(57) According to the invention, a hearing instrument comprising at least one inner microphone
(6) operable to determine a sensing signal representative of an acoustic signal at
a position in front of the user's eardrum - which may be an acoustic signal at a position
between an ITE (or ITC or CIC) hearing instrument and the eardrum or between an earpiece
and the eardrum - is used. In accordance with the invention, in front of the eardrum
an acoustic signal is produced. The inner microphone creates a sensing signal representative
of the acoustic signal, and the signal processing unit of the hearing instrument determines
a characteristic of the user's ear canal based thereon and memorizes values indicative
of the characteristic. According to a preferred embodiment, the characteristic is
an acoustic coupling transfer characteristic, which is determined based on a comparison
of a signal representative of the input signal of the hearing instrument's receiver
and the sensing signal. In contrast to the state of the art, no control loop is necessary
to adapt the gain to the ear canal characteristic, but the memorized values may be
used therefor.
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