METHOD FOR IN-SITU MEASURING AND CORRECTING OR ADJUSTING THE OUTPUT SIGNAL OF A HEARING AID WITH A MODEL PROCESSOR AND HEARING AID EMPLOYING SUCH A METHOD

摘要

The application relates to an in-situ method to measure and correct or adjustthe sound signal presented to the eardrum by means ofa hearing aid and a hearing aid employing such a method. The hearing aidcomprises at least one microphone (1), at least one digital signalprocessor (2) for transforming the microphone signal into a transformed signalaccording to a desired transformation function, a receiver(3), a sensing means (4) for sensing the sound signal appearing in front ofthe eardrum and at least one comparison means (5). A modelof the electroacoustic system of the ear and the hearing aid is establishedand stored in the hearing aid, which model simulates the soundsignal in the earcanal in front of the eardrum. This model is adapted inresponse of an error signal generated in case the difference betweenthe representation of the sensed signal and the simulated sound signal isabove a predetermined threshold.