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 low as 30 dB. If you find that 30 dB is too loud for you, consider using a white noise machine to …

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, explosive sounds such as gunshots or fireworks at 140 dB.

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 at 45 mph at 100 ft (83 dB). Food blender (88 dB); milling machine (85 dB); garbage disposal (80 dB). 80: 2 times as loud as 70 dB.

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值评价指标，可以通过声级计测量得到。

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 means that, for every 10 dB, the corresponding real-world volume doubles. For instance, 40 dB is twice as loud as 30 dB, and half as loud as 50 dB. Image Credit: JRJfin, Shutterstock

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 people couldn't...

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. Examples of moderate sounds include: · normal level of speech; · rainfall; · refrigerator; · light traffic; · a residential street. Soft

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 expose yourself more than this displayed time to protect yourself from hearing loss.

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， 在中华人民共和国法定单位的补充说明中对“可与功率类比的量” 加以了说明：“ 通常是指电流平方、电压平方、质点速度平方、 声压 平方、位移平方、速度平方、加速平方、力平方、 振幅 平方、 场强 和声能密度等” 。 参考资料： 百度百科-分贝. 4 0 －6 0 分贝的一般为普通室内谈话。 1、0 …

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 举个例子，电流的单位是安培，我们也可以说是安； 电压的单位是伏特，我们也可以说伏。 所以 …