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| Number | Title | Issue Date |
| 8179119 | Charge sampling device and method The invention relates to the sampling of temporally changing amounts of charge (102) by receiving varying amounts of charge (102) varying as a function of time, transforming the varying amounts of charge received into a linear distribution pattern, sam... | 05/15/2012 |
| 8008906 | Prime-based frequency sampling Various embodiments provide methods, apparatuses, and systems for sampling a waveform using relatively prime sampling methods. A waveform with a first plurality of cycles and a first frequency may be sampled with a waveform sampling device. Sampling the waveform may... | 08/30/2011 |
| 7723976 | Self-adjusting hold-off trigger 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 trigge... | 05/25/2010 |
| 7719256 | Method for determining a separation time A method for determining a time interval between leading edges of two adjacent cyclic input pulses of a series of cyclic input pulses. A sample of the cyclic input pulses is taken at each of a series of sampling times to produce sampling hits, each sampling hit bein... | 05/18/2010 |
| 7642766 | Method and device for measuring with synchronous detection and correlated sampling The invention relates to electronic circuits for measuring, by synchronous detection, weak signals whose reference level is not well known and is subject to large fluctuations. A first correlated double sampling is performed between a time T1 situated just be... | 01/05/2010 |
| 7401007 | Method, computer program and apparatus for extracting large size signal data samples with an automatically adjusted decimation ratio A method for rapidly extracting data file samples with an a signal monitor and an automatically adjusted decimation ratio is provided to solve the long-standing problems caused by large data files and small buffers by reducing a large data segment to a smaller, more... | 07/15/2008 |
| 7373263 | Analog-type measurements for a logic analyzer A logic analyzer that performs analog-type measurements on digital data includes circuitry in its acquisition system that is programmable to search through acquired data to detect analog-type signal characteristics. In a first embodiment, the logic analyzer includes... | 05/13/2008 |
| 7285948 | Method and apparatus providing single cable bi-directional triggering between instruments System and apparatus enabling the use of a single cable to communicate triggering information between each of a plurality of signal acquisition devices and, illustratively, an external trigger control unit. A combined tripper signal is produced only when each trippe... | 10/23/2007 |
| 7285946 | Pattern trigger in a coherent timebase A method and apparatus for acquiring a signal employing a coherent timebase are provided. The method comprises the steps of defining a pattern length count of a repetitive pattern in a signal to be acquired, defining a number of samples per unit interval, and provid... | 10/23/2007 |
| 7248980 | Method and apparatus for removing quantization effects in a quantized signal One embodiment of the present invention provides a system that reconstructs a high-resolution signal from a set of low-resolution quantized samples. During operation, the system receives a time series containing low-resolution quantized signal values which are sampl... | 07/24/2007 |
| 7248991 | Method and device for detecting a rotational speed, especially the rotational speed of the wheel of a vehicle The invention relates to a method and an apparatus for measuring a rotational speed, in particular a rotational speed of a wheel of a motor vehicle, by means of a speed sensor, wherein the speed sensor produces an output signal characterizing the actual rotational s... | 07/24/2007 |
| 7239988 | Apparatus and method for efficient representation of periodic and nearly periodic signals for analysis Apparatus for graphically representing a substantially periodic signal having substantially periodic segments, comprising a graphic transformer for converting the periodic segments into encodings respectively for arrangement in a first dimension and successively ind... | 07/03/2007 |
| 6968277 | Power line monitoring and interrupt method and apparatus In order to detect high-speed transients in the alternating current of a power distribution system, the rate at which the power on the distribution system is sampled is increased so that even high-speed transients are detected. The sampling rate can be increased in ... | 11/22/2005 |
| 6832174 | Method and apparatus providing interleaved data from multiple signal acquisition devices A system comprising a plurality of digital storage oscilloscopes (DSOs) in which each DSO acquires a common signal under test (SUT) according to respective clock signals having common frequency parameters and respective phase parameters such that a plurality of acqu... | 12/14/2004 |
| 6703820 | Method and circuit for testing high frequency mixed signal circuits with low frequency signals A sampling circuit for use in testing an analog waveform includes a sampling switch for sampling an analog waveform, a sample storage capacitance including a single capacitance and a plurality of capacitances selectably connected in parallel; and a sampli... | 03/09/2004 |
| 6650101 | Timebase for sampling an input signal having a synchronous trigger A timebase establishes the timing of samples acquired by a signal sampler relative to a trigger signal that is synchronous with an input signal applied to the signal sampler. The synchronous trigger activates a first pair of samplers included in the timeb... | 11/18/2003 |
| 6630820 | Method and apparatus for measuring the instantaneous frequency of FM signals A method and an apparatus for measuring the instantaneous frequency of FM modulated signals, includes sampling, instantaneous frequency computing, and lowpass filtering. FM modulated signal are sampled at prescribed intervals to provide digitized FM signa... | 10/07/2003 |
| 6593727 | Data processor and data processing method for wavemeter The CPU outputs to the delay circuit 22 delay time setting signals for setting the delay time, based on input delay time data input from an external input device. The delay circuit 22 re-sets the delay time via new delay setting signals input from the CPU... | 07/15/2003 |
| 6541952 | On-line cancellation of sampling mismatch in interleaved sample-and-hold circuits The present invention relates to a high speed sample and hold circuit having a plurality of sample and hold subcircuits coupled in parallel between an input and an output. The circuit also having a calibration sample and hold subcircuit coupled to the plu... | 04/01/2003 |
| 6493024 | Signal monitoring apparatus A digital video signal monitoring apparatus comprises means (2,4,6) for receiving a digital video signal and extracting therefrom a plurality of digital signals, each of which comprises a plurality of successive digital sample values. The apparatus furthe... | 12/10/2002 |
| 6483286 | Method and apparatus for measuring the instantaneous frequency of FM signals A method and an apparatus for measuring the instantaneous frequency of FM modulated signals, includes sampling, instantaneous frequency computing, and lowpass filtering. FM modulated signal are sampled at prescribed intervals to provide digitized FM signa... | 11/19/2002 |
| 6442506 | Spectrum analysis method and apparatus A method and apparatus for spectral analysis of a sampled signal are provided. According to the method, a first time interval ƊT is determined which represents a sample set over which the signal can be averaged for purpose of decomposing the signal into ... | 08/27/2002 |
| 6157196 | Method for monitoring of tap changers by acoustic analysis A method for monitoring an on-load tap changer wherein the recording of sound and its conversion into a sound signal are initiated at the beginning of a connection operation of the tap changer and the sound signal is rectified, converted into a signal env... | 12/05/2000 |
| 5847558 | Periodic signal analyzer using a randomly varied phase shifting circuit A signal sampling circuit receives a clock signal indicative of a sampling rate and a periodic input signal to produce a digitized sampled output signal. The sampled signal is applied to an all-pass filter having a single pole/zero pair in which the pole/... | 12/08/1998 |
| 5828983 | Method and apparatus for processing a sampled waveform A method and apparatus are provided for approximation of integral and RMS values for waveforms of uncertain or unknown period. The technique employed processes values of the waveform sampled at fixed sampling intervals, monitors the actual period of the w... | 10/27/1998 |
| 5789913 | Method for analyzing and equalizing signals Equalizers, used for equalizing distorted signals, are calibrated with the aid of the so-called "eye" pattern on the oscilloscope. Data bits are traced with their edges above one another by triggering to the amplitude so that an "eye" opening is produced.... | 08/04/1998 |
| 5748303 | Light sensing device A light sensing device including at least one light sensor is provided. The at least one light sensor is configured to be exposed to a light image. In response to the light image, the at least one light sensor is configured to generate a first signal. The... | 05/05/1998 |
| 5740064 | Sampling technique for waveform measuring instruments A new sampling technique for waveform measuring instruments (including methods and circuits for implementing same) comprises the step of processing a series of digital signal samples through a decimator to extract a decimated sample value from each decima... | 04/14/1998 |
| 5610847 | Ratiometric fourier analyzer A ratiometric Fourier analyzer is provided for determining the frequency components of the output waveforms of electronic circuits by eliminating errors due to aliasing without increasing the time necessary for analysis. Ratiometric Fourier analyzers in a... | 03/11/1997 |
| 5576618 | Process and apparatus for comparing in real time phase differences between phasors A numerical comparator is disclosed. The numerical comparator employs numerical techniques based upon the behavior of the cylinder unit to compare phasors in real time. In one application of this invention, the torque signal generated by the numerical com... | 11/19/1996 |
| 5545976 | Gated spectrum analyzer A narrowband spectrum analyzer separates and analyzes a chosen segment of a periodic signal. The signal to be analyzed is digitized by an A/D converter. A gate generator is configured to trigger on a particular portion of the signal waveform and to identi... | 08/13/1996 |
| 5528134 | AC power analyzer A harmonic analyzer using a short sampling window eliminates truncation artifacts in the sampling of an AC power waveform by equating the length of the sample period to a period of the sampled waveform. The period of the AC power waveform is estimated fro... | 06/18/1996 |
| 5521512 | Time domain reflectometer using successively delayed test pulses and an interleaved sampling procedure A time domain reflectometer includes a clock signal source that synchronizes a Start pulse source which, in turn, generates a succession of Start pulses. Each succeeding Start pulse, after an initial Start pulse, is delayed in time from a preceding Start ... | 05/28/1996 |
| 5515300 | Coherent signal power detector using higher-order statistics A signal detection system divides a data sampling run into blocks and perms a fast Fourier transform on each block, sorting results by frequency. Combinations of results of the fast Fourier transform corresponding to each frequency are processed to deriv... | 05/07/1996 |
| 5481182 | Up/down spectrum scaling of signals A system for scaling down the spectrum of a composite signal by a factor in real time to a lower frequency, or for scaling up the spectrum of a composite signal by a factor in real time to a higher frequency is described. The spectrum up conversion and do... | 01/02/1996 |
| 5451956 | Instantaneous parameter measuring receiver A method and apparatus for processing the log video output of a receiver that can measure multiple time overlapped pulses on a nearly instantaneous basis. The receiver measures frequency, pulse modulation, time of arrival, amplitude, pulse width and phase... | 09/19/1995 |
| 5420501 | Frequency spectrum analyzer A frequency spectrum analyzer wherein an input signal is subjected to A/D conversion, and the converted data is multiplied by a window function; and the thus processed signal is subjected to Discrete Fourier Transform; when a user specifies a desired freq... | 05/30/1995 |
| 5323104 | Method and arrangement for demodulating a frequency modulated signal The invention relates to a method and to an arrangement for demodulating a signal (f) preferably frequency modulated with digital information, and then particularly a frequency shift modulated signal, with a frequency counter detector (16) which directly ... | 06/21/1994 |
| 5293520 | Jitter analyzer Periods Pk between the one edges of input pulses are measured one after another by a successive period measuring circuit, and at the same time, the time interval between the one edge to the other of each input pulse, that is, a pulse width W | 03/08/1994 |
| 5291140 | Mixed domain spectrum measurement method Aliasing and synchronization difficulties in determining transfer functions in mixed domain (analog and digital) systems are overcome by sampling the analog signal at a higher sampling frequency that the digital signal, and zero filling the set of sampled... | 03/01/1994 |
