Time-distance diagrams and wavelet analysis of the filament displacement with different quasi-periodic jets. Top row: time-distance diagrams of the temperature distributions in three cases when the driving period of the jets is 1.15P_pendu, 1.45P_pendu, and 1.85P_pendu, respectively. Bottom row: corresponding wavelet periodograms of the three cases, where the dashed black lines correspond to the significance of 95%, and the horizontal red line marks the pendulum period, P_pendu.