高级音箱装置最臃肿的部分当数音箱。音箱之所以都比较大，是因为要显现低频音，必须配备大型电动扬声器。而美国自动电话网公司正在研制一种音箱替代品，在保证高质量低音的前提下，可以放入衣袋中。这种微型装置由１９个超声压电辐射器组成，其中一部分能发现２０万Ｈｚ固定 Advanced speaker device most bloated part of the number of speakers. The reason why speakers are relatively large, because to show low-frequency sound, must be equipped with large-scale electric speakers. And American automatic telephone network company is developing a kind of loudspeaker substitute, under the premise of guaranteeing high quality bass, can put into the pocket. This micro-device consists of 19 ultrasonic piezoelectric radiators, some of which can be found 200000 Hz fixed