3.21 normalized 8-hour average sound level. Level of time-mean-square, A-weighted sound pressure during a normalization period Tn of eight hours, such that the sound exposure therefrom is equal to the sound exposure of a time-varying sound at a place where total sound exposure occurs within a time period not necessarily eight hours. Unit, decibel (dB); abbreviation, N8hL; symbol, LA8hn.
« Back to Standards Terminolgy IndexRecent Posts
- Standards Spotlight Pt. 2: Enhancing Acoustics in Student Gymnasiums and Fitness Spaces
- Standards Spotlight Pt 1: Why ASA/ANSI S12.60-2019/Part 4 (R2024) is Essential for Physical Education Spaces
- Newly Reaffirmed ASA Standards
- Level3IR Joins ASA Standards: Advancing Infrared Consulting Excellence
- ASA Standards Publishes Newly Revised Standard: S12.61-2024
Recent Comments