| 摘要 |
PROBLEM TO BE SOLVED: To appropriately detect a voice under noise which is larger than the voice. SOLUTION: When the input of a sound signal is received, a self correlation value which indicates a correlation degree between an input sound signal and a sound signal shifted at a predetermined period of tine is calculated for each interval in a plurality of time intervals. When each of the calculated self-correlation values is a local maximal value in the plurality of time intervals, each of sound signals which is shifted by all or any of the plurality of time intervals, in each sound signal which is shifted with a time interval when it is the local maximal value, is selected as a basic period candidate which is the candidate of a basic period of the sound signal. The continuity of each of the selected plurality of basic period candidates is analyzed, and when the analyzed continuity is a prescribed threshold or smaller, it is detected whether or not the voice signal is included. COPYRIGHT: (C)2009,JPO&INPIT
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