Patent ID: 8182431

Claim:
A method for characterizing an incident pressure wave in a hearing test, the method comprising: introducing a sonic stimulus into an ear canal with a sound source transducer positioned in an ear canal; measuring at least a sound pressure level (P m ) in said ear canal with a receiving transducer in the ear canal; processing information, with a processor, associated with said sound pressure level; determining, with a processor, at least an acoustic reflectance (R) including a real and imaginary part based on information associated with said sound pressure level; determining, with a processor, an incident wave pressure parameter (P+) in said ear canal according to: P+=Pm /(1 +R ); determining based upon the incident pressure wave parameter (P+), with a processor, a voltage to apply to the sound source transducer to keep an incident wave pressure (P+) approximately constant with respect to frequency, wherein the voltage is a function of frequency in order to remove a standing wave field from the measured sound pressure.