Patent ID: 9496839
Filing Date: 2016-11-15
CPC Classification: G10D,G10H,H03G

Claim Text:
1. An audio processing apparatus that extracts a particular sound by a particular percussion in real time from an input audio signal comprising: a sound period decision section that decides a sound period by the particular percussion; an attack decision section that decides an attack position of the particular sound in the audio signal; and a particular sound extraction section that extracts the particular sound using a time varying filter, the time varying filter including an adaptive type filter in which an extraction rate of the particular sound varies with volume change of the input audio signal during the sound period, and a time varying type filter in which characteristics of extraction of the particular sound from the attack position vary over time from the attack position but not with the volume change of the input audio signal, wherein the particular sound extraction section applies the adaptive type filter during the sound period and applies the time varying type filter at the attack position.