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    Method for equivalent high sampling rate FIR filtering based on FPGA
    1.
    发明授权
    Method for equivalent high sampling rate FIR filtering based on FPGA 有权

    公开(公告)号：US10998885B2

    公开(公告)日：2021-05-04

    申请号：US16163596

    申请日：2018-10-18

    Applicant: University of Electronic Science and Technology of China

    Inventor： Lianping Guo ,  Hao Zeng ,  Feng Tan ,  Duyu Qiu ,  Xianggong Guo ,  Yu Li

    IPC: H03H17/06 ,  H03H17/02 ,  H03H17/00

    Abstract: The present invention provides a method for equivalent high sampling rate FIR filtering based on FPGA, first, the coefficients h(k) of FIR filter are found by using MATLAB, multiplied by an integer and then rounded for the purpose that the rounded coefficients h(k) can be directly used into a FPGA, then the ADC's output of high data rate fs is lowered by dividing the ADC's output x(n) into M parallel data streams xi(n) of low data rate, and the M×L samples in one clock cycle is obtained by delaying the M parallel data streams xi(n) simultaneously by 1, 2, . . . , L′ periods of the synchronous clock, at last, the samples yi(n) of FIR filtering output is calculated according to the samples selected from the M×L samples, and the filtered data y(n) of data rate fs is obtained by putting the samples yi(n) together in ascending order of i. Thus, the continuous FIR filtering of an ADC's output sampled with high sampling rate is realized, while the data rates before and after the FIR filtering are unchanged.

    Method for oscilloscope 3D mapping in scan mode
    2.
    发明授权
    Method for oscilloscope 3D mapping in scan mode 有权

    公开(公告)号：US10677817B2

    公开(公告)日：2020-06-09

    申请号：US15879146

    申请日：2018-01-24

    Applicant: UNIVERSITY OF ELECTRONIC SCIENCE AND TECHNOLOGY OF CHINA

    Inventor： Kuojun Yang ,  Wuhuang Huang ,  Peng Ye ,  Qinchuan Zhang ,  Hao Zeng ,  Duyu Qiu ,  Jun Jiang ,  Huiqing Pan ,  Lianping Guo ,  Feng Tan

    IPC: G01R13/02

    Abstract: A method for oscilloscope 3D mapping in scan mode. The input signal is acquired using a real-time sampling rate which is Dr times higher, thus more sampling points, i.e. Dr acquired data can be obtained during the time interval between two consecutive horizontal pixels. The Dr acquired data are mapped into a same column of the screen to implement fluorescent waveform display. In addition, to realize the scanning display, a flag X is introduced into the three-dimensional database, when the screen refresh signal arrives, the first Ds acquired data are read out from the unread acquired data in FIFO memory. The three-dimensional database is updated from the flag X, which make the leftmost waveform always be the oldest waveform, the rightmost waveform always be the newest waveform. Thus the 3D mapping is realized in scan mode, letting the DSO have a fluorescent waveform display at slow time-base.

    Method and apparatus for automatically adjusting the hold-off time of a DSO
    4.
    发明授权
    Method and apparatus for automatically adjusting the hold-off time of a DSO 有权

    公开(公告)号：US10823762B2

    公开(公告)日：2020-11-03

    申请号：US16005763

    申请日：2018-06-12

    Applicant: UNIVERSITY OF ELECTRONIC SCIENCE AND TECHNOLOGY OF CHINA

    Inventor： Qinchuan Zhang ,  Feng Tan ,  Huiqing Pan ,  Hao Zeng ,  Luonan Zheng

    IPC: G01R13/02

    Abstract: The present invention provides a method and apparatus for automatically adjusting the hold-off time of a DSO based on real-time cycle measurements of the system trigger signal: obtaining a cycle sequence by measuring the system trigger signal, the maximum cycle and minimum cycle, then judging the difference of the maximum cycle and minimum cycle: if the difference is greater than a threshold set by user, setting the hold-off time to the maximum cycle, the minimum cycle or the median cycle, then returning; otherwise terminating the adjustment of the hold-off time. At this point, the hold-off time is correctly set. Therefore, the present invention reduces the complexity and time consumption of the hold-off adjustment, and allows the test signal to be quickly and stably displayed on screen of DSO, meanwhile, which makes the trigger adjustment of DSO more convenient.

    Method and system for oscilloscope triggering
    6.
    发明授权
    Method and system for oscilloscope triggering 有权

    公开(公告)号：US10775418B2

    公开(公告)日：2020-09-15

    申请号：US15859987

    申请日：2018-01-02

    Applicant: UNIVERSITY OF ELECTRONIC SCIENCE AND TECHNOLOGY OF CHINA

    Inventor： Jun Jiang ,  Lianping Guo ,  Xiaoman Jiao ,  Wuhuang Huang ,  Hao Zeng ,  Feng Tan

    IPC: G01R13/02

    Abstract: The present invention provides a method and system for oscilloscope triggering. The power spectrum entropy threshold Gp and the singular spectrum entropy threshold Gs are obtained by calculating the averages of the power spectrum entropy Hi and the singular spectrum entropy Ei of the first a waveform data frames respectively. Then, for the waveform data frame xa+1(τ) and thereafter, If the power spectrum entropy Hi is greater than power spectrum entropy threshold Gp and the singular spectrum entropy Ei is greater than the singular spectrum entropy threshold Gs, the waveform data frame xi(τ) is an abnormal signal, the second trigger occurs, storing and displaying the waveform data frame. Thus the storage and display of abnormal signal is realized.

    Method for measuring the waveform capture rate of parallel digital storage oscilloscope
    7.
    发明授权
    Method for measuring the waveform capture rate of parallel digital storage oscilloscope 有权
    并行数字存储示波器波形捕获率测量方法

    公开(公告)号：US09523717B2

    公开(公告)日：2016-12-20

    申请号：US14057544

    申请日：2013-10-18

    Applicant: University of Electronic Science and Technology of China

    Inventor： Hao Zeng ,  Peng Ye ,  Kuojun Yang ,  Guang Yang ,  Qinchuan Zhang

    IPC: G01R29/00 ,  G01R13/02

    CPC classification number: G01R13/0272 ,  G01R13/0254

    Abstract: The present invention provides a method for measuring the waveform capture rate of parallel digital storage oscilloscope. On the basis of double pulse measurement, and in consideration of the asymmetry of acquisition and the refreshing time of parallel DSO, the present invention provides a step amplitude-frequency combined pulse measurement to measure the time for waveform acquisition and mapping Tmap, the number of captured waveforms before LCD refreshing Wacq and the dead time caused by LCD refreshing TDDT, and then calculates the measured average WCR of parallel DSO, according to the measured data, so that the WCR of parallel can be measured.

    Abstract translation: 本发明提供了一种用于测量并行数字存储示波器的波形捕获率的方法。 在双脉冲测量的基础上，考虑到并行DSO的采集不对称性和刷新时间，本发明提供了一种步进幅度 - 频率组合脉冲测量，以测量波形采集和映射时间Tmap，数量 在LCD刷新Wacq之前捕获的波形和由LCD刷新TDDT引起的死区时间，然后根据测量数据计算并行DSO的测量平均WCR，从而可以测量并行的WCR。

    Method for full-digital random sampling
    8.
    发明授权
    Method for full-digital random sampling 有权
    全数字随机抽样方法

    公开(公告)号：US09130583B2

    公开(公告)日：2015-09-08

    申请号：US14584599

    申请日：2014-12-29

    Applicant: UNIVERSITY OF ELECTRONIC SCIENCE AND TECHNOLOGY OF CHINA

    Inventor： Wuhuang Huang ,  Kuojun Yang ,  Houjun Wang ,  Jun Jiang ,  Hao Zeng ,  Duyu Qiu ,  Peng Ye ,  Qinchuan Zhang ,  Shulin Tian

    IPC: H03M1/00 ,  H03M1/12 ,  G06T17/20 ,  G06F3/038 ,  G06F3/044

    CPC classification number: H03M1/128 ,  G06F3/038 ,  G06F3/044 ,  G06T17/20 ,  H03M1/00 ,  H03M1/12 ,  H03M1/1285

    Abstract: For the signal under acquisition which varies monotonically before and after the trigger time, a method for full-digital random sampling employs first sampled data before the trigger time and first sampled data after the trigger time to fit a curve, and obtains an intersection point of triggering level and the fitted curve, then, calculates the time interval between sampled data after the trigger time and the intersection point in the end, reconstructs the original signal, i.e. the signal under acquisition by a time interval of each acquisition. Thus, an analog trigger circuit and a time measurement circuit of conventional random sampling system can be eliminated, that simplifies the circuit design of data acquisition system and decreases its hardware complexity. Moreover, the higher sampling rate for the signal under acquisition is attained, and more waveform details are obtained.

    Abstract translation: 对于在触发时间之前和之后单调变化的信号，全数字随机采样的方法在触发时间之前采用第一采样数据，并在触发时间之后采用第一采样数据以拟合曲线，并获得 触发电平和拟合曲线，然后计算触发时间之后的采样数据与最终交点之间的时间间隔，重建原始信号，即每次采集时间间隔内的采集信号。 因此，可以消除常规随机采样系统的模拟触发电路和时间测量电路，简化了数据采集系统的电路设计，降低了硬件复杂度。 此外，获得获取信号的较高采样率，并获得更多的波形细节。

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