可放入衣袋的高级音箱美国自动电话网公司研制出一种音箱替代品,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,其中一部分能发出200 000赫兹固定频率超声。除超声振荡器外,其他部分接通音乐中心的低频放大器,发出从200 020—220 000赫兹各种频率的超声。20—20 000赫兹这种“附加频率”又恰好反映了再现的声音。例如,对于发出了30赫兹频率声音的低音提 Advanced speakers that can be put into the pocket US automatic telephone network company developed a speaker replacement, under the premise of ensuring high-quality bass, can be placed in the pocket. The micro-device consists of 19 ultrasonic piezoelectric radiators, some of which emit 200,000 Hz fixed-frequency ultrasound. In addition to the ultrasonic oscillator, the rest is connected to the music center’s low-frequency amplifier, which emits ultrasound at various frequencies from 200-220-220 000 Hz. 20-20 000 Hz This “additional frequency ” again just reflects the reproduced sound. For example, for a bass note that emits a frequency of 30 hertz