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    • 32. 发明申请
    • System for prefiltering a plethysmographic signal
    • 用于预过滤体积描记信号的系统
    • US20060293575A1
    • 2006-12-28
    • US11250201
    • 2005-10-14
    • Mark Norris
    • Mark Norris
    • A61B5/00
    • A61B5/14551A61B5/7207
    • A detector signal in a pulse oximeter is prefiltered, prior to processing so as to determine a physiological parameter value, so as to reduce the effects of artifact in the signal. An exemplary prefilter multiplies signal amplitude values by a quantitude that is inversely proportional to a substantially current amplitude so as to reduce the amplitude of large amplitude sections typically associated with artifact. In one implementation, the quantity is a ratio of an amplitude associated with a clean section of the signal by some exponential factor of a substantially current amplitude. In this manner, artifact affected portions of the signal are deemphasized in subsequent analyses.
    • 脉冲血氧计中的检测器信号在处理之前被预先过滤,以便确定生理参数值,以便减少信号中伪像的影响。 示例性的预滤波器将信号幅度乘以与基本上电流的幅度成反比的量子,以便减小通常与伪影相关联的大振幅段的振幅。 在一个实现中,数量是与信号的干净部分相关联的幅度与基本上电流幅度的指数因子的比率。 以这种方式,在随后的分析中,对该信号的工件影响部分被削弱。