Patent ID: 8795192

Claim:
A method for characterizing an incident pressure wave in a hearing test, the method comprising: introducing a first sonic stimulus into an ear canal with a first sound source transducer positioned in an ear canal; measuring at least a frequency domain sound pressure signal (P m (f)) 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(f)) 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 + (f)) in said ear canal according to: P + ( f )= P m ( f )/(1 +R ( f )); determining, based on the incident wave pressure parameter (P + (f)), with a processor, a voltage to apply to the first sound source transducer, to keep an incident wave pressure (P + (f)) substantially constant with respect to frequency, wherein the voltage is a function of frequency and defined as to remove a standing wave field from measured sound pressure; wherein the first sonic stimulus is delivered to the ear canal by first source transducer situated near the opening of the ear canal.