-
公开(公告)号：US20240142503A1
公开(公告)日：2024-05-02
申请号：US18493866
申请日：2023-10-25
发明人： Wei Wang , Michael Augustin , Jürgen Schäfer , Dietmar König , Josef Niederl , Shane O'Neill
IPC分类号： G01R23/167
CPC分类号： G01R23/167
摘要： According to various embodiments, a circuit for determining the frequency of a signal is described, comprising an input configured to receive an analog input signal, an analog to digital converter configured to convert the analog input signal to a digital input signal, a digital mixer configured to generate a mixing result signal by mixing the digital input signal with a single bit binary signal having a reference frequency, a low pass filter configured to generate a filtered signal by filtering the mixing result signal, a measuring circuit configured to measure the period of the filtered signal and an output configured to output a value differing from the frequency of the single bit binary signal by the inverse of the measured period as the frequency to be determined.
-
公开(公告)号：US11906558B2
公开(公告)日：2024-02-20
申请号：US17970658
申请日：2022-10-21
发明人： Young Su Kwak , Kyoung Hwan Ju
IPC分类号： G01R23/173 , G01R23/167
CPC分类号： G01R23/173 , G01R23/167
摘要： A spectrum analyzer having a memory function to adopt a digital-data-based frequency sweep scheme while achieving performance comparable to performance of a high-speed FFT spectrum analyzer, and a method of controlling the spectrum analyzer, in which the spectrum analyzer includes: an ADC for converting a BWP signal, which is at least one analog unit frequency band signal, into a digital data sample at a predetermined sample rate according to a span set by a user; a digital sweep part for sweeping the data sample passed through the ADC while digitally decimating the data sample through a decimation processing block having a two-stage cascaded structure, and processing the swept data sample to increase a frequency sweep speed; and a control unit for controlling the digital sweep part according to various items input, set, and selected by the user to perform spectrum analysis and output a spectrum analysis result.
-
公开(公告)号：US11460494B2
公开(公告)日：2022-10-04
申请号：US17107767
申请日：2020-11-30
申请人： Resonant, Inc.
发明人： Richard N. Silver
IPC分类号： G01R23/167 , G06F30/36 , H03H9/46 , H03H9/54 , H03H9/64 , G06F119/18
摘要： A method of designing a filter to meet a set of specifications. The set of specifications is received, and a filter design is established. Analysis of the filter design is performed by: determining a part admittance matrix; determining a circuit admittance matrix based on the part admittance matrices; reducing interior nodes of the circuit admittance matrix; reducing algebraic nodes to transform the circuit admittance matrix into a Green's Function; evaluating the Green's Function to determine a circuit exterior node admittance matrix; and transforming the circuit exterior node admittance matrix to a circuit scattering matrix. The circuit scattering matrix is compared to the set of specifications to determine whether the filter design is satisfactory. When a determination is made that the design is not satisfactory, the filter design is modified and the process is repeated. When a determination is made that the design is satisfactory, a filter design description is output.
-
公开(公告)号：US11159023B2
公开(公告)日：2021-10-26
申请号：US16201956
申请日：2019-02-26
申请人： Wenjuan Du
发明人： Wenjuan Du , Qiang Fu , Haifeng Wang
摘要： A measurement data based method for identifying wind turbine generators which cause sub-synchronous oscillations in a complex power system has a theoretical foundation of the open-loop modal resonance and the parallel filter design. The advantages of the present invention are as follows. 1) The present invention can identify the wind turbine generators which cause the SSOs in the complex power system using measurement data instead of parametric model. Hence, it simplifies the computation and reduces the modeling cost effectively. 2) The present invention can identify the wind turbine generators which cause the SSOs in the complex power system precisely with reduced amount of measurement data, reducing the cost of hardware and data measurement effectively. 3) The present invention can identify the wind turbine generators which cause the SSOs in the complex power system based on the open-loop modal resonance theory.
-
5.发明授权公开(公告)号：US11079418B2
公开(公告)日：2021-08-03
申请号：US15558996
申请日：2016-03-17
申请人： Zynaptiq GmbH
发明人： Stephan M. Bernsee , Denis Gökdag
IPC分类号： G01R23/167 , G06F17/14
摘要： A signal processing method generates a time-frequency domain representation of an input signal for the purpose of signal detection, signal display, and application of filtering operations, such as sample accurate spectral editing. The method may include receiving an input signal in the time domain in a processor. The input signal may include a plurality of transform frames. The input signal is transformed into the frequency domain using a frequency transform. Time-frequency matrices are generated from the frequency transform. Crossfrequency phase coupling is applied between adjacent frequency bins to introduce synchronization between adjacent frequencies and to generate smoothed time-frequency matrices with sample-accurate frequency magnitudes. The frequency information can be edited in the time-frequency domain specific to a single sample of the transform frame to alter unwanted signal features. A modified time domain representation of the edited input signal can be generated from the modified time-frequency matrices.
-
公开(公告)号：US10921355B2
公开(公告)日：2021-02-16
申请号：US15549199
申请日：2016-02-12
发明人： Mathieu Picard , Mehdi Anteur
IPC分类号： G01R23/167 , G01R23/18
摘要： A method for detecting a plurality of useful signals in a total signal. The useful signals correspond to radiofrequency signals emitted by different terminals in a multiplexing frequency band. A plurality of spectrograms calculated that have a compensated linear frequency drift and are respectively associated with different linear frequency drift values. For each analysis frequency and each spectrogram, time envelope filtering of the values is performed at the different times for analyzing the spectrogram at the analysis frequency using a filter representing a reference time envelope of the useful signals. A useful signal is detected at an analysis time and at an analysis frequency in response to a verification of a predefined detection criterion by the value from a spectrogram resulting from filtering at the analysis time and at the analysis frequency.
-
公开(公告)号：US20190285673A1
公开(公告)日：2019-09-19
申请号：US16353338
申请日：2019-03-14
申请人： MUSIC Group IP Ltd.
发明人： Esben Skovenborg
IPC分类号： G01R23/167 , H04S7/00 , H03G5/16
摘要： A method of analyzing and displaying spectral-dynamic properties of an audio signal, including measuring a level over time in multiple neighboring frequency-bands based on the audio signal; calculating spectral-dynamic characterizing values based on two or more statistics of a distribution of the measured levels within each of the frequency-bands; and displaying a graphical representation of the spectral-dynamic characterizing values as a function of frequency.
-
公开(公告)号：US10388302B2
公开(公告)日：2019-08-20
申请号：US15539979
申请日：2015-12-23
申请人： Yves Reza
发明人： Yves Reza
摘要： A method for processing an initial signal includes a useful signal and added noise, which comprises a step of frequency selective analysis providing starting from initial signal a plurality of wideband analysis signals corresponding to one of the analyzed frequencies, and comprising the following actions: zero or more complex frequency translations, one or more undersampling operations, computation of the instantaneous Amplitude, of the instantaneous Phase, and of the instantaneous Frequency of the wideband analysis signals. This information then allow to detect modulations of signals included in high levels of noise and to detect with a good probability the presence of a signal in a high level of noise.
-
公开(公告)号：US20190187195A1
公开(公告)日：2019-06-20
申请号：US16172892
申请日：2018-10-29
申请人： SHIMADZU CORPORATION
发明人： Tohru MATSUURA
IPC分类号： G01R23/167 , G01R23/175 , G01R23/177
CPC分类号： G01R23/167 , G01N3/30 , G01N3/32 , G01N2203/0218 , G01R23/175 , G01R23/177
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.
-
公开(公告)号：US20180172743A1
公开(公告)日：2018-06-21
申请号：US15578901
申请日：2016-05-20
发明人： Martin Hempl
IPC分类号： G01R23/167
CPC分类号： G01R23/167 , G01H1/003 , G01L19/00 , G01M15/14 , G01R23/16 , G06F17/142 , H03M1/124
摘要： A method and apparatus for analysing a signal, in which a spectrum of the signal is provided, which spectrum is the result of a multiplication of the signal by a predefined window function and a subsequent Fourier transform, the highest spectral line and the adjacent second-highest spectral line are determined in the spectrum in the region of at least one local maximum, the amplitude of the highest spectral line and of the second-highest spectral line is determined, at least one value dependent on the amplitude of the highest spectral line and on the amplitude of the second-highest spectral line is determined, a frequency correction value is determined for the frequency of the highest spectral line from the determined value using a frequency correction characteristic curve which was created for the predefined window function, and the frequency of the highest spectral line is corrected by the frequency correction value.
-
-
-
-
-
-
-
-
-
搜索结果
139 条记录 (耗时 0.025 秒)
