Acoustics+Vocabulary

**Articulation Class (AC):** A classification of suspended ceilings according to their ability to contribute to the acoustic privacy between work stations. It can be used as a tool to classify and compare acoustic ceiling systems. **Articulation Loss of CONSonants: ** method for measuring speech intelligibility. Consonants play a significant role, if they can be heard clearly, the speech can be understood more easily. **Background noise (dB):** examples: speech, scraping chairs, **__//humming (zumbido)//__** ventilation, traffic...Increased background noise can have negative effects, such as illness, fatigue, decreased efficiency... **Ceiling Attenuation Class (CAC): ** Single value for the laboratory sound attenuation of a suspended ceiling between two rooms. **Flutter echo (eco repetitivo):** Occurs when sound **__//bounces (rebota)//__** between parallel surfaces in a room. **Noise Reduction Coefficient (NRC):** Single value for sound absorption **Rapid Speech Transmission Index (RASTI):** objective way of measuring speech intelligibility. **Reverberation(retumbo) time, (T or RT):** The time it takes for the sound pressure level to fall after the sound has been turned off.