Acoustics+Vocabulary

= Acoustics vocabulary =


 * Absorption Class: **

Classification of sound absorbers into Sound Absorption Classes A-E, according to EN ISO 11654, including frequencies 200-5000 Hz.


 * Acoustics: **

The study of sound. In everyday language also refers to how sound is perceived in particular premises.  Background noise (dB)  For example, speech, scraping chairs, humming ventilation, traffic, machinery and equipment, sound from corridors, adjoining rooms, playgrounds.


 * Flutter echo: **

Occurs when noise bounces between parallel surfaces in a room.


 * Noise: **

Unwanted sound. Noise can often be the individual perception of a particular sound, e.g. a background noise.


 * Privacy: **

Acoustic privacy between working places in open plan offices is expressed with the Articulation Class (AC).


 * Sound absorbers: **

Materials and structures with the ability to take up sound energy and convert it into other forms of energy. They improve room acoustics by removing sound reflections, thus reducing the noise and the reverberation time.


 * Sound absorption: **

Means that sound energy is converted into mechanical vibration energy and/or heat energy. Sound absorption is expressed as the sound absorption coefficient α or the sound absorption class (A-E) according to EN ISO 11654 or NRC/SAA according to ASTM C 423.