PROCÉDÉ DE DÉTERMINATION D'UN ÉTAT D'UN TRAJET DE RÉTROACTION ACOUSTIQUE D'UN DISPOSITIF AUDITIF PORTABLE SUR LA TÊTE ET DISPOSITIF AUDITIF PORTABLE SUR LA TÊTE

摘要

The invention relates to a method of determining a status of an acoustic feedback path (FB) of a head wearable hearing device (100),the head wearable hearing device (100) comprising a first housing (10) being located in the ear canal (420) of a user, a microphone (110, 110', 110"), and a first control system (200) configured for controlling the active vent (20) of the first housing (10) between an open state and a closed state;the first housing (10) comprising a loudspeaker (15),the method comprising:- emitting an acoustic signal (RS) from said loudspeaker (15)- measuring (503, 603) a first transfer function (AV_Open) between the loudspeaker/receiver (15) and the microphone (110) in response to the emitted signal (RS), when the active vent (20) is expected to be in an open state;- measuring (505, 605) a second transfer function (AV_Close) between the loudspeaker/receiver (15) and the microphone (110) in response to the emitted signal (RS), when the active vent (20) is expected to be in a closed state;determining the state of the active vent (20) based at least on a comparison the first and second measured transfer functions (AV_Open, AV_Close).