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    • 9. 发明申请
    • METHOD FOR DISPLAYING SPECTRAL TRENDS IN COMPLEX SIGNALS
    • 在复杂信号中显示光谱趋势的方法
    • WO2005036455A2
    • 2005-04-21
    • PCT/US2004/033317
    • 2004-10-08
    • CASE WESTERN RESERVE UNIVERSITYJOHNSON, Mark, W.
    • JOHNSON, Mark, W.
    • G06N
    • A61B5/048A61B5/7257
    • A method for displaying changes in spectral content of data signals over periods of time using a computer system (300). The method includes the steps of transforming time segments of digitized data signals into a frequency based spectral representation of the digitized data. The resulting spectral data are then grouped into appropriate frequency bins. Each frequency bin is normalized by the frequency range of the bin. The energy or power in each frequency bin is then multiplied by f n , where f represents an estimate of the frequency of the bin, and n is an exponent which is used to normalize the frequency content of the data. A logarithmic value is then calculated for each frequency bin. The logarithmic value of each frequency bin for each time period is then mapped to a color or gray-scale value. Finally, the mapped color or gray-scale value is displayed on a computer monitor (306) in the computer system as an image, where the signal frequency is represented along one axis, time is represented along a second axis, and the value of the energy or power at that given time and frequency is displayed as the color or gray-scale value assigned to that point.
    • 一种使用计算机系统(300)在一段时间内显示数据信号的频谱内容的变化的方法。 该方法包括将数字化数据信号的时间段转换为数字化数据的基于频率的频谱表示的步骤。 然后将所得到的光谱数据分组成适当的频率仓。 每个频率仓通过仓的频率范围进行归一化。 然后将每个频率仓中的能量或功率乘以f ,其中f表示箱的频率的估计,n是用于对数据的频率内容进行归一化的指数。 然后对每个频率仓计算一个对数值。 然后将每个时间段的每个频率仓的对数值映射到一个颜色或灰度值。 最后,将映射的颜色或灰度值作为图像显示在计算机系统中的计算机监视器(306)上,其中信号频率沿着一个轴表示,时间沿第二轴表示,并且 在给定时间和频率下的能量或能量被显示为分配给该点的颜色或灰度值。