitude differences between the demodulated and the data signals at predetermined sampling instants. Using the demodulated signal a slope signal, which is indicative of the slope of the demodulated signal at the sampling instants is produced. The difference and slope signals are multiplied producing a product signal having amplitudes equal to the product of the latter two signals. The product signal forms a control signal for altering the phase of the clock signal by adding to or suppressing pulses emitted from a frequency divider.

Abstract: Apparatus for use with an area navigation system wherein the craft is maintained on a predetermined vertical flight path. Specifically, a pitch command signal for controlling the vertical flight of the craft, which is substantially free of discontinuities, is produced by summing a signal indicative of the vertical displacement of the craft from the flight path with a damping signal representative of the vertical deviation rate of the craft from the vertical velocity required to maintain the craft on the flight path. Additionally, the vertical displacement signal is limited to a maximum amplitude to compensate for discontinuities therein, with respect to passage of the craft through the vicinity of a VOR/TAC station.

Abstract: A comparator circuit for two multi-digit binary codes, particularly binary numbers, in which a series circuit is formed by n number of majority decision elements connected in series, each of which has three inputs, the characteristic information of the first binary number being supplied to a respective input in a negated manner, and the information of the second binary number to another respective input in a non-negated manner. In one embodiment, an evaluation circuit for a qualitative comparison result utilizes a test pulse in conjunction with the binary numbers, which pulse is supplied to the last element of the series connected elements. Depending on the embodiment, the qualitative comparision result may be read out either in response to a test pulse or continuously.

Abstract: A method of, and apparatus for, the remote transmission of signals over a line, especially via an electrical energy supply network, wherein at the transmitter there is formed from a first auxiliary frequency delivered to the transmitter a signal frequency which is in a predetermined first relationship to the first auxiliary frequency, an auxiliary signal characteristic of the first auxiliary frequency and the signal frequency are transmitted via the same transmission channel or via different transmission channels to at least one receiver, and at the location of the receiver there is formed from the signal characteristic of the first auxiliary frequency a second auxiliary frequency which is in a predetermined second relationship to the first auxiliary frequency, and such second auxiliary frequency is delivered to a sampling filter for controlling its throughpassage characteristics.

Abstract: Apparatus for monitoring two sinusoidal electric quantities of a common period, comprises two similarly timed samplers, an arithmetic unit for combining, in accordance with a preselected relation, three consecutive samples of each electric quantity so as to produce an output signal which is independent of time and phase relations between the sampling pulses and the respective quantities. The output signal may be determined solely by peak values of the respective quantities, phase difference between the electric quantities, and timing period. The apparatus further comprises a discriminator circuit having a reference level and responsive to the output signal for producing a signal for use in monitoring the electric quantities.

Abstract: A computer generates an output command identifying an alpha-numeric character or symbol to be printed. A code converter decodes the computer output command and converts it to a command which can be recognized by a print device as the same alpha-numeric character or symbol identified by the computer output command.

Abstract: A system for communicating digital data which utilizes a synchronization eme in which a transmitter transmits a binary 1 followed by n data bits which are followed by n + 1 binary 0's and in which a receiver is synchronized with the transmitter by generation of a master clock in response to receipt of the transmitted binary 1 and by initiation of a frame pulse having a pulse duration equal to the duration of the incoming data frame.

Abstract: The differences between two pairs of the three windings of a synchro stator are individually scaled so as to provide a function of the rotor angle plus a 45.degree. phase lead. The scaled values are applied to a CR/RC bridge, the output of which bears a phase relationship relating directly to the synchro rotor angle, but is identical for shaft angles from 0.degree. to 180.degree. and from 180.degree. to 360.degree.. These signals are shaped and applied to a pulsewidth modulator; the pulsewidth modulation ambiguity is resolved by generation of a sign bit indicative of angles between 180.degree. and 360.degree.. The pulsewidth modulated output is converted to an analog level, as is the reference supply voltage, and an analog to digital converter provides a digital output as a function of the ratio of the angle voltage level to the reference voltage level. The sign bit is provided as an additional digital bit thereby providing a digital output indication of shaft angle.

Abstract: A totalizer is provided which is adapted to accept a variety of process signals at the input thereof, which process signals will be in analog form. The signals are then first converted into digital form by first converting all of the types of input signals to a voltage signal that is proportional to the value of the input signal and then converting this voltage signal to a series of pulses whose repetition rate is proportional to the voltage input and then counting these pulses on a decade counter which is provided with a decimal decoder through which a scale factor may be introduced into the counter. The output of the initial decade counter is then fed into a memory bank having a visual readout.

Abstract: A transmit phase control system of synchronization burst is disclosed for use in a SDMA/TDMA satellite communication system in which a phase error between a synchronization burst transmitted from an earth station and a synchronization window, assigned as a time slot on a satellite for returning the synchronization burst, is measured and the transmit phase of the synchronization burst is controlled based on the measured value. Phase error measurement is achieved a plurality of times in connection with the received synchronization burst of each station, and a decided phase error is derived based on the measured value obtained by the plurality of measurements. The transmit phase of the synchronization burst is then controlled in accordance with the decided phase error.

Abstract: A system is disclosed for checking and correcting the synchronism of bits stored in a circulating memory which is part of a PCM switching system. Periodically, bits previously written in an addressable memory are read-out and compared to corresponding bits supplied by the circulating memory. In accordance with results of the comparison, a synchronism signal or a fast or slow correction signal is supplied.

Abstract: An interface logic circuit permitting the transfer of information between two computers having asynchronous clocks is disclosed. The information transfer involves utilization of control signals (including request, return-response, ready) to generate properly timed data strobe signals. Noise problems are avoided because each control signal, upon receipt, is verified by at least two clock pulses at the receiving computer. If control signals are verified, a data strobe pulse is generated to accomplish a data transfer. Once initiated the data strobe signal is properly completed independently of signal disturbances in the control signal initiating the data strobe signal. Completion of the data strobe signal is announced by automatic turn-off of a return-response control signal.

Abstract: The rpm, dwell and timing of an internal combustion engine are measured by starting and stopping a digital counter on the leading edge of pulse waveforms generated either within the engine or by a timing light. For rpm measurement, the counter is started when the ignition points open, and stopped upon the next opening of the points. To measure dwell the counter is started by the opening of the points and stopped when the points close, and this count is subtracted from the rpm count to obtain dwell. Timing is measured by starting the counter upon the firing of the number one cylinder, and providing an additional signal delayed in time as a function of the distributor advance to stop the counter. The count in the counter is converted to rpm, dwell or timing by either analog or digital techniques. A high energy ignition adapter circuit prevents triggering of the counter by a false indication of the opening of the points in vehicles using high energy ignition systems.

Abstract: In a feedback control circuit, a circuit maximizes or minimizes a controlled signal by incrementally varying the controlling signal in one sense, determining the direction of controlled signal change in response to such variation, and then incrementally varying the controlling signal in the same or the opposite sense in accordance with such direction. A condition of the system is that the controlled signal must reach a maximum or minimum in the range of the controlling signal. For illustration, the circuit is described in an analog-digital form applied to a wheel slip control of an electric locomotive to adjust the motor current to a maximum value to obtain the peak tractive effort that the rail conditions will permit.

Abstract: An exerciser combined with means for converting the output energy to measurable form and adjusting the indicated energy output by the exerciser to a quantity of exercise desired and means for measuring the energy output of the exerciser in calories.

Abstract: A method is described for establishing character frame synchronism between a teletypewriter transmitter and receiver wherein the direction of transmission is unidirectional. The transmitter sends character signals identifying characters of the alphabet or the like and operating condition signals corresponding to the operation condition of the transmitter. The operating condition signals are processed in a code converter which allocates code words to them permitting recognition of the character frame. The code words are transmitted to the receiver wherein a clock signal is derived by means of a character frame discriminator. The code words are reconverted in the receiver in order to cancel the code conversion which took place at the transmitter.