| 摘要 |
PROBLEM TO BE SOLVED: To provide an audible-sound directivity controller requiring no large energy without using a large-sized parametric loudspeaker by controlling the directivity of an audible sound. SOLUTION: The audible-sound directivity controller has ultrasonic-vibrator arrays 20 with a plurality of ultrasonic vibrators 22 and a target-place detecting means 10 detecting reaching target places of ultrasonic wave radiated from the ultrasonic-vibrator arrays 20. The audible-sound directivity controller further has an ultrasonic-vibrator control means 50 discretely controlling a plurality of the ultrasonic vibrators 22 fitted to the ultrasonic-vibrator arrays 20. COPYRIGHT: (C)2008,JPO&INPIT
|
