ACOUSTICS_VOCABULARY

One method of objectively measuring speech intelligibility is Articulation Loss of CONSonants (%-Alcons), showing the number of consonants being missed as a percentage. Consonants play a much more significant role in speech intelligibility than vowels. If the consonants are heard clearly, the speech can be understood more easily. 
 * Articulation Loss of CONSonants (%-Alcons)**

**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. ===

 D n,f,w (dB)
===Single value, according to EN ISO 717-1, for the laboratory sound insulation of a suspended ceiling between two rooms, measured according to ISO 10848-2. This measurement takes only into account the sound transmission through the suspended ceiling. ===  **Sabine**The physicist Wallace Clement Sabine (1869-1919) created in Riverbank, west of Chicago, the well known Sabine formula (T=0,16V/A), showing the relationship between reverberation time (T s), room volume (V m³) and the amount of absorption (A m²). (image): (Sabine's formula)  **Sound strength (dB)**Measured in dB (deciBel). dB is measured at different frequencies. dB(A) (or L pA ) is a single-figure value used to describe the total sound strength for all frequencies in a way similar to the sensitivity of the ear. dB(C) (or L pC ) particularly focuses on low frequencies and better reflects how a sound is perceived by people with impaired hearing.