It may be an environment-simulation device such as a centrifuge or electro-mechanical vibrator. 可能是一种环境模拟装置，如离心机或机电式振动台。
Previously, multimedia effects were produced by computer-controlled analog devices, like videocassette recorders, projectors, and tape recorders. 此前，多媒体效果是由计算机控制的模拟装置，如录像机，投影仪，和录音机。
