Figure 2From: Multiharmonic Frequency Tracking Method Using The Sigma-Point Kalman Smoother(a) EKS Estimation Error () and (b) FBSL-SPKS Estimation Error (). The black area in the spectrograms represents great power concentrated in the corresponding frequency at a given time. If the harmonic tracking is successful, the black stripes in Figures 1(a) and 1(b) should be eliminated as shown in Figures 2(a) and 2(b). The EKS harmonic tracker does not track the harmonic components appropriately in the rectangular box in Figure 1(a), which results in the black stripes left in the box as shown in Figure 2(a).Spectrogram of residuals with the EKS frequency trackerSpectrogram of residuals with the FBSL-SPKS frequency trackerBack to article page