Patent ID: 6327366
Filing Date: 2001-12-04
Classification: H04R

Abstract:
A method for fitting or construing a hearing device to fit an individual, comprising the steps of:providing a model which provides for a psycho-acoustic perception value in dependency of acoustical signals of any spectrum, said model having multiple parameters including at least a portion of the critical frequency bands;quantifying said psycho-acoustic perception value as perceived by a standard;quantifying said psycho-acoustic perception value as perceived by said individual;fitting or construing said hearing device as a function of differences of said parameters of said model as modelling said quantified perception of. said standard and as modelling said quantified perception of said individual, so that perception of said individual equipped with said fitted hearing device and perception of said standard become related at least approximately in a predetermined manner, wherein said psycho-acoustic perception value comprises loudness value and comprising the step of modelling said loudness value by: ##EQU2##wherein:k: index with 1.ltoreq.k.ltoreq.k.sub.o, numbering of the number k.sub.o of critical bands which are considered;CB.sub.k : spectral width of the considered critical band with the number k;.alpha..sub.k : slope of a linear approximation of loudness perception, which are scaled in categories, at logarithmic representation of the level of a presented sinusoidal or narrow-band acoustic signal having a frequency which approximately lies in the center of the considered critical band CB.sub.k ;T.sub.k : hearing threshold for the mentioned sine wave signal;S.sub.k : the average sound pressure level of a presented acoustic signal at the considered critical frequency band CB.sub.k;and wherein, if need be, the model is further extended for sound level-dependent .alpha..sub.k.