Abstract: Time correlation of signal to distortion characteristics is achieved by acquiring time domain data for a frequency band representing a communication signal, the communication signal having multiple channels. The time domain data is simultaneously converted to frequency and demodulation domain data in sequential time blocks. The frequency and demodulation domain data are processed to obtain respectively frequency and demodulation domain measurements. The resulting measurements are displayed simultaneously as a function of time for all the time blocks and/or for a selected one of the time blocks. An ACLRogram display provides a display having a time axis and a frequency axis in the form of bars spanning the frequency band for each time block with each bar being divided into frequency sub-bands representing a main channel and adjacent side channels, the shading of each segment of the bar representing a measurement value for that segment.

Abstract: A sequential equivalent-time sampling oscilloscope simultaneously acquires samples of a signal-under-test and a reference clock that is asynchronous with the signal-under-test. The oscilloscope converts the samples of the reference clock into timestamps and uses the timestamps to compensate for the jitter of the oscilloscope and to indicate the absolute jitter of the signal-under-test.

Abstract: Embodiments of the invention include systems and methods for predicting video quality through human vision perceptual color response and associated perceptual differences of video relative to a reference. Embodiments include a model of the human vision system developed as an extension to CIECAM02 to predict the macro-behavioral response to light stimuli with the following varying parameters, in addition to the parameters relevant to CIECAM02: spatial frequency, temporal frequency, angular extent, temporal extent, and surround.

Abstract: Embodiments of the invention include systems and methods for automatically detecting persons and/or other objects in a video signal. Automatic color compensation is applied to the video signal based on measured color of a reference area of the video signal. Generally the reference area is an area of the video signal that does not change often over time. The color compensated video signal is then analyzed for the appearance of objects and persons. In some instances the persons are identified using facial or other type of recognition. Counters or other trackers may provide real-time information, such as how many people are currently on a particular floor of a building.

Abstract: The apparatus for a test and measurement instrument consists of multiple integrated circuits with each integrated circuit being connected to its own memory controller. At least one of the integrated circuits is a specialized integrated circuit, which may be a graphics processing unit, a digital signal processor, or a field-programmable gate array. Each memory controller is connected to its own memory. The integrated circuits are connected in a circular arrangement by multiple high-speed interconnects. A bridge is connected to at least the first and last integrated circuits. A system bus connects the bridge to an acquisition module. The acquisition module has a signal bus interface with the system bus being connected to the acquisition module and having its own acquisition hardware. The acquisition hardware is a direct memory access machine that can transfer data to any portion of the memory. There is a signal source connected to the signal bus interface.

Abstract: An autocorrelation trigger comprising a correlator detector for producing a correlation coefficient by correlating a signal with a time-delayed version of the signal and generating a trigger in real-time when the correlation coefficient corresponds to a predetermined condition is provided. A method of producing trigger based upon an autocorrelation measurement is also provided. The autocorrelation trigger may be used to produce a trigger based upon the degree to which the autocorrelation relates to an autocorrelation model, such as, the degree of randomness in a signal.

Abstract: Selectable portions of a display on a display screen allow a user to select bits of a digital signal. A mode selection menu changes the bit selection to select bits in different ways. If an individual bit designation mode is selected, objects are displayed that correspond to the respective bits of the digital signal. A user selects the object corresponding to a desired bit by use of a mouse. After bit selection, an eye pattern, derived from only selected bits, is displayed. Additionally, jitter analysis results derived from only the selected bits are displayed.

Abstract: A self-adjusting hold-off trigger circuit and method detects a threshold crossing between consecutive samples of a digitized input signal as edge events, identifies the crossing as a qualified trigger event if the crossing is in a desired direction based upon trigger criteria, and provides a trigger output when the qualified trigger event occurs greater than an approximate average or peak time after a preceding edge event.

Abstract: A method of characterizing the frequency response of a frequency translation device over a wide IF bandwidth is based on a two-dimensional model to generate calibration data for a device at run-time. The model is a function of a center frequency and frequency offset for a plurality of center frequencies over a wide system bandwidth to produce a frequency response at each center frequency. The frequency responses at each center frequency are scaled and normalized relative to a reference frequency and stored.

Abstract: A measurement system including a plurality of test and measurement instruments; and a hub coupled to each of the test and measurement instruments. Each of the test and measurement instruments is configured to trigger an acquisition in response to a hub event received from the hub. Acquisitions can be triggered from one, some, any, or all of the test and measurement instruments.

Abstract: An electrical contact assembly has a plurality of formed elongate closed seam tubular elements attached to a carrier with each of the elongate tubular elements attached to the carrier via a tab. Scored creases are formed in the tabs for separating the elongate tubular elements from the assembly and scored creases are formed in the carrier for defining carrier strips. The carrier strip had a plurality of grouped elongate tubular elements. The electrical contact assembly is placed in a crimping die where at least one or more wires are inserting into selected elongate tubular elements. Pressure is applied to least one or more of the selected elongate tubular elements to produce bulk material deformation along a substantial portion of the elongate tubular elements to crimp the elongate tubular elements to the wires as electrical contacts.

Abstract: A test and measurement instrument and method of switching waveform display styles includes acquiring an electrical signal, storing peak detect data samples from the electrical signal to one or more memory devices, storing filtered data samples or unfiltered data from the electrical signal, automatically switching to a first waveform display style having the peak detect data samples configured in a first mode when a user selects the unfiltered data, and automatically switching to a second waveform display style having the peak detect data samples configured in a second mode when the user selects the filtered data samples.

Abstract: An instrumentation receiver architecture for processing an RF signal has a dual-IF channel architecture, a low-band IF channel and a high-band IF channel, and a tunable oscillator, such as a yttrium-iron-garnet (YIG) tunable oscillator (YTO), a voltage controlled oscillator (VCO), a bank of VCOs and the like, providing a different mixing frequency range to each channel, generally a higher frequency range to the high-band IF channel than to the low-band IF channel. At the input to the high-band IF channel is a bank of preselection filters for selecting a frequency band from the RF signal for processing by the high-band IF channel. A switch selects the output from one of the low-band and high-band IF channels for further processing.

Abstract: An improved interpolation technique for reconstructing a complex signal from sampled data estimates a carrier phase for each sampled data time. The carrier phase is then used to compensate for frequency variation in the complex signal. The complex components of the sampled data are then interpolated separately with the interpolated results being used to produce an interpolated magnitude that is the reconstructed complex signal.

Abstract: An equalization simulator with training sequence detection uses an oscilloscope to acquire digital samples of an analog waveform signal from a serial data link to produce a digitized waveform record. The equalization simulator has training sequence detection receiving the digitized waveform record and generates a training sequence, an equalization adapter receiving the digitized waveform record and the training sequence and generating equalizer taps, and an equalizer receiving the equalizer taps and the digitized waveform record and generating an equalized digitized waveform record.

Abstract: A plurality of RF signals are generated with the RF signals synchronized with each other with high accuracy. Transmission data of the multiple channels are modulated, the modulated data of the channels are added to produce composite data and the composite data is stored in a data storage device. In the modulation process, the carrier frequencies are different from each other. The composite data comprises the data of the channels modulated in the frequency division multiplexing manner. The composite data is converted into an analog composite signal by a D/A converter and this analog signal is upconverted to an RF frequency by a frequency conversion circuit. A signal separation circuit produces two channel signals from the RF frequency signal. A signal output circuit generates the output signals having desired frequencies and signal levels.

Abstract: An adjustable probe head consists of a probe head enclosing a plurality of test paths with a header that is attached to one of its opposing sides and electrically connected to the test paths. The header may be removably attached to the probe head. The probe head may enclose a board with an attached integrated circuit unit, and there may be a power cable and a signal cable connected to the board. There may be a clip that removably retains the probe head by releasably engaging with at least one of a plurality of slots on the sides of the probe head. The invention also includes a method of acquiring signals from an electrical device mounted on a test board. The electrical device may be a double data rate memory module.

Abstract: The present invention relates to a circuit arrangement with which a communication that is subdivided into functional layers is processable by a first layer for a higher layer and/or by a higher layer for the first layer, the first layer being formed by a physical layer and the circuit arrangement featuring at least one port which allows a communication directly with a layer that is higher than the first layer without the communication previously having to pass through the first layer.

Abstract: On a test apparatus for a telecommunication network a plurality of quality rules are defined as a function of the results of counts of events for a plurality of test parameters. The events relating to the plurality of test parameters during the performance of a test are counted. A plurality of statistics are created from the results of the counts. The statistics and quality rules which belong together are compared. A display is generated on a display unit in accordance with the results of the comparisons showing success or failure for each test run. Details of errors that caused any failure may be displayed using a drill-down technique so that test runs may be run rapidly without requiring expert knowledge of the test apparatus.

Abstract: A method and protocol tester for decoding data for the performance of a measurement task, which data is encoded in accordance with a protocol description, includes modifying the protocol description with respect to the measurement task by compressing protocol elements that are of no relevance to the measurement task and decoding the encoded data according to the modified protocol description to provide only decoded data relevant to the measurement task. The decoded data may be filtered before further processing according to a filter condition determined by the measurement task. Alternatively the filter condition may be installed as part of the modified protocol description. Then additional filtering may be applied when there are further filter conditions determined by the measurement task. The result is a protocol tester that permanently stores the protocol description while allowing modification of the protocol description for each measurement task, reducing storage and calculation requirements.