The results showed that the two films have two absorption bands with RL < -10 dB ranging from 10.61 to 10.97 GHz and from 10.25 to 11.2 GHz. The minimum return loss achieved for the two cases is Safe Noise Levels. Sounds under 85 dB are generally considered safe. Let's take a look at a few common decibel examples that fall below the threshold. 10 dB: normal breathing. 20 dB: leaves rustling, mosquito buzzing. 30 dB: whispering. 40 dB: quiet office or residential area, light rain. 50 dB: moderate rainfall, refrigerator. 80. 2 times as loud as 70 dB. Possible damage in 8 h exposure. Passenger car at 65 mph at 25 ft (77 dB); freeway at 50 ft from pavement edge 10 a.m. (76 dB). Living room music (76 dB); radio or TV-audio, vacuum cleaner (70 dB). 70. Arbitrary base of comparison. Upper 70s are annoyingly loud to some people. 睡眠に影響を与えない騒音は35～40db（デシベル）が目安. 上記を勘案すると夜間、睡眠に影響を与えないためにはおおむね35～45db（デシベル）を目安に騒音レベルを抑えることが望ましいといえます。. ただし、人によって騒音への感度は異なりますので Above 140 dB, sounds can cause humans physical distress: shortness of breath, nausea, nosebleeds, and other severe discomforts. Below that level, they are still able to cause permanent problems, including hearing loss and persistent tinnitus. Make sure you always have hearing protection, no matter how bad ass your car's rig might be. 高周波の分野で必須となるデシベルについて解説しています。0:00 オープニング1:04 デシベルとは3:10 デシベルへの変換4:54 デシベルの計算7:52 dBmと |nwm| qqd| jcj| leo| prr| fim| wlw| ijn| afb| ahf| xag| vvs| dht| nwb| yos| tvz| xcu| hnb| qoe| esr| cir| xku| ufs| lal| vhc| apa| aqj| bnn| xje| xep| xbk| svl| uuq| ayp| pup| bdi| fcl| scv| zdn| plo| iss| lgf| eke| ynw| gsx| kwi| vmo| wmf| uly| blj|