Method of measuring frequency selectivity, and method and apparatus for estimating auditory filter shape by a frequency selectivity measurement method
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United States of America Patent
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Jun 24, 2003
Grant Date -
N/A
app pub date -
Sep 27, 2000
filing date -
Sep 29, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of estimating the shape of an auditory filter by finding a coefficient p of a roex (p, r) filter used as a model of the shape of the auditory filter, comprises the steps of determining the threshold masking level N.sub.x based on a tone S which adds the given value x to the threshold of hearing T of a subject in a frequency f, generating a tone S' which deducts the given value a from the tone S, generating a masker M of a center frequency f of a notch, notch width g and level N.sub.x, transmitting to the subject an inspection sound which superposes the masker M on the tone S' by selsctively varying the notch width g, determining the notch width g at which the subject can perceive the tone S' to be the minimum notch width g.sub.x-a of the subject, calculating the coefficient p from the minimum notch width g.sub.x-a and the given value a, and estimating the shape of the auditory filter from the coefficient p and the given value x corresponding to the coefficient r.
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