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「 A 加權聲音壓力位準」 (A-weighted Sound Pressure Level)，單位為 dB(A) ：是將每個不同頻率的聲音 dB 值，取 A 加權的「頻率加權函數」，再將經 A 加權後之各頻率的聲音 dB 值，累加起來的總 dB 分貝值，就是 dB(A)。
2024年8月22日 · This db level chart shows the noise effects of sounds within the dB range of 0 to 180 dB. At 180 dB, we have moved beyond loud gunshots to the piercing blast of rocket launches. Here is another noise level chart showing examples of regular sounds with decibel levels ranging from 0 to 180 decibels.
dB (A) The decibel A filter is widely used. dB (A) roughly corresponds to the inverse of the 40 dB (at 1 kHz) equal-loudness curve for the human ear. With the dB (A) filter the sound level meter is less sensitive to very high and very low frequencies. Measurements made with this scale are expressed as dB (A).
2021年12月27日 · 聲壓分貝（dB SPL, Decibel Sound Pressure Level） 聲壓分貝才是最常用來代表衡量聲音大小的單位，而我們常用的聲壓分貝是以理論值「人類可聽到的最小音量」在空氣或其它氣體中的聲壓作為基準值設為 0dB。
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」。
The range of sounds measured on the decibel scale is from 0 dB (the quietest sound) to 140 dB (the threshold of pain). Sounds above 85 dB are considered by specialized organizations like NIOSH (the US National Institute for Occupational Safety and Health) to be dangerous to human hearing.
2020年6月3日 · To use this noise pollution calculator, enter the noise level in deceibels (dB) and it will automatically calculate the maximum amount of time for safe
