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公开(公告)号：US20220113340A1
公开(公告)日：2022-04-14
申请号：US17500271
申请日：2021-10-13
IPC分类号： G01R23/167 , H04W24/10 , H04B1/00 , H04B17/391 , H04L27/00
摘要： A signal detection methodology is provided to determine from a waterfall image where the signal occurred on the frequency spectrum, when it occurred, and what type of modulation the signal is. The methodology includes converting a waterfall image into a first binary image version of the waterfall image; removing noise spikes from the first binary image version of the waterfall image; removing vertical gaps in the first binary image to thereby create an intermediate image version of the first binary image; converting the intermediate image version of the first binary image into a second binary image; identifying location parameters of a signal of interest within the second binary image; and isolating, using the identified location parameters, the signal of interest in the waterfall image to generate an isolated image of the signal of interest.
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公开(公告)号：US11209468B2
公开(公告)日：2021-12-28
申请号：US15978307
申请日：2018-05-14
发明人： Junjie Qiao , Yanji Chen
IPC分类号： G01R23/167 , A61B5/08 , H03M1/66 , H03M1/12 , A61B5/024 , A61B5/0507 , A61B5/00 , A61B5/11 , A61B5/113
摘要： An apparatus for detecting object features can include: a probe signal transmitter configured to load a digital intermediate frequency signal onto a carrier signal, and to transmit a loaded signal outwards; an echo signal receiver configured to receive an echo signal, and to extract an object feature signal by performing respective down conversions on a quadrature signal of the carrier signal and a quadrature signal of the digital intermediate frequency signal; and a signal processor configured to identify object features according to the object feature signal.
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公开(公告)号：US20210341522A1
公开(公告)日：2021-11-04
申请号：US17235422
申请日：2021-04-20
发明人： Andrew S. Wunderlich , Enrico Santi
IPC分类号： G01R23/167 , G06N20/00 , G06N5/04
摘要： Systems, apparatuses, methods and computer processes to separate and select frequency components of a signal in real time without phase delay by predicting or forecasting future values of the signal and using that forecast and past measurements in a noncausal zero-phase filtering algorithm are provided. The method of separating and selecting frequency components of a signal in real time without phase delay using a zero-phase filter, comprises obtaining past measurements of the signal; obtaining predicted values of the signal; and using the predicted values of the signal and the past measurements of the signal as components of an input signal in a noncausal zero-phase filtering algorithm for a zero-phase filter, the zero-phase filter producing an output signal.
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114.发明授权公开(公告)号：US11162987B2
公开(公告)日：2021-11-02
申请号：US15999409
申请日：2018-08-20
IPC分类号： G01R23/167
摘要： A method for separating spectrums of an input signal having a first spectrum and a second spectrum by mixing the input signal at a first mixer with a first frequency to obtain a first mixed signal; mixing the input signal at a second mixer with second frequency to obtain a second mixed signal; displacing the first mixed signal and/or the second mixed signal up and down by the difference of the first and second frequency obtaining at least one lower auxiliary signal and at least one upper auxiliary signal, respectively; and extracting the first spectrum and/or the second spectrum using the lower auxiliary signal and/or the upper auxiliary signal as well as the first mixed signal and/or the second mixed signal. Further, measurement devices for separating spectrums are shown.
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公开(公告)号：US11092630B2
公开(公告)日：2021-08-17
申请号：US16172892
申请日：2018-10-29
申请人： SHIMADZU CORPORATION
发明人： Tohru Matsuura
IPC分类号： G06F11/30 , G01R23/167 , G01R23/177 , G01R23/175 , G01N3/32 , G01N3/30
摘要： A signal processing method and a material testing machine are provided. A reference function processing part includes a data interval generation part for cutting out input signal from a load cell into time-domain data interval by cutting out the input signal of a predetermined time length, a reference function determining part for determining a reference function to be used in a transform process, and a transform part for transforming the interval data using the reference function. Considering the approximately straight lines near the two ends of the data interval, the reference function is a third degree polynomial function with tangents overlapping with the approximately straight line at both ends of the data interval.
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公开(公告)号：US20210199701A1
公开(公告)日：2021-07-01
申请号：US16729485
申请日：2019-12-30
发明人： Hsuan-Yu Lin
IPC分类号： G01R23/167
摘要： A sensing system and a sensing signal measuring method thereof are provided. The sensing system includes a signal source, a connecting device, a frequency sweep circuit, and a controller. In the method, the signal source is activated to generate a specific signal. The controller controls the frequency sweep circuit to switch a frequency band of a frequency sweep signal to a first frequency band corresponding to each of a plurality of types of multi-point sensors. The controller receives a sensor signal of each multi-point sensor through the connecting device, where the sensor signal is a variation of a measurement signal output by each multi-point sensor in response to the specific signal and the frequency sweep signal. The controller executes an adaptive algorithm on the sensor signal to construct a correspondence between an eigenvalue of each multi-point sensor and a location of the first frequency band, and records the correspondence.
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公开(公告)号：US10993676B2
公开(公告)日：2021-05-04
申请号：US15533892
申请日：2015-12-08
IPC分类号： A61B5/00 , A61B5/08 , A61B5/1455 , A61B5/083 , A61B5/024 , G01R23/167
摘要： A method and apparatus for estimating the frequency of a dominant periodic component in an input signal by modelling the input signal using auto-regressive models of several different orders to generate candidate frequencies for the periodic component, generating synthetic sinusoidal signals of each of the candidate frequencies, and calculating the cross-correlation of the synthetic signals with the original signal. The frequency of whichever of the synthetic signals has the highest cross-correlation with the original signal is taken as the estimate of the frequency for the dominant periodic component of the input signal. The method may be applied to any noisy signal which has a suspected periodic component, for example physiological signals such as photoplethysmogram signals, and in the estimation of heart rate and breathing rate from such physiological signals.
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公开(公告)号：US10962387B2
公开(公告)日：2021-03-30
申请号：US16650716
申请日：2018-09-28
发明人： Olivier Develle , Jean-Luc Manca
IPC分类号： G01D5/22 , G06F17/00 , G01R23/167 , G01D5/20 , G06F17/16
摘要： A method of measuring a movement, the method comprising the steps of: acquiring and digitizing both a first measurement voltage across the terminals of a first secondary winding and also a second measurement voltage across the terminals of a second secondary winding of an inductive movement sensor; multiplying the first measurement voltage by itself in order to obtain a first component of a crossed vector, multiplying the second measurement voltage by itself in order to obtain a second component of the crossed vector, and multiplying together the first measurement voltage and the second measurement voltage in order to obtain a third component of the crossed vector; applying the crossed vector as input to a lowpass filter in order to obtain a filtered vector, and estimating the movement from the components of the filtered vector.
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119.发明申请公开(公告)号：US20200057100A1
公开(公告)日：2020-02-20
申请号：US15999409
申请日：2018-08-20
IPC分类号： G01R23/167
摘要： A method for separating spectrums of an input signal having a first spectrum and a second spectrum by mixing the input signal at a first mixer with a first frequency to obtain a first mixed signal; mixing the input signal at a second mixer with second frequency to obtain a second mixed signal; displacing the first mixed signal and/or the second mixed signal up and down by the difference of the first and second frequency obtaining at least one lower auxiliary signal and at least one upper auxiliary signal, respectively; and extracting the first spectrum and/or the second spectrum using the lower auxiliary signal and/or the upper auxiliary signal as well as the first mixed signal and/or the second mixed signal. Further, measurement devices for separating spectrums are shown.
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公开(公告)号：US20200025812A1
公开(公告)日：2020-01-23
申请号：US16040662
申请日：2018-07-20
发明人： Markus FREIDHOF , Andreas MAIER
IPC分类号： G01R23/167 , G01R13/02
摘要： The present invention relates to a processing of digitally measured signals. When sampling a measurement signal with a predetermined sampling rate, aliasing effects may occur, if a Nyquist condition is violated. For this purpose, the present invention suggests to analyze a frequency spectrum of a signal and to compare the frequency components of the spectrum with the setting of a measurement apparatus, in particular a sampling rate of the measurement apparatus. If a measurement signal comprises frequency components which may violate the Nyquist condition, an alert may be generated to adapt the set of the measurement arrangement.
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