ABSTRACT
In daily life outdoors we encounter noise and vibration generated by, for example, aircraft, road and rail traffic, and indoor noise and vibration sources such as mechanical ventilation systems, elevators and other items of equipment. It is against all such sources that countermeasures are sought. Even in residential accommodation there are many kinds of electrical appliances: dishwashers, food processors, washing machines, which are on the increase and give rise to annoyance.
