公开(公告)号：US06697766B2

公开(公告)日：2004-02-24

申请号：US09832508

申请日：2001-04-10

申请人： Shie Qian ,  Nanxiong Zhang

发明人： Shie Qian ,  Nanxiong Zhang

IPC分类号： G06F1900

CPC分类号： G01R29/02

摘要： System and method for characterizing a Gaussian pulse in a signal. The system includes a computer operable to receive the signal, determine a set of estimated parameters for the Gaussian pulse using a “zoom-in” approach, permute the estimated parameter set to generate one or more permuted parameter sets, where the estimated and permuted parameter sets each represent a corresponding waveform, generate closed form inner products between the received signal and each waveform, generate linear equations from the inner products, each linear equation being a function of a respective one of the parameter sets and corresponding parameter variables for the Gaussian pulse, and determine values for the parameter variables by solving the linear equations. The determined parameters characterize the Gaussian pulse. If there are N parameters to determine and M permutations generated, where M is greater than or equal to N, M+1 linear equations are solved to overdetermine the N parameters.

摘要翻译： 用于表征信号中的高斯脉冲的系统和方法。 该系统包括可操作以接收信号的计算机，使用“放大”方法确定用于高斯脉冲的一组估计参数，将估计的参数集合置换以生成一个或多个置换的参数集，其中估计和置换的参数 集合各自表示相应的波形，在接收信号和每个波形之间产生闭合形式的内积，从内积产生线性方程，每个线性方程是高斯脉冲的参数集和相应参数变量中的相应参数集的函数 ，并通过求解线性方程来确定参数变量的值。 确定的参数表征高斯脉冲。 如果存在N个参数以确定并产生M个排列，其中M大于或等于N，求解M + 1个线性方程，以过度确定N个参数。

公开(公告)号：US06453273B1

公开(公告)日：2002-09-17

申请号：US09974402

申请日：2001-10-09

申请人： Shie Qian ,  Hui Shao ,  Wei Jin

发明人： Shie Qian ,  Hui Shao ,  Wei Jin

IPC分类号： G01P2102

CPC分类号： G01H1/003

摘要： A signal analysis system and method for analyzing an input signal acquired from a mechanical system. The mechanical system may include at least one rotating apparatus. The signal analysis system may include an input for receiving samples of an input signal acquired from the mechanical system, wherein the input signal is sampled in time, and wherein the input signal comprises a plurality of order components. The signal analysis system may also include a processor coupled to the input and a memory medium coupled to the processor which stores analysis software. The processor may be operable to execute the analysis software to: (a) perform an invertible joint time-frequency transform on the input signal to produce a first array of coefficients which depend on time and frequency; (b) generate a modified array of coefficients from the first array of coefficients, wherein the modified array of coefficients corresponds to a desired subset of the plurality of order components; and (c) generate a time domain signal from the modified array of coefficients. The signal analysis system may also include a presentation device coupled to the processor which is operable to present the time domain signal to a user. The time domain signal is useable in analyzing operation of the rotating apparatus in the mechanical system.

摘要翻译： 一种用于分析从机械系统获取的输入信号的信号分析系统和方法。 机械系统可以包括至少一个旋转装置。 信号分析系统可以包括用于接收从机械系统获取的输入信号的样本的输入，其中输入信号在时间上被采样，并且其中输入信号包括多个次序分量。 信号分析系统还可以包括耦合到输入的处理器和耦合到存储分析软件的处理器的存储介质。 处理器可以可操作以执行分析软件以：（a）对输入信号执行可逆联合时间 - 频率变换以产生依赖于时间和频率的第一系数阵列; （b）从所述第一系数阵列生成经修改的系数阵列，其中所述经修改的系数阵列对应于所述多个次序分量的期望子集; 和（c）从修改的系数阵列产生时域信号。 信号分析系统还可以包括耦合到处理器的呈现设备，其可操作以向用户呈现时域信号。 时域信号可用于分析机械系统中旋转装置的操作。

公开(公告)号：US06434515B1

公开(公告)日：2002-08-13

申请号：US09370310

申请日：1999-08-09

申请人： Shie Qian

发明人： Shie Qian

IPC分类号： G06F1717

CPC分类号： G06F17/141

摘要： A signal analyzer, method and memory medium for generating a time varying spectrum for input signals characterized by frequency components which change in time. The signal analyzer includes a source of a sequence of digital signals representative of an input signal, a processor coupled to the source, and a memory medium coupled to the processor. The memory medium stores a software program which is executable by the processor to compute the time-varying spectrum of the input signal. When the processor executes the software program, the processor is operable to first compute a Gabor transform (that is, a sampled short-time Fourier transform) of the digital signals to produce Gabor coefficients. The processor then computes a two dimensional auto-correlation of the Gabor coefficients to produce auto-correlation results. The auto-correlation results are then applied to a 2-dimensional fast interpolation filter to produce the time-varying spectrum, wherein the time-varying spectrum is a Gabor spectrogram. The signal analyzer may repeat the above steps n+1 times, based on the order determined by a user, and sum the results for an n order time-varying spectrum. The process more may then operate to process and/or display the time-varying spectrum.

摘要翻译： 一种信号分析器，方法和存储介质，用于为以时间变化的频率分量为特征的输入信号产生时变频谱。 信号分析器包括表示输入信号的数字信号序列的源，耦合到源的处理器和耦合到处理器的存储介质。 存储介质存储可由处理器执行的软件程序，以计算输入信号的时变频谱。 当处理器执行软件程序时，处理器可操作以首先计算数字信号的Gabor变换（即采样的短时傅里叶变换）以产生Gabor系数。 然后，处理器计算Gabor系数的二维自相关以产生自相关结果。 然后将自相关结果应用于二维快速内插滤波器以产生时变谱，其中时变谱是Gabor谱图。 信号分析器可以基于用户确定的顺序重复上述步骤n + 1次，并且对n阶时变谱进行求和。 然后该过程可以操作以处理和/或显示时变谱。

公开(公告)号：US06366862B1

公开(公告)日：2002-04-02

申请号：US09636097

申请日：2000-08-10

申请人： Shie Qian ,  Hui Shao ,  Wei Jin

发明人： Shie Qian ,  Hui Shao ,  Wei Jin

IPC分类号： G01F156

CPC分类号： G01H1/003

摘要： A signal analysis system and method for analyzing an input signal acquired from a mechanical system. The mechanical system may include at least one rotating apparatus. The signal analysis system may be configured to: (a) receive samples of the input signal, (b) perform an invertible joint time-frequency transform (e.g. a Gabor transform) on the samples of the input signal to produce a first array of coefficients which depend on time and frequency, (c) compute an instantaneous rotation frequency signal, (d) select first coefficients from the first array which correspond to one or more order components in the input signal, i.e. one or more multiples of the instantaneous rotation frequency signal, (e) generate a time domain signal from the first coefficients, and (f) present the time domain signal to a user on a presentation device. The signal analysis system may generate the time domain signal from the first coefficients by performing an inverse joint time-frequency transform on the first coefficients.

摘要翻译： 一种用于分析从机械系统获取的输入信号的信号分析系统和方法。 机械系统可以包括至少一个旋转装置。 信号分析系统可以被配置为：（a）接收输入信号的采样，（b）对输入信号的样本执行可逆联合时间频率变换（例如，Gabor变换）以产生第一系数阵列 这取决于时间和频率，（c）计算瞬时旋转频率信号，（d）从第一阵列中选择与输入信号中的一个或多个次要分量对应的第一系数，即瞬时旋转频率的一个或多个倍数 信号，（e）从第一系数产生时域信号，以及（f）在呈现装置上向用户呈现时域信号。 信号分析系统可以通过对第一系数执行逆联合时间 - 频率变换来从第一系数产生时域信号。

公开(公告)号：US06332116B1

公开(公告)日：2001-12-18

申请号：US09551924

申请日：2000-04-19

申请人： Shie Qian ,  Hui Shao

发明人： Shie Qian ,  Hui Shao

IPC分类号： G01F156

CPC分类号： G01H1/003

摘要： A signal analysis system and method for analyzing an input signal acquired from a mechanical system. The mechanical system may include at least one rotating apparatus. The signal analysis system may be configured to: (a) receive samples of the input signal, (b) perform an invertible joint time-frequency transform (e.g. a Gabor transform) on the samples of the input signal to produce a first array of coefficients which depend on time and frequency, (c) select first coefficients from the first array which correspond to a first subset of one or more order components in the input signal, (d) generate a time domain signal from the first coefficients, and (e) present the time domain signal to a user on a presentation device. The signal analysis system generate the time domain signal from the first coefficients by performing an inverse joint time-frequency transform on the first coefficients. The signal analysis system extract the one or more order components for presentation to the user by masking out all coefficients except those corresponding to the one or more components. Conversely, the signal analysis system may suppress the one or more order components, i.e. present to the user the input signal minus the one or more order components by masking out coefficients corresponding to the one or more components and keeping the remaining coefficients.

摘要翻译： 一种用于分析从机械系统获取的输入信号的信号分析系统和方法。 机械系统可以包括至少一个旋转装置。 信号分析系统可以被配置为：（a）接收输入信号的采样，（b）对输入信号的样本执行可逆联合时间频率变换（例如，Gabor变换）以产生第一系数阵列 （c）从第一阵列中选择与输入信号中的一个或多个次分量的第一子集对应的第一系数，（d）从第一系数产生时域信号，（e ）在呈现设备上向用户呈现时域信号。 信号分析系统通过对第一系数执行逆联合时间 - 频率变换来生成来自第一系数的时域信号。 信号分析系统通过掩蔽除了与一个或多个组件相对应的那些之外的所有系数，提取一个或多个顺序分量以呈现给用户。 相反，信号分析系统可以通过屏蔽对应于一个或多个分量的系数并保持剩余系数来抑制一个或多个次要分量，即向用户呈现输入信号减去一个或多个次分量。

公开(公告)号：US5910905A

公开(公告)日：1999-06-08

申请号：US744435

申请日：1996-11-08

申请人： Shie Qian ,  Mark E. Dunham

发明人： Shie Qian ,  Mark E. Dunham

IPC分类号： G06F17/10

CPC分类号： G06F17/10

摘要： A system and method for detecting the presence of dispersed broadband signals in real time. The present invention utilizes a bank of matched filters for detecting the received dispersed broadband signals. Each matched filter uses a respective robust time template that has been designed to approximate the dispersed broadband signals of interest, and each time template varies across a spectrum of possible dispersed broadband signal time templates. The received dispersed broadband signal x(t) is received by each of the matched filters, and if one or more matches occurs, then the received data is determined to have signal data of interest. This signal data can then be analyzed and/or transmitted to Earth for analysis, as desired. The system and method of the present invention will prove extremely useful in many fields, including satellite communications, plasma physics, and interstellar research. The varying time templates used in the bank of matched filters are determined as follows. The robust time domain template is assumed to take the form w(t)=A(t)cos{2.phi.(t)}. Since the instantaneous frequency f(t) is known to be equal to the derivative of the phase .phi.(t), the trajectory of a joint time-frequency representation of x(t) is used as an approximation of .phi.'(t).

摘要翻译： 一种用于实时检测分散宽带信号的存在的系统和方法。 本发明利用一组匹配滤波器来检测接收到的分散宽带信号。 每个匹配滤波器使用相应的鲁棒时间模板，其被设计为近似分散的感兴趣的宽带信号，并且每个时间模板在可能的分散的宽带信号时间模板的频谱上变化。 接收到的分散宽带信号x（t）由每个匹配滤波器接收，并且如果发生一个或多个匹配，则确定所接收的数据具有感兴趣的信号数据。 然后可以根据需要将该信号数据分析和/或发送到地面进行分析。 本发明的系统和方法将在包括卫星通信，等离子体物理学和星际研究在内的许多领域中非常有用。 在匹配滤波器组中使用的变化时间模板如下确定。 假定鲁棒时域模板采用w（t）= A（t）cos {2 phi（t）}的形式。 由于已知瞬时频率f（t）等于相位phi（t）的导数，所以将x（t）的联合时间 - 频率表示的轨迹用作phi（t）的近似值。

公开(公告)号：US09232309B2

公开(公告)日：2016-01-05

申请号：US13547289

申请日：2012-07-12

申请人： Zhonghou Zheng ,  Shie Qian

发明人： Zhonghou Zheng ,  Shie Qian

IPC分类号： G06F17/00 ,  H04R3/00 ,  H04R1/40

CPC分类号： H04R3/005 ,  H04R1/406 ,  H04S2400/15

摘要： An audio system is provided that employs time-frequency analysis and/or synthesis techniques for processing audio obtained from a microphone array. These time-frequency analysis/synthesis techniques can be more robust, provide better spatial resolution, and have less computational complexity than existing adaptive filter implementations. The time-frequency techniques can be implemented for dual microphone arrays or for microphone arrays having more than two microphones. Many different time-frequency techniques may be used in the audio system. As one example, the Gabor transform may be used to analyze time and frequency components of audio signals obtained from the microphone array.

摘要翻译： 提供了一种音频系统，其采用时频分析和/或合成技术来处理从麦克风阵列获得的音频。 这些时频分析/合成技术可以更加鲁棒，提供更好的空间分辨率，并且具有比现有的自适应滤波器实现更少的计算复杂度。 可以对双麦克风阵列或具有两个以上麦克风的麦克风阵列实施时频技术。 在音频系统中可以使用许多不同的时频技术。 作为一个示例，可以使用Gabor变换来分析从麦克风阵列获得的音频信号的时间和频率分量。

公开(公告)号：US20120179059A1

公开(公告)日：2012-07-12

申请号：US13428047

申请日：2012-03-23

申请人： Zhijun Gu ,  Nanxiong Zhang ,  Shie Qian

发明人： Zhijun Gu ,  Nanxiong Zhang ,  Shie Qian

IPC分类号： A61B5/0402 ,  A61B5/0432 ,  A61B5/0472 ,  A61B5/044

CPC分类号： A61B5/0472

摘要： A system, method, and memory medium for operating on an electrocardiogram (ECG) signal. A multiscale short-time Fourier transform (STFT) is perform on a set of ECG samples {s(n)} to obtain a transform array. For each sufficiently energetic peak in the transform array, a refined window width value and a refined window displacement value is generated by: computing an inner product between the set of samples and each of a plurality of functions, where the plurality of functions are sufficiently close to a coarse approximation function given by the peak location; and solving a linear system Av=c for the unknown vector v, where the vector c is determined by the inner products, where the matrix A is determined by the center times of the plurality of functions. After appropriate selection, the refined window width and refined window displacement may be used to represent ECG waveform features.

摘要翻译： 用于在心电图（ECG）信号上操作的系统，方法和存储介质。 在一组ECG样本{s（n）}上执行多尺度短时傅立叶变换（STFT）以获得变换数组。 对于变换阵列中的每个足够高能量的峰值，通过以下方式生成精细的窗口宽度值和精细的窗口位移值：计算样本集合和多个函数中的每一个的内积，其中多个函数足够接近 到由峰值位置给出的粗略近似函数; 并求解用于未知向量v的线性系统Av = c，其中向量c由内积决定，其中矩阵A由多个函数的中心时间确定。 经过适当的选择，精细的窗口宽度和精细的窗口位移可用于表示ECG波形特征。

公开(公告)号：US5852567A

公开(公告)日：1998-12-22

申请号：US695321

申请日：1996-07-31

申请人： Xiang-Gen Xia ,  Shie Qian

发明人： Xiang-Gen Xia ,  Shie Qian

IPC分类号： H04B1/10 ,  H04L27/00 ,  G06F15/31 ,  G01R23/16

CPC分类号： H04B1/10 ,  H04L27/0004

摘要： An iterative time frequency algorithm filters noisy wide band/nonstationary signals by projecting the noisy signal into the TF domain, masking the TF response, computing the inverse TF transform to extract a filtered signal, and repeating these steps until the projection lies within the mask. As a result, the TF domain properties of the extracted signal are substantially equal to the desired TF domain properties. Furthermore, the iterative approach is computationally simple because it avoids inverting matrices. The TF transform and its inverse must be selected such that the iterative algorithm is guaranteed to converge. Candidate transform pairs can be tested on known data, and if the TF transforms converge to the desired TF properties, the candidate pair can be selected. Alternately, the candidate pairs can be tested against a sufficient convergence condition, and if they satisfy the condition within an acceptable tolerance, they can be selected with confidence. Furthermore, the sufficient convergence condition can be solved directly to provide the TF transform and its inverse.

摘要翻译： 迭代时间频率算法通过将有噪声信号投射到TF域中来掩蔽TF响应，计算逆TF变换以提取滤波信号，并重复这些步骤，直到投影位于掩模内，来对噪声宽带/非平稳信号进行滤波。 结果，提取的信号的TF结构域性质基本上等于期望的TF结构域性质。 此外，迭代方法在计算上是简单的，因为它避免了反相矩阵。 必须选择TF变换及其逆，使迭代算法保证收敛。 可以对已知数据测试候选变换对，如果TF变换收敛到期望的TF属性，则可以选择候选对。 或者，可以针对足够的收敛条件来测试候选对，并且如果它们满足可接受的容限内的条件，则可以置信地选择候选对。 此外，可以直接解决足够的收敛条件，以提供TF变换及其逆。

公开(公告)号：US20130016854A1

公开(公告)日：2013-01-17

申请号：US13547289

申请日：2012-07-12

申请人： Zhonghou Zheng ,  Shie Qian

发明人： Zhonghou Zheng ,  Shie Qian

IPC分类号： H04B15/00

CPC分类号： H04R3/005 ,  H04R1/406 ,  H04S2400/15

摘要： An audio system is provided that employs time-frequency analysis and/or synthesis techniques for processing audio obtained from a microphone array. These time-frequency analysis/synthesis techniques can be more robust, provide better spatial resolution, and have less computational complexity than existing adaptive filter implementations. The time-frequency techniques can be implemented for dual microphone arrays or for microphone arrays having more than two microphones. Many different time-frequency techniques may be used in the audio system. As one example, the Gabor transform may be used to analyze time and frequency components of audio signals obtained from the microphone array.

摘要翻译： 提供了一种音频系统，其采用时频分析和/或合成技术来处理从麦克风阵列获得的音频。 这些时频分析/合成技术可以更加鲁棒，提供更好的空间分辨率，并且具有比现有的自适应滤波器实现更少的计算复杂度。 可以对双麦克风阵列或具有两个以上麦克风的麦克风阵列实施时频技术。 在音频系统中可以使用许多不同的时频技术。 作为一个示例，可以使用Gabor变换来分析从麦克风阵列获得的音频信号的时间和频率分量。