电子元件，特别使用声表面波工作的元件-OFW元件，以及制造该元件的方法。
Electronic component, esp. one operating with acoustic surface waves (OFW component) and process for its prodn.
介绍了一种采用动反馈式扬声器的管道有源自适应噪声控制系统，系统中动反馈扬声器既作为有源消声系统的执行元件，也作为检测控制效果的声传感器。
An active adaptive noise control system in ducts is proposed, which adopts a motional feedback loudspeaker not only as an noise controlling actuator but also as a detecting sensor.
搭建了一套双声源驱动热声热机实验系统，该系统包括双扬声器、谐振管、置于谐振管内的回热器和换热器等元件。
A thermoacoustic system with double acoustic drivers was constructed, which was composed of double speakers, a resonator, regenerator distributed in resonator and heat exchanger.
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