Patent ID: 9088857
Filing Date: 2015-07-21
Classification: H04S

Abstract:
1. An audio apparatus comprising: a sound generation unit configured to generate, as a sound generation signal, a measuring signal including a plurality of repeated signal periods; a sound collection unit configured to obtain a sound collection signal by collecting the sound generation signal having been emitted as sound waves in an acoustic space; a detection unit configured to detect a level difference between the sound collection signal and background noise; a characteristic calculation unit configured to extract a respective period signal from each signal period of the measuring signal from the sound collection signal and to calculate a characteristic of an acoustic space based on an average of the extracted period signals and the measuring signal; a feature amount calculation unit configured to calculate a feature amount representative of sudden noise for each period based on each of the period signals; and a determination unit configured to compare feature amounts of the periods and to remove, from periods to be used for averaging the period signals, a period or periods whose feature amounts are not within a range between a threshold value and a minimum value of the feature amounts as a reference, wherein the threshold value in the determination unit is determined according to the level difference detected by the detection unit.