| 摘要 |
<p>A sound projection device (10) for use in speaking to one or more specific persons on a selective basis, the device including a housing having a directional aspect for aiming the housing at a target area, a gripping handle (14) coupled to the housing to enable the device to be held in a user's hand, and a parametric speaker (42) coupled to a front end of the housing for indirectly generating at least one new sonic frequency from at least two ultrasonic frequencies of different value. The housing includes a luminating source (44) having a directional orientation substantially aligned with the directional aspect of the housing. The combination of light and directional sound source enables the user to visually identify the target area before transmitting the sonic frequency to the target.</p> |
