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. Author manuscript; available in PMC: 2016 Aug 1.
Published in final edited form as: IEEE Trans Hum Mach Syst. 2015 Aug;45(4):465–477. doi: 10.1109/THMS.2015.2408615

Fig. 1.

Fig. 1

A single swallow simultaneously recorded with both a microphone and dual axis accelerometer [21]. One can see obvious differences between sound and vibratory signals as well as different vibration directions.

(a) Time domain recording. Top figure: Microphone, Middle figure: Anterior-Posterior direction of the accelerometer, Bottom figure: Superior-Inferior direction of the accelerometer. This figure has been previously published by BioMed Central in [21].

(b) Corresponding power spectral density estimates of (1a)