| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technology to estimate reflection sound information from a sound collection signal. <P>SOLUTION: Template information which is a collection of templates (TP) to show the transfer characteristic for every frequency between a pth (1≤p≤P) position and each position of M microphones is prepared beforehand. An observation signal and the template information are used to determine a pth complex amplitude so that the power of a residual signal obtained by subtracting from the observation signal a pth reflection sound which is a pth TP multiplied by the pth complex amplitude becomes the minimum value. The power of a residual signal obtained by subtracting from the observation signal the pth reflection sound which is the determined pth complex amplitude multiplied by the pth TP is sought regarding each p. The TP that gives the minimum power of them is determined, and near a direction D defined by the position corresponding to the determined TP, the direction D is corrected so that the power of a residual signal E obtained by subtracting from the observation signal a transfer characteristic function multiplied by the complex amplitude becomes the minimum value in order that the arrival direction of the reflection sound is estimated. <P>COPYRIGHT: (C)2012,JPO&INPIT |
