Alperin N, Sadeh D
Comput Biomed Res. 1986 Jun;19(3):193-202. doi: 10.1016/0010-4809(86)90015-7.
The most widely used methods for accurate signal averaging were studied and compared in order to gain a better understanding of the qualities and performances of each method. The level-triggering, contour-limiting, and correlation methods were simulated and compared. A new correlation method which is a weighted correlation of differences proved to be most suitable for real-time signal averaging, and detection of waveforms' variations. Simulated ECG waveforms and real ECG recordings were analyzed in this study. Twenty-eight ECG recordings of unipolar leads for noninvasive detection of the His-Purkinje activity were averaged separately by each method. The success in detection and the signal to noise ratio of the detected His activity obtained by each method was compared. Simulated ECG waveforms with random noise added were analyzed by four methods and the correct alignment as a function of the noise level was measured. The performance of our method in rejection of noisy waveforms and in detection of small variations in the waveforms is demonstrated.
为了更好地了解每种方法的特性和性能，对最广泛使用的精确信号平均方法进行了研究和比较。对电平触发、轮廓限制和相关方法进行了模拟和比较。一种新的相关方法，即差值加权相关法，被证明最适合实时信号平均和波形变化检测。本研究分析了模拟心电图波形和实际心电图记录。每种方法分别对28份用于无创检测希氏 - 浦肯野系统活动的单极导联心电图记录进行平均。比较了每种方法在检测希氏活动方面的成功率以及检测到的希氏活动的信噪比。用四种方法分析了添加随机噪声的模拟心电图波形，并测量了作为噪声水平函数的正确对齐情况。展示了我们的方法在抑制噪声波形和检测波形小变化方面的性能。
