title: Reply to "Comment on 'Acoustical observation of bubble oscillations induced by bubble popping' ".
abstract: We reported on the sound pressure generated by aqueous foam bursts in our paper [Ding et al., Phys. Rev. E 75, 041601 (2007)]. Blanc et al., [Phys. Rev. E 91, 036401 (2015)] found that sound from one of three mechanisms of bubble burst (the prepopping) actually results from an acausal artifact of the signal processing performed by their acquisition system which lies outside of its prescribed working frequency range. We examined the same hardware used in our paper and found that the frequency range is not the cause of the artifact. The prepopping sound was a result from a built-in finite impulse response filter of analog-to-digital converters in the Brüel & Kjær data acquisition system.
authors: Unilever Research & Development, 40 Merritt Boulevard, Trumbull, Connecticut 06611, USA.
authors: Junqi
authors: J
authors: Ding