Acoustical measurements

Defining the absorbtion coefficient of a material
Defining the absorbtion coefficient of a material

Sound can be defined as fluctuation of particles within a medium. The longitudinal wave motion is produced by a vibrating body such as the speaker cone or foot steps on the floor. When vibration is transferred from air to the structure, it is called structure-borne noise. Sound insulation is the procedure to prevent sound from being transferred from one room to another. In the National Building Code of Finland (NBCF), published by the Ministry of the Environment, are many regulations for sound insulation and noise control in apartment buildings and terrace houses. The regulations mainly concern the insulation of airborne noise from speech and household machines and structure-borne noise from foot steps or falling objects. Even though NBCF?s regulations apply only to apartments, sound insulation and noise reduction should never be forgot in, for example, schools, hospitals, hotels and office buildings.

Sound insulation measurements have been standardized in International Standard Organization?s ISO 140 and ISO 717. It takes approximately an hour to measure airborne or impact sound insulation. After being founded in 1996 the company has made hundreds of sound technical measurements.