External casing and acoustic signatures of a raindrop impacting its surface, 2: Time series of a representative impact with visible high frequency vibration.
<p>3: STFT logarithmic spectrogram, showing 100 ms on both sides of the impact. 4: Frequency filter banks, averaged over 5 steps (5 ms) centered on (black) and off (red) the impact. Note a 12–18 kHz mode on the impact. 5: Different contrasts averaged over high frequency (black) and low frequen...
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2024
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