Abstract: A detection system includes a first sensor configured to send a first ultrasonic pulse toward an object in a blowout prevention system. The first ultrasonic pulse has a first parameter. The detection system also includes a second sensor spaced from the first sensor and configured to send a second ultrasonic pulse toward the object. The second ultrasonic pulse has a second parameter that is different from the first parameter of the first ultrasonic pulse. The first parameter and the second parameter are one of an amplitude, a frequency, a duration, an emission time, and an excitation code. The second sensor is further configured to receive the first ultrasonic pulse after the first ultrasonic pulse interacts with the object. The detection system is configured to determine that the first ultrasonic pulse received by the second sensor was sent by the first sensor.

Abstract: A vertical deflection apparatus supplies a vertical deflection current to a vertical deflection coil to deflect an electron beam in the vertical direction of a screen. The apparatus includes: a vertical deflection current output circuit that outputs a vertical deflection current; a correction circuit that outputs a correction signal periodically changing in a parabolic shape in a horizontal scanning period to correct a north-south pincushion distortion; a modulation circuit that modulates the phase of the correction signal output from the correction circuit in a vertical scanning period; and a superimposition device that superimposes a correction current based on an output signal of the modulation circuit on the vertical deflection current.

Abstract: A pattern recognition system to qualify valid triggering for digital storage oscilloscopes. Valid trigger qualification may be established from recognition of triggering level and interval time information, as well as other pattern-related information, to start or stop waveform acquisition. Trigger qualification may be established from either a pattern match or a mismatch. The trigger recognition system may be further extended to the occurrence of complex signals, such as those associated with television, rotating machinery, or other phenomena occuring in predetermined or known patterns.

Abstract: A method and apparatus for configuring and performing processing in a digital oscilloscope. The method comprises the steps of receiving one or more instructions and defining a plurality of processing elements based upon the received instructions. The plurality of processing elements is connected to define a processing web for performing a desired processing. The plurality of processing elements is synchronized to generate a synchronized result.

Abstract: In a convergence adjusting apparatus, there are generated waveform signals for adjustment, each level of which becomes zero at a plurality of adjustment points on a display except for one adjustment point. The levels of the waveform signals for adjustment are adjusted in accordance with convergence adjusting signals, and a convergence deflection yoke is supplied with the waveform signals having adjusted levels. In the convergence adjusting apparatus, only a beam spot at any adjustment point subjected to adjustment is moved when convergence adjustment is effected, without affecting adjustment for other adjustment points.

Abstract: Horizontal or vertical parabolic waveforms corresponding to arbitrary aspect ratios are generated with a relatively small number of memory devices for storing data values which are used for generating parabolic waveforms to compensate horizontal or vertical deflection distortion in television receivers. A first and second memory device which each store data values for generating parabolic waveforms necessary for the images of a specific aspect ratio (for example (4:3) and (16:9)) are provided. When a desired aspect ratio is given to a logic circuit, two coefficients are calculated in a coefficient arithmetic logic unit and the outputs of the first and the second memory devices are allocated proportionally in a logic circuit. The output data values of the logic circuit are then converted to a desired parabolic waveform.

Abstract: System for controlling the position and intensity of an electron beam in a display tube of a display unit in such a manner that both analog signals as well as alphanumeric characters can be made visible simultaneously on the screen of the display tube.

Abstract: A triggering control circuit varies a holdoff period for one sweep cycle whereby to lock triggering to a different, selected event viewable on an oscilloscope.

Abstract: A delay time between the start of a trace on an oscilloscope screen and a point along the trace is computed based on measured "sweep gain" and "sweep start" parameters characterizing a triggered sweep signal controlling the horizontal position of an electron beam creating the trace, the sweep signal increasing when triggered from a starting level at a constant slew rate to move the beam at a constant speed across the screen. The sweep start parameter is the value of input data applied to a digital-to-analog converter (DAC) which would cause the DAC to produce an output voltage equal to the sweep signal starting level, and the sweep gain indicates the rate of increase in DAC input data required to produce a DAC output signal with a rate of increase similar to the slew rate of the sweep signal. The horizontal position of the point along the trace is the beam position on the screen at the moment the sweep signal magnitude reaches the magnitude of the DAC output signal.

Abstract: In a multiple trace oscilloscope wherein separate traces displayed on a cathode ray tube screen are updated in succession, a random access memory is addressed by the count output of a programmable counter which increments its count each time the oscilloscope finishes updating one trace prior to updating a next trace. Data stored in the random access memory at the storage location addressed by the count is utilized to control attributes of the next trace to be updated by controlling the switching positions of attribute control switches which select the horizontal, vertical and intensity control signals controlling the appearance of each trace.

Abstract: A method for automatically expanding and displaying a narrow pulse on an oscilloscope screen. The time sweep signal of the oscilloscope is first set to contain a predetermined number of input signal cycles. The speed of the time sweep is increased by an internal controller a number of settings to expand the signal cycle by a factor sufficient to place less than a single signal cycle within the sweep signal and an expanded singal pulse of greater than a specified duty factor outside the sweep signal. The dual trigger generators of the scope are set to trigger on opposite slopes of the pulse. If both trigger generators trigger, then the pulse is within the specified duty factor and the controller directs it to be displayed on the oscilloscope screen in its expanded form. The specified duty factor can be made exact by adjusting the duration of the sweep signal to match the duration of the duty factor once the period of the signal cycle is determined.

Abstract: An oscilloscope vertical amplifier with Boolean combinatorial trigger generator capability is disclosed. While the display output is fully analog, the trigger output to the time base is digital with a user selectable Boolean function of the analog input signals. Also included is nested triggering, edge as well as level sensitivity, and a trigger filter to selectively inhibit high frequency events. The delay times of the analog and digital signal paths are matched by means of analog delay lines before presentation by a visual display to present the analog and digital signals in time coincidence to the oscilloscope main frame.

Abstract: A multiplexed display interference compensation system for minimizing the apparent intensity modulation of an oscilloscope waveform display caused by closely spaced, individually imperceptible interruptions of the waveform required to maintain refreshed readout display is provided. The system includes a charge pump circuit for adding a current pulse to a waveform intensity control signal in response to a control signal from display multiplex control so as to increase the waveform intensity just after the interruption.

Abstract: An oscillographic device receives plural vertical inputs which are multiplexed to provide plural traces by means of the same electron beam. Switching times of the multiplexer are varied during the display to avoid gaps in waveform presentation when the period of the device's horizontal sweep is a near multiple of the switching period of the multiplexer.

Abstract: An oscilloscope is provided with a dual time base system in which the nonlinear startup segment of the main sweep is eliminated before delay time comparison, thereby facilitating accurate differential measurements down to and including the triggering event (zero time). System delays are built in to ensure that the displayed sweep trace also begins at the left edge of the viewing screen, and, moreover, the triggering event may be viewed on both the main and delayed sweeps. The built-in system delays may be programmable to facilitate delay matching of vertical channels or time matching of independent sweep operation.

Abstract: In an alternating sweeping system for use in an oscilloscope of the type wherein a sweeping signal and a delayed sweeping signal are alternately supplied to a horizontal deflection circuit of the oscilloscope, and wherein a unblanking signal and a delayed unblanking signal are alternately supplied to a brightness modulation circuit, widths of the delayed sweeping signal and the delayed unblanking signal made to be less than one half of width of the sweeping signal and the unblanking signal so that the delayed blanking signal and the delayed unblanking signal are used a plurality of times during an interval in which the sweeping signal and the unblanking signal are used once.

Abstract: A waveform comparison and display system using a cathode ray tube, which is provided with a digital memory function for sequentially storing input signal levels in digital quantities and re-reading them out under control of desired clock pulses and with a display function for displaying on the cathode ray tube two waveforms obtained in outputs produced by high-speed switching of the input signal and an analog signal re-read out. The storing operation and the sweep operation of the cathode ray tube are controlled by a trigger signal synchronized with the input signal. The generation of the clock pulses is start-stop controlled in synchronism with the sweep. Accordingly, the two waveforms are displayed on the screen of the cathode ray tube in such a manner that they are stationary with respect to each other.

Abstract: An apparent zero delay of a trigger view signal with respect to a normal vertical signal in an oscilloscope is provided by horizontally shifting the trigger view display to coincide with the normal vertical display. This is achieved by injecting a predetermined offset current into the sweep sawtooth output amplifier only when the trigger view signal is being displayed.

Abstract: An improved delayed sweep system is disclosed for an oscilloscope having main and delayed sweeps. A trigger pickoff circuit has means for providing a pair of pre-selected trigger pickoff points on the delaying sweep so that delayed sweeps may be generated in accordance with the two points selected. An alternating display mode facilitates presentation of the delaying sweep and both delayed sweeps in a single display, with the relative time positions of both delayed sweeps appearing on the delaying sweep as a pair of intensified zones. Either delay time measurement between the sweep start and a point of interest on the display, or differential time measurement between two points of interest on the display may be made. Voltages proportional to the selected time measurement may be applied to a properly scaled digital voltmeter to provide a direct readout in units of time.

Abstract: An oscilloscope has an additional vertical display mode to enable the display of the trigger signal, activating the sweep generating circuit, simultaneously with the display of the normal vertical channels. The triggering source, level, slope and subtle time relationships can be verified and examined continuously and concurrently with the measurements upon the normal vertical channels. The displayed trigger signal is in correct time relationship with the normal vertical channels and the trigger level threshold is identified.

Abstract: According to one embodiment, distinctive indicia having a "three-dimensional" appearance and representative of well logging data is produced by a CRT (Cathode-ray tube) recorder by modulating both the intensity and position of the sweeping electron beam in response to variations in the data. In another embodiment, distinctive indicia in the form of a vector or arrow representative of the data is produced by sweeping the CRT electron beam in such a way that it defines an increasing spiral pattern. The electron beam is then turned on for a short pulse at the same angular position of each cycle of the spiral. For purposes of synchronization, in each of the above embodimens the beam sweep is initiated by a recurring event, such as a pulse indicative of a given incremental change in the depth level from which the data was device.

Abstract: Two (or more) periodically reproducible input signals V.sub.yI, V.sub.yII, possibly including a constant reference signal, are visually displayed on an oscilloscope screen with the aid of a normally suppressed electron beam under the control of a horizontal-sweep generator and a vertical-sweep generator producing a sinusoidal x-deflection and y-deflection signals V.sub.xR and V.sub.yR, respectively. The x-deflection signal V.sub.xR is continuously compared with two (or more) ramp signals V.sub.xI and V.sub.xII, of different periodicities substantially lower than the frequencies of the deflection signals, respectively assigned to the input signals V.sub.yI, V.sub.yII to be displayed; upon the occurrence of a coincidence with one of these ramp signals, the horizontal sweep is halted or slowed down -- preferably to the slope of the coincident ramp signal -- for a display interval equaling one cycle of the y-deflection signal V.sub.

Abstract: A multiple-line display signal generating apparatus is disclosed in which each of a plurality of lines is generated in a normally fixed raster format, wherein any one of the plurality of lines may be selected and positioned wiith respect to the other lines. Programmed current generators provide a fixed displacement current for each line, and a variable displacement current may be selected to replace any of the fixed values.

Abstract: A dual trace display device having a gate circuit for receiving input signals, a sweep signal generator, a rectangular waveform generator supplied with the output signal from the sweep signal generator, and a driving circuit supplied with the output signal from the rectangular waveform generator and controlling the gate circuit. In this case, a display device is supplied with the output signals from the gate circuit and the sweep signal generator for displaying the same thereon.