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    • 5. 发明授权
    • Sinewave frequency measuring apparatus
    • 正弦波频率测量仪
    • US5262714A
    • 1993-11-16
    • US33447
    • 1993-03-18
    • Vladimir Friedman
    • Vladimir Friedman
    • G01R23/02
    • G01R23/02
    • This invention relates to sinewave frequency measuring apparatus and method and more particularly such apparatus including a frequency estimator triggered by a zero crossing of a sinewave and means for producing sample signals at a constant rate; and a method which provides and uses an approximation of the sinewave through the zero crossing, as a straight line between two sampling periods. Errors are eliminated by means of a low pass filter. The method performs a fractional cycle correction by adding or substracting the interpolation results from the raw period time counts.
    • 本发明涉及正弦波频率测量装置和方法,更具体地说,涉及包括由正弦波的过零点触发的频率估计器和以恒定速率产生采样信号的装置的装置。 以及通过过零点提供和使用正弦波的近似作为两个采样周期之间的直线的方法。 通过低通滤波器消除错误。 该方法通过从原始时间计数中添加或减去插值结果来执行分数循环校正。
    • 9. 发明授权
    • System and method for suppression of RFI interference
    • 用于抑制RFI干扰的系统和方法
    • US07072617B1
    • 2006-07-04
    • US10850307
    • 2004-05-19
    • Bindu GuptaFaramarz SabouriVladimir Friedman
    • Bindu GuptaFaramarz SabouriVladimir Friedman
    • H04B1/10
    • H04L25/085H03G3/3052H04L27/0002
    • A system and method for suppressing RFI receives a differential input signal Vd, and a signal Vcm which varies with the common mode component of Vd. Vcm is phase-shifted and then amplified with a programmable gain G1 to produce an output VA1. A subtractor produces an output Vsub which varies with Vd−VA1. Vsub is amplified with a programmable gain G2 to produce an output VA2. An analog input signal processing circuit receives VA2 at an input which has an associated maximum dynamic range. A processor adjusts G2 such that VA2 covers the maximum dynamic range, adjusts the phase shift and G1 to minimize VA2, and adjusts G2 to increase VA2 such that it again covers the maximum dynamic range. The RFI in Vd is substantially subtracted out, thereby enabling the full dynamic range of the analog input signal processing circuit to be employed in receiving Vd.
    • 用于抑制RFI的系统和方法接收差分输入信号V SUB,以及随着V D的共模分量而变化的信号V cc >。 VCI是相移的,然后用可编程增益G 1进行放大,以产生输出V A1。 减法器产生随着V SUB-A1 A1变化的输出V SUB子。 使用可编程增益G 2对V SUB子件进行放大,以产生输出V A2。 模拟输入信号处理电路在具有相关最大动态范围的输入端接收V A2。 处理器调整G 2使得V A2覆盖最大动态范围,调整相移和G 1使V A2最小化,并调整G 2以增加V A2 ,使其再次覆盖最大动态范围。 基本上减去了V SUB中的RFI,从而使模拟输入信号处理电路的全动态范围能够用于接收V SUB。