O'Toole John M, Temko Andriy, Stevenson Nathan
Annu Int Conf IEEE Eng Med Biol Soc. 2014;2014:3288-91. doi: 10.1109/EMBC.2014.6944325.
Signal processing measures of instantaneous energy typically include only amplitude information. But measures that include both amplitude and frequency do better at assessing the energy required by the system to generate the signal, making them more sensitive measures to include in electroencephalogram (EEG) analysis. The Teager-Kaiser operator is a frequency-weighted measure that is frequently used in EEG analysis, although the operator is poorly defined in terms of common signal processing concepts. We propose an alternative frequency-weighted energy measure that uses the envelope of the derivative of the signal. This simple envelope- derivative operator has the advantage of being nonnegative, which when applied to a detection application in newborn EEG improves performance over the Teager-Kaiser operator: without post-processing filters, area-under the receiver-operating characteristic curve (AUC) is 0.57 for the Teager-Kaiser operator and 0.80 for the envelope-derivative operator. The envelope-derivative operator also satisfies important properties, similar to the Teager-Kaiser operator, such as tracking instantaneous amplitude and frequency.
瞬时能量的信号处理测量通常仅包括幅度信息。但同时包含幅度和频率的测量在评估系统生成信号所需的能量方面表现更好，这使得它们成为脑电图（EEG）分析中更敏感的测量指标。蒂杰 - 凯泽算子是一种频率加权测量方法，常用于EEG分析，尽管该算子在常见信号处理概念方面定义不明确。我们提出了一种替代的频率加权能量测量方法，它使用信号导数的包络。这种简单的包络 - 导数算子具有非负的优点，当应用于新生儿EEG的检测应用时，其性能优于蒂杰 - 凯泽算子：在没有后处理滤波器的情况下，蒂杰 - 凯泽算子的接收器操作特征曲线下面积（AUC）为0.57，而包络 - 导数算子的AUC为0.80。包络 - 导数算子还满足与蒂杰 - 凯泽算子类似的重要特性，如跟踪瞬时幅度和频率。
