| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electronic keyboard instrument incorporating speakers, which allows the reduction of unnecessary resonance occurring in a speaker rear space in an enclosure. <P>SOLUTION: In an enclosure 3 which supports a keyboard with a performance portion of the keyboard exposed and includes, in an inner space, a musical sound generation circuit for generating a musical sound signal corresponding to keyboard operation and speakers 30a and 30b for emitting sounds in accordance with the musical sound signal generated by the musical sound generation circuit, a first sound emission path though which sounds are propagated from sound emission surfaces of the speakers 30a and 30b toward a player and a second sound emission path through which sounds are propagated from back the sound emission surfaces of the speakers 30a and 30b toward the player via the inner space are formed. Resonators 32a and 32b resonating at a specific resonance frequency generated in the inner space due to driving of the speakers 30a and 30b are provided so that a control point is located at a sound pressure loop in a vibration normal mode of the resonance frequency in the inner space, and sound pressure in the sound pressure loop is reduced by resonance of the resonators. <P>COPYRIGHT: (C)2013,JPO&INPIT |
