Absorption Class Classification of sound absorbers into Sound Absorption Classes A-E, according to EN ISO 11654, including frequencies 200-5000 Hz.
Ceiling Attenuation Class (CAC) Single value for the laboratory sound attenuation of a suspended ceiling between two rooms according to ASTM E 1414. This measurement takes only into account the sound transmission through the suspended ceiling.
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.
Plasterboard A construction material consisting of a rigid panel of several layers of fibreboard or paper bonded to a gypsum core
Reverberation The repetition of a sound resulting from reflection of the sound waves
Sound level The sound level that is constantly generated in the room will, on the other hand, be effectively dealt with by the ceiling and be less dependent on sound-dispersing (scattering) objects. A sound absorption class A product provides the most effective decrease of the sound level.
Speech clarity Suspended ceilings have a positive effect on speech clarity by reducing the reverberance in the room. A good, effective, sound-absorbing ceiling contributes to a good relation between early and late sound reflections in such a way as to benefit speech clarity.
Speech Transmission Index (STI) Similar to the RASTI method but a more complete form of measuring speech intelligibility by measuring all octave bands in the frequency range 125-8000 Hz.
Rapid Speech Transmission Index (RASTI) RASTI is an objective way of measuring speech intelligibility. It is measured at two frequencies, 500 and 2000 Hz, by placing a loudspeaker, which transmits sound from the location of the person speaking, and a microphone where the listeners are situated. (See also STI).
Sound insulation The ability of a building element or building structure to reduce the sound transmission through it. The sound insulation is measured at different frequencies, normally 100-3150 Hz. Airborne sound insulation is expressed by a single value, Dn,c,w , Rw or R'w. Impact sound insulation is expressed by a single value Ln,w or L' n,w .
Absorption Class
Classification of sound absorbers into Sound Absorption Classes A-E, according to EN ISO 11654, including frequencies 200-5000 Hz.
Ceiling Attenuation Class (CAC)
Single value for the laboratory sound attenuation of a suspended ceiling between two rooms according to ASTM E 1414. This measurement takes only into account the sound transmission through the suspended ceiling.
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.
Plasterboard
A construction material consisting of a rigid panel of several layers of fibreboard or paper bonded to a gypsum core
Reverberation
The repetition of a sound resulting from reflection of the sound waves
Sound level
The sound level that is constantly generated in the room will, on the other hand, be effectively dealt with by the ceiling and be less dependent on sound-dispersing (scattering) objects. A sound absorption class A product provides the most effective decrease of the sound level.
Speech clarity
Suspended ceilings have a positive effect on speech clarity by reducing the reverberance in the room. A good, effective, sound-absorbing ceiling contributes to a good relation between early and late sound reflections in such a way as to benefit speech clarity.
Speech Transmission Index (STI)
Similar to the RASTI method but a more complete form of measuring speech intelligibility by measuring all octave bands in the frequency range 125-8000 Hz.
Rapid Speech Transmission Index (RASTI)
RASTI is an objective way of measuring speech intelligibility. It is measured at two frequencies, 500 and 2000 Hz, by placing a loudspeaker, which transmits sound from the location of the person speaking, and a microphone where the listeners are situated. (See also STI).
Sound insulation
The ability of a building element or building structure to reduce the sound transmission through it. The sound insulation is measured at different frequencies, normally 100-3150 Hz. Airborne sound insulation is expressed by a single value, Dn,c,w , Rw or R'w. Impact sound insulation is expressed by a single value Ln,w or L' n,w .