一种多音圈式全数字扬声器的设计与实现

Design of a multi-voice-coil all-digital loudspeaker

提出了一种由USB数字音频接口、数字开关电流源电路和多音圈式换能器构成的数字扬声器设计方案。USB数字音频接口将WAV文件转换为并行数字信号输出,数字开关电流源电路根据数字信号控制相应位音圈的通断,多音圈式换能器按匝数权值实现电流到声音的转换。实验结果表明,在声音效果相同的情况下,和传统扬声器相比,数字扬声器具有低功耗,强抗干扰能力等优点,充分说明了该方案的可行性及良好的应用前景。

In this paper, a design of all-digital loudspeaker, consisting of USB Audio interface, identical-current switch and multi-voice-coil transducer, was proposed. The USB section transmits data from WAV file to the parallel ports of switch circuit which functions as a controller of voice-coil＇s current. The transducer converts electronic signals into voice. The results of test show that while sharing the same voice quality of analog＇s, the digital loudspeaker consumes less energy with a better antiinterfere ability, and thus proves that this design is a feasible one expecting a good application.