Takeshi Nakaichi

Method and apparatus for estimating auditory filter shape

A method for estimating the shape of an auditory filter by finding a coefficient p of a roex (p, r) filter which is used as a model for the shape of the auditory filter is provided, which comprises the steps of: generating a tone S′; generating a masker of a notch width g and level Nx′ including in a notch the frequency f in which frequency characteristics of the external and middle ears of the subject are considered; transmitting to the subject a sound which superposes the masker on the tone S′; measuring the minimum notch width gx−a of the subject while varying the notch width g; calculating the coefficient p from an upper limit value gmax of the notch width g suitable for the subject and estimating the shape of the auditory filter from the coefficient p calculated above and the value x corresponding to the coefficient r.