Comparison of the first (S1) and second heart sound (S2) detection algorithms.

To evaluate the performance of the detectors, two statistical measures were used: SE = 100×(TP/(TP+FN))and +P = 100×(TP/(TP+FP)), where TP is the number of true positives (S1/S2 detected as S1/S2), FN is the number of false negatives (S1/S2 has not been detected), and FP is the number of false positives (non-S1/S2 detected as S1/S2).为评估检测器的性能，本研究采用两项统计指标：查全率（SE）与查准率（+P），计算公式分别为：SE = 100×(TP/(TP+FN)) 与 +P = 100×(TP/(TP+FP))。其中，TP代表真正例数（True Positive，即被正确检测为S1/S2的S1/S2样本），FN代表假反例数（False Negative，即未被检测到的S1/S2样本），FP代表假正例数（False Positive，即被误检测为S1/S2的非S1/S2样本）。