說明 譯自英文 - 在大氣探測和噪音污染中，環境噪音水平是給定位置的背景聲壓水平，通常指定為研究新侵入聲源的參考水平。通常測量環境聲級，以繪製空間範圍內的聲音狀況，以了解其隨場所的變化。在這種情況下，調查的結果是聲級等值線圖。備選地，可以測量環境噪聲水平以提供用於分析對給定環境的侵入聲音的參考點。 维基百科（英文) 查看原文說明 查看原文說明 說明 In atmospheric sounding and noise pollution, ambient noise level is the background sound pressure level at a given location, ... Wikipedia
In atmospheric sounding and noise pollution, ambient noise level is the background sound pressure level at a given location, normally specified as a ...
The following decibel levels of common noise sources are typical, but will vary. Noise levels above 140dBA can cause damage to hearing after just one ...
A sound's loudness is measured in decibels (dB). Normal conversation is about 60 dB, a lawn mower is about 90 dB, and a loud rock concert is about 120 dB. In ...
Common Sources of Noise and Decibel Levels ... Sound is measured in decibels (dB). A whisper is about 30 dB, normal conversation is about 60 dB, and a motorcycle ...
Noise level is measured in decibels (dB). ... Noise level is thus described in decibels A (dBA). The effects of noise vary with the noise to which a person is exposed. Prolonged exposure to loud noises (75 dBA over eight hours a day for years) can lead to hearing loss.
