| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide the technique of adjusting acoustic property by controlling the natural oscillation of a resonant frequency generated in a housing when loudspeakers emit sound. <P>SOLUTION: A housing having a first sound emitting path by which sound from the sound emitting surfaces of the loudspeakers 60a and 60b attached to a baffle plate is guided to outside and a second sound emitting path by which sound from behind the sound emitting surfaces of the loudspeakers 60a and 60b is guided to outside via space behind the loudspeakers 60a and 60b comprises: a first resonator that resonates at a specific frequency when the loudspeakers 60a and 60b emit sound and has a control point located on the anti-node of the sound pressure of the natural oscillation of the frequency; and a second resonator that resonates at frequency different from the first resonator, located near the baffle plate, at the position of the anti-node of sound pressure of the natural oscillation of a sound wave that causes a reaction force restraining the oscillations of the loudspeakers 60a and 60b at the frequency, or, at the position of the node of the natural oscillation so that the sound pressure of the natural oscillation of the frequency has the anti-node at the position communicating with the outside of the second sound emitting path. <P>COPYRIGHT: (C)2012,JPO&INPIT |
