搜尋結果
為避免以巴斯卡(Pa)來表達聲音或噪音（以防處理難以操縱的數字），故使用分貝(dB)這個標度。 該標度以「聽覺閾」，20 μPa 或20 x 10 -6 Pa作為參考聲壓值，並定義這聲壓水平為0分貝(dB)。
Sound pressure level, which is often abbreviated as SPL or L p, in decibels (dB), can then be obtained using the following formula. You can click on the demo button to learn the formula. In the following chart, some sounds are expressed both linearly in µPa and logarithmically in dB.
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。
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
「 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 noise level chart shows the noise effects of sound within the range of 0 – 140 dB. The important thing here is that it shows the effects of noises within different ranges from typical noise levels to irritating noise to hazardous noise to highly hazardous noise.
dB（聲壓級，sound pressure level）–在空氣或其它氣體中的聲壓，參考值為20微帕斯卡（μPa） = 2×10 −5 Pa，這是人能聽到的最安靜的聲音。 大致相當於3米外蚊子飛行的聲音。
The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B). It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale. Two signals whose levels differ by one decibel have a power ratio of 10 1/10 (approximately 1.26) or root-power ratio of 10 1/20 (approximately 1.12). [1][2]
Sound levels for common sounds cover a range of about 130 dB. (See chart below for sound levels for common sounds). A quick look at the chart reveals that sound level is very a different thing than sound intensity. Every extra 10 dB corresponds to a sound that is ten times more intense than before. Stop to think 1.
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.
