Abstract: A video playback system utilizing a vertically moving strip of photosensitive film on which linear bit fields containing a pulse-code modulated (PCM) representation of a television picture have been recorded. The system includes an illuminating means which successively scans a horizontal line of bit fields. Magnifying optics include a linear multiple lens array and a correction lens assembly. As each bit field in the line is successively illuminated, the magnifying optics project an image of the bit field to a linear detector array. Digital information from each bit field is transferred to a buffer; the digital information is converted to analog video signals and applied to the input of a video utilization device. Vertical registration is accomplished by detecting servo information recorded on the film and optically slaving the film drive system to the scanning operation.

Abstract: The reset circuit of a fault indicator is disabled to prevent automatic restoration of the movable target from fault indicating position where it can be observed and manually rest. A manually operable switch is connected across the reset ciruit and its contacts are closed by permanent magnet means or by manually operable switch means.

Abstract: A cable supervision system especially adapted for use in an intrusion alarm installation and which is capable of monitoring at a central control unit all lines of an interconnection cable for proper signal levels and balance. Under intended cable signal conditions a predetermined sensible impedance is provided which is monitored at the control unit. A monitoring circuit is coupled to the end of a system cable remote from the control unit, this circuit being operative to monitor the signal conditions of all lines of the cable. In response to proper signal conditions on the cable as determined by this monitoring circuit a predetermined impedance is provided which is sensed at the control unit to detect a change in impedance which would signal a tamper or cable failure alarm.

Abstract: An on-chip bubble domain circuit organization. One or more storage registers are connected to a propagation path whereby data in the form of magnetic bubble domains (bubbles) may be transferred into and out of the storage registers. The propagation path includes a generator for producing the initial bubbles which are expanded into any desired number of new bubbles by a unique multiple output replicator. A unique input decoder is utilized to determine to which storage register the bubbles from the replicator will be directed along the propagation path. Those bubbles not selected may be annihilated.An output decoder utilizing essentially the same decoding scheme as the input decoder, selectively receives bubbles from the storage register. A transfer and replicate switch is utilized between the storage register and output decoder to selectively transfer bubbles to the output decoder.

Abstract: The present invention pertains to a receiver for a coded electronic security system which includes a plurality of independent transmitting devices each of which generates a pulse coded RF signal when activated. The receiver demodulates the pulse coded signal and separates from the demodulated signal a high frequency square wave unique to each transmitter in the system and a low frequency square wave common to each of the transmitters in the system. The receiver determines the frequency of the high frequency square wave, verifies that the low frequency square wave is the one appropriate for the system, and then indicates which of the transmitters in the system has been activated.

Abstract: The phase sequence of a traffic light is determined by a reprogramable revolving encoder. In one embodiment the encoder has a light source and a drum revolving therearound with selectively positioned apertures. Photocells positioned outside the drum detect the apertures as they move passed to control the light switches in the traffic controller. Some photocells may be deactivated subject to DEMAND, causing the associated traffic phase to be omitted each cycle unless street traffic trips an activation circuit. The encoder has a homing circuit for startup and synchronization with associated traffic lights.

Abstract: A transponder transmitter for transmitting over power lines includes a rectifier circuit that rectifies the power at power line frequency to provide a unipolar potential having ripple at twice the power line frequency. A circuit receives a drive signal from a modulator for interrupting the unipolar potential at a rate corresponding to the carrier frequency of the modulating signal. Circuitry, including a triac couples the interrupted unipolar potential to the power lines.

Abstract: A nonferromagnetic linear variable differential transformer for accurately measuring mechanical displacements in the presence of high magnetic fields is provided. The device utilizes a movable primary coil inside a fixed secondary coil that consists of two series-opposed windings. Operation is such that the secondary output voltage is maintained in phase (depending on polarity) with the primary voltage. The transducer is well-suited to long cable runs and is useful for measuring small displacements in the presence of high or alternating magnetic fields.

Abstract: The device is a translucent plastic mask or overlay which fits over the keyboard of the computer input/output station to label the keys with their functions according to the selected mode of operation. A projecting portion along one of the edges of the mask extends into a slot adjacent the keyboard where a series of code segments forms an optical code which is read by a corresponding series of lamp and photocell pairs to provide the computer with the information to cause its mode of operation to correspond with the keyboard legends.

Abstract: A detector for a dynamic phenomenon with a cyclically varying condition, as motion of a rotating part. At least three digital sensors are separated in phase with respect to the cyclic condition. The instantaneous outputs of the sensors have a plurality of repeating sequential states so long as the dynamic phenomenon exists. The instantaneous outputs of the sensors have at least one state which does not occur during existence of the dynamic phenomenon but which does occur in the absence thereof. Logic circuits respond to the digital sensor outputs and detect information about the dynamic phenomenon. Detection of the repetition rate of an instantaneous output state of the sensors provides a measure of speed. An absence of rotation is indicated by the occurrence of another output state. In another disclosed embodiment, the detector monitors a three phase power system and detects a phase outage by the occurrence of an abnormal sensor output state.

Abstract: This disclosure pertains to a signaling apparatus installed within a movable large vehicle, such as a truck. Two sensing heads are utilized by mounting one of each on the frontmost opposed sides of the vehicle. Each sensor is manually selectively energized so as to detect the distance separating a vehicle being passed from the equipped vehicle on the side of the energized sensor. The sensors may utilize sound, radio or light waves to operate a conventional range detecting apparatus. A comparetor circuit compares the range of the vehicle being scrutinized with the range manually predetermined by setting a minimum range control element. A warning light continues to indicate the proximity of the scrutinized vehicle until such time that the vehicle remains within the pre-set distance manually selected by the operator. A timer may be used to shut off the sensing activity of the sensor in the event of intentional herding of adjacent vehicles oftentimes encountered in heavy traffic.

Abstract: A touch-responsive circuit uses an ohmic contact connected via a dc blocking capacitor to the high impedance input of an amplifier. A controllable impedance element shunts the capacitor and amplifier input. When the element is in the high impedance state, a weak voltage induced by touching the ohmic contact causes the amplifier to produce an output signal indicative of such touching. Touch response is disabled when the element is in the low impedance state. Advantageously, the controllable impedance element comprises a series-connected pair of diodes that are selectively forward or reverse biased; the element also may comprise an active electronic device such as a transistor.A data input terminal employs a matrix of ohmic contacts each having an associated touch-responsive circuit. Column scanning is accomplished by conditioning the controllable impedance elements in all but a selected one column to the low impedance state so that touch response is enabled only in that one selected column.

Abstract: A capacitance-type transducer capsule is placed in a remote environment for xposure to its changing physical conditions. A energy pick-up coil in the capsule receives a remotely-generated signal which is converted to DC power for chargeably establishing the capacitance and for driving a tank circuit which includes the capacitance as the only variable. Changes in pressure, temperature, etc. produce linear variations in the capacitance to modulate the oscillations of the tank circuit and produce a transmittable signal frequency containing the sensed information.

Abstract: There is provided a digital signal generator for producing accurate digital signals according to the detected state of a combination consisting of mechanical and electrical elements. The generator has a signal section consisting of a predetermined conductor pattern including a digital signal pattern and a timing signal pattern and a contact group slidable over the signal section to take out digital signal and timing signal. A digital signal is selectively provided in correspondence to the relative position of the signal section relative to the contact group, and the accuracy of the digital signal is ensured by so arranging that it is provided with the timing signal prevails at a timing signal contact in the aforesaid contact group.

Abstract: An in-plane magnetic holding field, long known to provide improved operating margins for a magnetic bubble memory during stop-start operation, is produced by unique bias magnet designs each of which provides a constant in-plane bias field in a manner consistent with normal bubble propagation as well as with stop-start operation.

Abstract: A remote switching system in which operation of a load is controlled by signals generated at a remote location and transmitted along an existing AC power line. The system includes a signal transmitter which can be plugged into an AC line socket, and which can operate to place a transient control signal on the AC power line. The system also includes a receiver which is connectable in series with a load to be remotely controlled, and which closes a switching circuit between the AC power line and the load when a switching signal on the power line is detected. The control signals are imposed on the AC line voltage by the transmitter only during an early time in a half-cycle of the power line voltage, before noise transient signals generally appear on the half-cycle, and the receiver is sensitive to control signals only during a corresponding portion of each half-cycle, thereby greatly reducing susceptibility of the switching system to noise on the power line.

Abstract: Apparatus for electrically burning information from an original document into stencil material comprising a stylus for applying electrical pulses to the material and an electrical circuit comprising an optical sensor for scanning information on the original and providing an output signal, the amplitude of which is proportional to the light reflected by the information, a circuit for providing a pulse train the shape of which conforms to the non-linear characteristics of the stencil material and a comparator for combining the output signal and pulse train to provide the electrical pulses having a width determined by the combination for application to the stylus, includes circuitry interposed between the optical sensor and the comparator for setting the minimum and maximum amplitudes of the output signals from the optical sensor representing tones to be reproduced as black and white, respectively.

Abstract: A keyboard encoding system having a pause built into the repeat key function. A multi-stage counter has a first of its stages coupled to a first bistable switching device and another, higher order stage coupled to a second bistable switching device. When a repeat key is closed, the counter is incremented past the first stage to the higher order stage which renders the second bistable switching device conductive and, due to the interconnection between the switching devices, primes the first bistable switching device. When the counter again increments to the first stage, the first bistable switching device conducts to produce, after the pause provided by the system, a repeat key encoding signal.

Abstract: A method and apparatus are disclosed for referencing the position of a rotatable drum in a scanner/plotter. The rotatable drum is rotatable held in axial alignment by means of a drum headstock and a spring loader, moving center tailstock. An optical shaft encoder provides a reference pulse for the headstock drum shaft and a plurality of drive shaft position pulses. The rotatable drum has a magnetic pellet mounted thereon. A magnetic transducer is positioned with respect to the predetermined drive shaft position to detect the presence of the drum pellet. As the drum rotates, the transducer detects the pellet and produces an output signal which is used to electronically cross-reference the drum pellet to the predetermined drive shaft position.

Abstract: There is described a simple first-in, first out (FIFO) magnetic bubble domain shift register which has continuous data storage capability. In a preferred embodiment, two parallel detector branches are associated with a main storage loop. The bubbles in the storage loop are replicated toward each detector branch by passive replicators in the storage loop. Annihilators associated with each of the replicators and each of the detectors are arranged an appropriate distance from the replicators so that selective energization of the annihilators permits certain bits to propagate to one detector and other bits to propagate to the other detector. Connection of the detectors in an appropriate bridge circuit permits full data rate reclamation.