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公开(公告)号：US07765086B2
公开(公告)日：2010-07-27
申请号：US11009161
申请日：2004-12-09
IPC分类号： G06F11/30
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, including frequency domain and time domain trigger generators, to process the input signal in response to different trigger criteria to produce more than one trigger. The different trigger outputs may be combined 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多个不同类型的触发发生器组合，包括频域和时域触发发生器，以响应于不同的触发标准处理输入信号以产生多于一个的触发。 可以组合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。
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公开(公告)号：US08249386B2
公开(公告)日：2012-08-21
申请号：US12058546
申请日：2008-03-28
申请人： Yi He , Marcus K. Dasilva , Kathryn A. Engholm
发明人： Yi He , Marcus K. Dasilva , Kathryn A. Engholm
IPC分类号： G06K9/36
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。 第一实施例包括使用重叠分辨率带宽帧在基于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相应标准偏差。
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公开(公告)号：US07649930B2
公开(公告)日：2010-01-19
申请号：US11272285
申请日：2005-11-09
申请人： Yi He , Thomas C. Hill, III , Marcus K. Dasilva
发明人： Yi He , Thomas C. Hill, III , Marcus K. Dasilva
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。 将模拟信号路径的输出数字化，并计算得到的频率幅度。 然后，由仪器每次测量的频率幅度中扣除所得的功率计结果，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。 根据幅度和相位响应，可以为模拟信号路径设计反相或数字均衡滤波器。
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公开(公告)号：US4654610A
公开(公告)日：1987-03-31
申请号：US758608
申请日：1985-07-23
申请人： Marcus K. Dasilva
发明人： Marcus K. Dasilva
摘要： A multi-path, ladder-type variable step RF signal attenuator is provided. The ladder network is comprised of a number of asymmetric power splitting elements and PI-pad resistor attenuator elements. The high-speed switching and long life characteristics of PIN diodes are utilized to switch resistive attenuator elements into or out of the ladder network to provide selectable values of signal attenuation.
摘要翻译： 提供多路梯形式可变步长RF信号衰减器。 梯形网络由多个非对称功率分离元件和PI-焊盘电阻器衰减器元件组成。 使用PIN二极管的高速开关和长寿命特性来将电阻衰减器元件切换到梯形网络中或从梯形网络中切出以提供可选择的信号衰减值。
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