| 摘要 |
PROBLEM TO BE SOLVED: To improve the sound quality of music emitted from a portable terminal or the like without needing an active means such as a special amplifier and a speaker at the outside. SOLUTION: Units 104 and 105 respectively receive sound received from a speaker position 102 of the portable terminal 101 in a cavity A and emit the sound in the direction of the front by a reflecting plate 106 as it is. The cavity A is connected to a cavity B wider than the cavity A, and is further connected to a cavity C (including space behind the reflecting plate 106) much wider than the cavity B through ducts A and B. The cavities B and C are provided with passive sound emitting plates A and B having a resonance frequency of a low-pitched side of the sound received from the speaker position 102. COPYRIGHT: (C)2008,JPO&INPIT
|
