Patent ID: 8295499

Claim:
An audio information processing apparatus, comprising: a hardware processor configured to execute: dividing an audio signal in a unit time into audio signals in a predetermined number of time periods; determining, among the time periods, a time period having a power change ratio of an audio signal larger than a first threshold value as an attack candidate; searching the time period of the attack candidate and a time period immediately before the time period of the attack candidate for an attack starting point; correcting a power of an audio signal included in the time period including the attack starting point resulting from the search using a power of an audio signal included in a time period immediately after the time period including the attack starting point; and determining whether a power change ratio of the audio signal included in the time period which includes the attack starting point and in which the power of the audio signal is corrected is larger than a second threshold value for attack detection which is larger than the first threshold value.