To solve the problem that it takes time for measuring a loudness increase curve.
A method for measuring loudness presents a plurality of initial presentation sounds having a different frequencies with each other and sound pressure with a same loudness value, measures brain waves of a user when the initial presentation sound is presented, selects a similar typical pattern while expanding the typical pattern of brain waves including an event-related potential stored in a typical pattern storage part to compare the typical pattern with the event-related potential of the measured brain waves, presents a plurality of presentation sounds having a different frequencies with each other and different sound pressure, measures the brain waves of the user when the presentation sounds are presented, and acquires an N1 component included in the typical pattern of the brain waves expanded so as to be most similar to the event-related potential relative to the plurality of presentation sounds while expanding the selected typical pattern, and obtains the loudness increase curve referring to the relation between latency of a predetermined N1 component and loudness and using the latency of the obtained N1 component.
ADACHI NOBUO
OZAWA JUN
Daisuke Nagano
Kentaro Fujii
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