Patent ID: 9179230
Filing Date: 2015-11-03
Classification: A61B,H04R

Abstract:
1. A system for estimating the occlusion effect, said system comprising: a hearing aid capable of being set up for operation in an occlusion measurement mode, said hearing aid comprising a first transducer configured to transform an acoustic sound level external to a hearing aid user's ear canal into a first electrical signal, and a second transducer configured to, when in said occlusion measurement mode, transform the acoustic sound level in the occluded ear canal into a second electrical signal, said system further comprising analogue to digital converters for converting signals from said first and second transducer into digitized electrical signals, a signal processor comprising a filter bank configured to, when measuring an occlusion effect, split the first and the second digitized electrical signals into a first and a second frequency band split digitized electrical signal, respectively, a sound pressure estimator for estimating the sound pressure in each frequency band for both the first and the second frequency band split signal, and a leakage estimator for estimating the leakage of signal into a frequency band from other frequency bands due to non ideal band pass filtering, wherein the system is configured such that the estimated sound pressure must be larger than the estimated leakage when deciding if the estimated sound pressure in a given frequency band can be used in the calculation of the occlusion effect.