| 摘要 |
PURPOSE:To remove noises from a beam output without causing large characteristic deterioration even if a target sound source changes its direction with time by making the stepping width of the adaptive beam former (ABF) in a beam main-axis direction smaller than that of a nonadaptive wait beam former (CBF). CONSTITUTION:The CBF20 has the 1st time delay compensators 211-21K which rotate the beam main shaft in plural directions with specific stepping width, and generates plural beams. A target direction estimating device 30 estimates the direction of the target sound source from the output of the CBF20. Further, the ABF40 has the 2nd time delay compensators 801-80K which rotate the beam main axis in plural directions with specific smaller stepping width about the direction closest to said estimated value, and generates a beam in the direction closest to the estimated value. Then, detailed information of the target sound source is obtained from the output signal of the ABF40. |
