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    Filter equalization using magnitude measurement data
    2.
    发明公开
    Filter equalization using magnitude measurement data 有权
    Filterabgleich手套Größenmessdaten

    公开(公告)号：EP1786163A1

    公开(公告)日：2007-05-16

    申请号：EP06255756.6

    申请日：2006-11-09

    申请人： TEKTRONIX, INC.

    发明人： He, Yi ,  Hill, Thomas C. III ,  Dasilva, Marcus K.

    IPC分类号： H04L27/00 ,  H04B1/40

    CPC分类号： H04L27/00

    摘要： A filter equalization technique for an analog signal path, such as in an instrument that simultaneously measures a signal over a band of frequencies, uses magnitude measurement data for high frequency bands for which phase-calibrated sources are not readily available. A sinusoidal signal source together with an accurate power meter is used to provide a stepped frequency input over a desired frequency band to the analog signal path with an accurate measured magnitude. The output of the analog signal path is digitized and the resulting frequency magnitudes are computed. Then the resulting power meter results are deducted from the frequency magnitudes measured each time by the instrument to determine the magnitude response of the analog signal path. Using a Hilbert transform the corresponding phase response is determined based on a minimum phase assumption over the desired frequency band. From the magnitude and phase responses an inverse or digital equalization filter may be designed for the analog signal path.

    摘要翻译： 用于模拟信号路径的滤波器均衡技术，例如在同时测量频带上的信号的仪器中，使用相位校准源不容易获得的高频带的幅度测量数据。 使用正弦信号源与精确的功率计一起，以精确的测量幅度向模拟信号路径提供期望频带上的阶跃频率输入。 数字化模拟信号路径的输出，并计算得到的频率幅度。 然后从仪器每次测量的频率幅度中扣除所得到的功率计结果，以确定模拟信号路径的幅度响应。 使用希尔伯特变换，基于期望频带上的最小相位假设来确定相应的相位响应。 从量值和相位响应可以为模拟信号路径设计反相或数字均衡滤波器。

    Modulation domain trigger
    3.
    发明公开
    Modulation domain trigger 有权
    Modulationsbereichstrigger

    公开(公告)号：EP1669764A1

    公开(公告)日：2006-06-14

    申请号：EP05257440.7

    申请日：2005-12-02

    申请人： TEKTRONIX, INC.

    发明人： Hillman, Alfred K., Jr. ,  He, Yi ,  Dasilva, Marcus K.

    IPC分类号： G01R13/02 ,  G01R23/16 ,  H04B17/00

    CPC分类号： G01R23/16 ,  G01R13/0263

    摘要： A modulation domain trigger generator demodulates a modulated input signal to extract information content, and a trigger is generated from the extracted information content in response to specified trigger criteria. The modulation domain trigger generator may be combined with a plurality of different types of trigger generators (12,14,16,18), including frequency domain (12) and time domain trigger generators (14), to process the input signal in response to different trigger criteria to produce more than one trigger. The different trigger outputs may be combined (44) to produce an acquisition trigger to acquire data surrounding an anomalous or identifiable event within the input signal.

    摘要翻译： 调制域触发发生器解调调制输入信号以提取信息内容，并且响应于指定的触发标准从所提取的信息内容产生触发。 调制域触发发生器可以与包括频域（12）和时域触发发生器（14）的多种不同类型的触发发生器（12,14,16,18）组合，以响应于 不同的触发条件产生多个触发。 可以组合（44）不同的触发输出以产生采集触发以获取围绕输入信号内的异常或可识别事件的数据。

    Improved video bandwidth resolution in dft-based spectrum analysis
    6.
    发明公开
    Improved video bandwidth resolution in dft-based spectrum analysis 有权
    视频播放器（DVI-basierter Spektrumsanalyse）

    公开(公告)号：EP2105749A1

    公开(公告)日：2009-09-30

    申请号：EP09156412.0

    申请日：2009-03-27

    申请人： Tektronix, Inc.

    发明人： He, Yi ,  Engholm, Kathryn A. ,  Dasilva, Marcus K.

    IPC分类号： G01R23/16

    CPC分类号： G01R23/16

    摘要： A method and apparatus for improved video bandwidth resolution in DFT-based spectrum analysis is disclosed. A first embodiment comprises an emulation of a continuous range of video bandwidths in DFT-based spectrum analysis using overlapping resolution bandwidth frames. A second embodiment utilizes frame weighting to reduce the standard deviation in the spectrum of noise signal to emulate a corresponding standard deviation of a specified video bandwidth.

    摘要翻译： 公开了一种在基于DFT的频谱分析中改进视频带宽分辨率的方法和装置。 第一实施例包括在使用重叠分辨率带宽帧的基于DFT的频谱分析中对视频带宽的连续范围的仿真。 第二实施例利用帧加权来降低噪声信号频谱中的标准偏差，以模拟指定视频带宽的对应标准偏差。