pistonphone活塞話筒學術名詞活塞校音器:物理化學儀器設備、物理學、計量學活塞式發聲器:機械工程、造船工程活塞發聲器:電機工程、資訊英文釋義an acoustical calibrator (sound source) that uses a closed coupling volume to generate a precise sound pressure for the calibration of measurement microphones.