HEARING AID AND METHOD FOR ESTIMATING A SOUND PRESSURE LEVEL AT A WEARER'S EARDRUM

A method at hearing aid and a hearing aid including a processor, a first microphone, a second microphone; wherein the first microphone is arranged to capture ear-canal sounds, and wherein the second microphone is arranged to capture ambient sounds; comprising: an acoustical model (511) configured to generate first values (hk) for the multiple frequency channels based on first parameters (G, A, l); and a statistical model (512) configured to generate second values (rk) for the multiple frequency channels based on values of second parameters (s1, s2, ··· , sn) and a set of basis vectors (u1, u2, ··· , un). An optimizer (509) is configured to obtain an optimized set of parameter values ({G, A, l, s1, s2, ··· , sn}*) including values of the first parameters and values of the second parameters; wherein the optimized set of parameter values is obtained by minimizing a difference between the first sound pressure levels (robs) and a combination of the first values (rk) and the second values (hk). An advantage is that sound pressure levels at the eardrum of the wearer of hearing aid can be accurately determined using a hearing aid with a microphone arranged to capture ear-canal sounds only at a distance from the ear drum.