Method for fitting a hearing aid device with active occlusion control to a user

A method comprising the steps of:

• inserting a part of a hearing device (3) into the ear canal (2) of a user (31), the hearing device (3) including an outside microphone (4), a receiver (7) for emitting sound into the ear canal (2), a canal microphone (8), and an occlusion control compensator filter (9) arranged in a feedback loop and configurable by a compensator filter dataset (C), and having a fitting mode and an operation mode;
• establishing a communication connection (26, 27, 28) between the hearing device (3) and a fitting device (12);
• switching the hearing device (3) into the fitting mode;
• obtaining a complex frequency-dependent plant transfer function (P) that represents the relation between an input to the receiver (7) to an output from the canal microphone (8) by sending a plant stimulus signal to the receiver (7) while a part of the hearing device (3) is in the ear canal (2) of the user (31) and analyzing a resulting sound that is sensed in the ear canal (2) by the canal microphone (8);
• producing a reference sound with the user's (31) voice while the hearing aid receiver (7) is switched off;
• obtaining an objective frequency-dependent occlusion effect function (OE, 10E1) and/or the at least one property of it, while the user's (31) voice is producing the reference sound, the receiver (7) is switched off and a part of the hearing device (3) is in the ear canal (2) of the user (31), by analyzing a canal sound in the ear canal (2) that is sensed by the canal microphone (8) in conjunction with the reference sound that is sensed by the outside microphone (4);
• using the complex frequency-dependent plant transfer function (P) and the objective frequency-dependent occlusion effect function (OE, 10E1) and/or the at least one property of it, to determine the compensator filter dataset (C);
• and
• configuring the occlusion control compensator filter (9) with the compensator filter dataset (C) with the fitting device (12).