Figure 3

The SBP and DBP Prediction Networks. For predicting SBP, real SBP data was used as the target value. For predicting DBP, real DBP data was used. The network consists of Conv1D layers that process the ECG signal, Conv1D layers that process the PPG signal, a concatenation layer that mixes the features of PPG and ECG, an LSTM layer, and lastly, a fully connected layer to predict either SBP or DBP.