| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To detect a time period when noise is dominant, in sound source locating process, and to perform suitable processing in this time period in speech recognition process. <P>SOLUTION: Phase difference and power are calculated for each frequency component from first and second sound signals which are captured in two points, and a scatter diagram in which frequency and phase difference for each frequency component are set as coordinates is created. Arrangement of the frequency component for showing predetermined linearity on the scatter diagram is detected, together with a straight line score according to the power of the frequency component. The arrangement in which the straight line score is a predetermined threshold or more, is detected as the straight line for indicating existence of the sound source. A sound source stream composed of information of the straight lines and the straight lines scores etc. is extracted, and reliability information is attached for each time of the sound source stream, based on height of the straight line score for each time of the sound source stream. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
