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http://www.aisys.com.sg/news-details/what-is-current-ongoing-12hr-leq-for-noiselynx-users#:~:text=Under%20Singapore%27s%20Environmental%20Protection%20and%20Management%20%28Control%20of,end%20time%20of%207pm%20for%20the%20DAY%20period.
http://www.aisys.com.sg/news-details/what-is-current-ongoing-12hr-leq-for-noiselynx-users
At 7pm, twelve (12) hours after 7am, if the "ongoing Leq" drops to 75 dBA, Leq12P(%) will still be 100%. If the 12hrs Leq at 7pm is less than 75 dBA, then Leq12P(%) will be lower than 100%. Our system referenced the following table provided by NEA, and has also gone through stringent verification by NEA.
https://www.nea.gov.sg/our-services/pollution-control/noise-pollution/construction-noise-control
Mondays to Saturdays. Types of affected buildings. 7am - 7pm. 7pm - 10pm. 10pm - 7am. (a) Hospital, schools, institutions of higher. learning, homes for aged sick, etc. 60 dBA. (Leq* 12 hrs)
https://www.nas.gov.sg/archivesonline/data/pdfdoc/MEWR20010929001.pdf
Leq 12 hours [Reckoned as an equivalent continuous noise level over a period of 12 hours in decibels (A)] 65 65 Leq 5 mins [Reckoned as an equivalent continuous noise level over 5 minutes in decibels (A)] 70 70 New Noise Limits Leq 1 hour [Reckoned as an equivalent continuous noise level over a period of 1 hour in decibels (A)] 65 55
https://www.cirrusresearch.co.uk/blog/2015/06/noise-101-what-is-equivalent-continuous-sound-level-leq/
What is Leq (Equivalent Continuous Sound Level)? Put simply, the L eq is the average sound pressure level during a period of time. L eq is often described as the average noise level during a noise measurement, which although not technically correct, is often the easiest way to think of L eq. If the noise is varying quickly, the average energy ...
https://acoustic-glossary.co.uk/leq.htm
Leq is normally based on an exchange rate of 3 dB. An 8-hour Leq is also known as L EP,d = L EX,8h. Leq is the 'common' name for the equivalent continuous sound level, see the IEC definition below. Equivalent Continuous Sound Level (Leq) is the average sound level. which over a given period of time has the same total energy as the fluctuating ...
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