Abstract
This report describes the active control systems for reducing floor impact noise. The control sysmtem is comprised of actively controlled modular thin plates, which wholly cover the surface of concrete slab structure in the ceiling, and in each of which the mechanical vibration is controlled independently with electro-magnetic actuators. In this report main componets of the control system, a light weight honeycomb panel, the actuators and the micro-computers, are presented. The final target is to commercialize the proposed active control system, but presently the development is going on.
