| 摘要 |
Provided is a digital speaker (1) equipped with one piezoelectric element (4) having n-number of electrodes (51, 52, 53) that are spaced apart. Sound pressure is adjusted according to the area of the electrodes (51, 52, 53), and all of the electrodes (51, 52, 53) can be driven by the same voltage. Further provided is a speaker system in which the digital speaker (1) is applied to a tweeter (11), or to all speakers that include a woofer (13). By means of this speaker system, provided are earphones (8) which are compact and have high sound-quality. |
