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| Number | Title | Issue Date |
| 8185334 | Methods and systems for filtering a digital signal Aspects of the present invention are related to systems and methods for removing spikes and/or speckle noise from a digital signal. In some embodiments of the present invention, an input signal is filtered according to a first low pass filter. The low pass filtered ... | 05/22/2012 |
| 8184747 | Flexible timebase for EYE diagram A flexible timebase for eye diagrams uses a stable free running oscillator as a sample clock for equivalent time sampling of an input serial digital signal and of a reference signal derived from a subdivided recovered clock of the input serial digital signal. The re... | 05/22/2012 |
| 8184608 | System and method for using CDMA PN offset to maintain instrument timing reference A system and method is provided enabling identification of different PN offsets values for CDMA signals without access to a GPS signal, such as when making measurements within indoor environments. When a timing reference, such as that provided by a GPS signal, is lo... | 05/22/2012 |
| 8184163 | Methods and systems for detecting and locating skipped frames in a video sequence Embodiments of the present invention comprise methods and systems for detecting and locating skipped frames in a test video sequence in relation to a reference video sequence. Some embodiments comprise identifying pairs of temporally aligned reference and test segme... | 05/22/2012 |
| 8184121 | Methods, systems, and apparatus for multi-domain markers Embodiments of the present invention comprise methods, systems, and apparatus for multi-domain markers. ... | 05/22/2012 |
| 8180586 | Amplitude discrimination using the frequency mask trigger A frequency mask trigger having frequency selective amplitude discrimination capability is provided for triggering when selected frequency components of an input signal fail to reach a desired power level. A frame of digital data representing an input signal is tran... | 05/15/2012 |
| 8179443 | Waveform display apparatus and method A waveform display apparatus that can display a waveform in a desired position even when an internal reference mode is switched to an external reference mode. The internal and external reference modes are switched with a reference select button 60. A user ope... | 05/15/2012 |
| 8179305 | Enhanced impulse response measurement of an FM radar transmitter pulse An enhanced impulse response measurement for a pulsed frequency modulation (FM) radar signal provides a more accurate measurement of the amplitude of a secondary response relative to the amplitude of a main response. The pulsed FM radar signal is sampled to produce ... | 05/15/2012 |
| 8179118 | Wide-bandwidth spectrum analysis of transient signals using a real-time spectrum analyzer A system and method for performing wide-band spectral analysis of transient signals using a real-time spectrum analyzer (RTSA). A frequency window is selected for RTSA acquisition, the frequency window being narrower in bandwidth than the frequency spectrum of inter... | 05/15/2012 |
| 8164503 | Data converter system that avoids interleave images and distortion products A data converter system provides an output signal having reduced spurious tones by confining an input signal to a specified frequency band and over-sampling so that the converted input signal “straddles” or “avoids” spurious tones. The spurious tones may the... | 04/24/2012 |
| 8067718 | Method and apparatus for probing A probe comprises a small “consumable” probe substrate permanently mounted to a circuit-under-test. The probe substrate includes a high-fidelity signal pathway, which is inserted into a conductor of the circuit-under-test, and a high-bandwidth sensing circuit wh... | 11/29/2011 |
| 8055226 | Frequency response correction for a receiver having a frequency translation device A method of correcting the frequency response of an RF receiver having a frequency translation device and a fixed IF frequency section uses calibration data representing frequency responses over a wide frequency range for multiple center frequencies. The calibration... | 11/08/2011 |
| 8054331 | Systems and methods for generating video test sequences based upon captured video data A video test system is provided with a circular buffer to capture a video input sequence in response to a trigger, and a test generator output to generate a video test sequence based upon the captured video test sequence. The system may be implemented using a single... | 11/08/2011 |
| 8023558 | Method and apparatus for measuring the input frequency response of a digital receiver A frequency response measurement circuit includes a generation circuit operative to provide an input signal having a voltage and programmable frequency characteristics in response to a frequency control signal. A decision circuit is coupled to the generation circuit... | 09/20/2011 |
| 7995647 | Apparatus and method for evaluating propagation path conditions A measurement indicator, “transfer efficiency,” is provided for evaluating conditions of propagation paths of wireless communication systems having a plurality of transmitting and receiving antennas. Transfer functions of signal paths are calculated from data of... | 08/09/2011 |
| 7995149 | Subjectively weighted noise measurement Subjectively weighting noise measurements for multiple video formats based upon a defined standard for a standard definition video format uses a ratio between the active line time for the standard definition video format and the active line time for another video fo... | 08/09/2011 |
| 7978933 | Systems and methods for robust video temporal registration A robust video temporal method for registration between test and reference video sequences without a priori knowledge of the respective signal parameters initially produces frame and subimage distillation measurements from the test and reference video sequences. The... | 07/12/2011 |
| 7945407 | Signal analyzers and frequency domain data production methods Sets of time domain data of respective frequency bands from Fd-1 to Fd-n of a periodic input signal Fs are acquired. Sets of the time domain data of the common frequency band are extracted from the sets of the time domain data of the frequency bands Fd-1 | 05/17/2011 |
| 7920990 | Apparatus and methods of defining spectral regions of interest for signal analysis Apparatus and methods are provided to allow multiple, possibly overlapping, regions of interest within a frequency spectrum to be defined, and managed. Each of these regions of interest may be selected for further testing or identification. Unselected regions are al... | 04/05/2011 |
| 7920743 | Displaying time sequence of 2-dimensional data A method of displaying a time sequence of 2-dimensional data represents each data set in the time sequence as a normalized figure based upon a reference set of data. The perimeter of the normalized figure is color coded to represent deviations from a data standard t... | 04/05/2011 |
| 7894419 | Activity display for multiple data channels over period of time An activity display for multiple data channels over a period of time for a communication link provides a quasi-three-dimensional presentation having time periods and data channels as orthogonal axes and shading within each time period/data channel rectangle represen... | 02/22/2011 |
| 7889211 | Measuring PSNR of full color video A method of measuring peak signal to noise ratio (PSNR) of full color video, both total and component contributions as well as providing PSNR full color and component maps includes converting the components of the full color video for both reference and impaired vid... | 02/15/2011 |
| 7889198 | Display method for signal analyzer A rectangle marker on a display of a signal analyzer simultaneously designates time and frequency intervals of data from a signal under test for analysis. The data of the signal under test is displayed as a graph having time and frequency axes. Sub-graphs show data ... | 02/15/2011 |
| 7873486 | Spectrogram mask trigger A spectrogram mask trigger is generated in response to multiple or complex frequency events within a signal being monitored. A sequence of frequency masks over a period of time is generated according to a frequency trajectory, frequency hops or other complex frequen... | 01/18/2011 |
| 7868664 | Generating a trigger from a differential signal A trigger circuit generates a trigger signal when a differential input signal crosses a differential threshold voltage level. A first side of the differential input signal is applied to a first terminal of a first load termination resistor. A second side of the diff... | 01/11/2011 |
| 7816904 | Modulation signature trigger A trigger generator and trigger method are provided for determining whether or not a signal under test matches a modulation signature. The modulation signature may be provided as a magnitude signature, a phase signature or both. When the magnitude values, phase valu... | 10/19/2010 |
| 7778315 | Measuring instantaneous signal dependent nonlinear distortion in response to varying frequency sinusoidal test signal A method of measuring instantaneous signal-dependent nonlinear distortion in a system under test in response to a test signal having a varying frequency sinusoidal component, such as a swept frequency signal or a multi-burst signal, uses a time window to locate a fr... | 08/17/2010 |
| 7777659 | Analog to digital conversion system While combining AD converters that one is wide band but narrow dynamic range and the other is narrow band but wide dynamic range, it allows settings to provide a common intermediate frequency signal to the AD converters. A first BPF 50 provides a first AD con... | 08/17/2010 |
| 7765086 | Modulation domain trigger A modulation domain trigger generator demodulates a modulated input signal to extract information content, and a trigger is generated from the extracted information content in response to specified trigger criteria. The modulation domain trigger generator may be com... | 07/27/2010 |
| 7756192 | Despreading of modulated signals with low noise A method of despreading modulated signals with low noise to demodulate a sum of spread signals from a base station of a mobile phone system provides the sum of spread signals to several paths. A despreading circuit in each path despreads the sum of spread signals by... | 07/13/2010 |
| 7751470 | Time correlation of signal power to distortion characteristics 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 freque... | 07/06/2010 |
| 7734464 | RF autocorrelation signal trigger generator 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 predetermine... | 06/08/2010 |
| 7720137 | Characterization of a frequency response for a frequency translation device 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... | 05/18/2010 |
| 7702305 | Use of a preselection filter bank and switched local oscillator counter in an instrumentation receiver 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 os... | 04/20/2010 |
| 7697634 | Interpolation of complex signals 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 ... | 04/13/2010 |
| 7671856 | Measuring timing parameters of RGBHV analog video A unique test pattern is used for measuring timing parameters of RGBHV analog video signals. For horizontal timing a horizontal line includes within an active video region left and right portions at a first level and a central portion at a second level, the left, ri... | 03/02/2010 |
| 7649930 | Filter equalization using magnitude measurement data A filter equalization technique for an analog signal path, such as in an instrument that simultaneously measures a signal over a band of frequencies, uses magnitude measurement data for high frequency bands for which phase-calibrated sources are not readily availabl... | 01/19/2010 |
| 7646723 | Protocol test device having at least two channels A protocol test device has at least two channels which each have a transmit and a receive side, the protocol test device being designed to switch a signal transmitted from a first channel to the receive side of a second channel. A method for determining, by approxim... | 01/12/2010 |
| 7610161 | Wander gamut display A wander gamut display for perturbation analysis is created by determining from a periodic input data signal and a reference clock a frequency offset and frequency drift rate for the input signal. The frequency offset and frequency drift rate are input to respective... | 10/27/2009 |
| 7586515 | Instrument for real-time video quality measurement A realtime video quality measurement instrument may be configured for both double-ended and single-ended operation. For double-ended operation reference and test video signals are stored in respective buffers and spatial/temporally aligned. Desired quality measureme... | 09/08/2009 |
