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False negative rates for I 1 and I 2 with SNR > 0.6 dB, W = 4096. Accuracy of 25 bpm was obtained only for I 1 whatever the frequency, whereas for I 2 accuracy was obtained for only 100, 150, 200, 220, and 240 bpm. (a) False negative rate for I 1. (b) False negative rate for I 2.
