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. 2012 Sep 21;12(9):12844–12869. doi: 10.3390/s120912844

Figure 13.

Figure 13.

State space and observation space in Layer 1 HMM. “P” stands for P subwave, “QRS” for QRS complex, and “T” for T subwave. Readings from 0 to 1,023 correspond to O1, readings from 1,024 to 2,047 corresponds to O2.