2024年2月13日 · For most people, 40 dB is too loud, as 30 dB is the prescribed noise level for sleep. However, some people are light sleepers and may even be bothered by noise levels as …

2024年8月22日 · This decibel level chart shows noise effects within the range of 40 – 140 dB. This range of sound ranges from simple, hush noises such as raindrops at 40 dB to loud, …

Garbage disposal, dishwasher, average factory, freight train (at 15 meters). Car wash at 20 ft (89 dB); propeller plane flyover at 1000 ft (88 dB); diesel truck 40 mph at 50 ft (84 dB); diesel train …

2022年9月26日 · A计权 (A-Weighted) 是一种用于音频测量的标准权重曲线，用于反映人耳的响应特性。声压电平源于A计权，用dbA表示，或称为A计权dB电平。A计权是广泛采用的噪声的单 …

2024年2月15日 · Instead, just remember that decibels are relative and logarithmic. Relative means that dB is only a useful measurement when compared to other dB values. Logarithmic …

2012年6月16日 · 40dBA isn't loud by any means. You'll be able to hear it throughout a very quiet room. If you have anything you're listening to, it will get drowned out pretty easily. Some …

Moderate noises are between 40 and 60 decibels. These levels are acceptable no matter how long you are exposed to them, and they are not considered potentially harmful to your hearing. …

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 exposure. You should never …

分贝是国家选定的非国际单位制单位, 是我国法定计量单位中的级差单位，表示为DB ， 其定义为:“两个同类功率量或可与功率类比的量之比值的常用对数乘以10 等于1时的级差” 。 同时， 在 …

2007年8月22日 · 3英尺距离的低声耳语相当于30 dBA， 50英尺距离的繁忙高速公路大约是80 dBA， 而操作距离内的链锯声音可以达到110 dBA，甚至更高。 其实：dB 就是 dA，没区别 举 …