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聲音的聲壓級如超逾某聲壓級值的累積時間達到百分n，則這個聲壓級值就是聲音的「累積百分n聲級」(n-Percent Exceeded Level)，符號為 L n。 我們可以利用統計學的方法來分析特定噪音的「累積百分n聲級」。
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在規劃赤 鱲 角新機場的過程中，機場管理局連同有關的政府 ...
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When noise or sound is measured in dB(A), it is customary to denote the equivalent continuous sound pressure level as L Aeq. Let us explain L eq or L Aeq by using an illustration. Please click on the demo button to see the details.
There are two sets of noise criteria or Basic Noise Levels, in dB(A), abbreviated as BNLs: BNLs contained in the Technical Memorandum on Noise from Construction Work in Designated Areas
Noise measurement. In acoustics, noise measurement can be for the purpose of measuring environmental noise [1] or measuring noise in the workplace. Applications include monitoring of construction sites, aircraft noise, road traffic noise, entertainment venues and neighborhood noise.
The most common measurement in environmental noise is the dB (A) level. It can be measured with a simple Sound Level Meter having an A-weighting filter to simulate the subjective response of the human ear. The dB (A) level is used to report ambient noise and noise intrusions, it is also used in computing L Aeq,T and L An,T.
ISO 1996-1:2016 defines the basic quantities to be used for the description of noise in community environments and describes basic assessment procedures. It also specifies methods to assess environmental noise and gives guidance on predicting the potential annoyance response of a community to long-term exposure from various types of ...
2020年2月25日 · Sound Level Meters. A sound level meter is commonly a hand-held instrument with a microphone and is used for acoustic measurements or noise assessments. The diaphragm of the microphone responds to changes in air pressure caused by sound waves and converts the sound pressure deviation into an electrical signal.
