Comparison calibration of a pressure-velocity (p-v) tympanometric probe prototype

Wide band p-v tympanometry can be defined as the direct measurement of the acoustic immittance of the ear, in the full audio frequency range and possibly in normal air pressure condition, through the acquisition of both pressure and velocity (p-v) signals at the ear canal entrance. To this aim, a prototype of a p-v tympanometric probe has been developed by modifying a standard one, in order to host a Knowles Electronics EK- 23133-C36 microphone and a CMOS-compatible acoustic velocimeter. Such a prototype has been then calibrated by comparison with a similar p-v tympanometric probe used as a reference one, this latter hosting anyway a Microflown match-size intensity probe. Calibration methodology and obtained results are here reported.