Acoustics+Vocabulary



**“Acoustics” ** = study of sound and how sound is experienced. **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 <span style="color: #c02121; font-family: Verdana,Geneva,sans-serif;"><span style="color: #ef5f0b; font-family: Verdana,Geneva,sans-serif;">**Rapid Speech Transmission Index (RASTI):** objective way of measuring speech intelligibility. <span style="color: #c02121; font-family: Verdana,Geneva,sans-serif;"><span style="color: #ef5f0b; font-family: Verdana,Geneva,sans-serif;">**Reverberation(retumbo) time, (T or RT):** The time it takes for the sound pressure level to fall after the sound has been turned off. <span style="color: #c02121; font-family: Verdana,Geneva,sans-serif;">**<span style="color: #ef5f0b; font-family: Verdana,Geneva,sans-serif;">Signal to noise ratio (S/N) (Relación señal- ruido)= ** background noise level. <span style="color: #c02121; font-family: Verdana,Geneva,sans-serif;"><span style="color: #ef5f0b; font-family: Verdana,Geneva,sans-serif;">**Sound strength (dB):** Measured in __**dB (deciBel)**__. dB is measured at different frequencies.