Fig. 3: Measurement procedure to obtain tympanogram. | Communications Medicine

Fig. 3: Measurement procedure to obtain tympanogram.

From: Performing tympanometry using smartphones

Fig. 3

a Received acoustic signal bandpass filtered to 220--230 Hz. The acoustic signal increases in amplitude when it is inserted into the ear and changes in amplitude in response to air pressure changes. b Air pressure relative to atmospheric pressure as measured by the pressure sensor. The pressure signal spikes when the probe tip enters the ear. The pressure transducer performs a pressure sweep from 200 to −400 daPa, before returning to atmospheric pressure. c When the probe is outside the ear, only small pressure changes are recorded by the microcontroller. d Calibrated tympanogram in units of acoustic admittance magnitude.

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