What is decibel?

Decibel is one unit on the decibel scale, which is a logarithmic scale. The name means a tenth of Bel , Bel is a unit of the same name named for Alexander Graham Bell and is used to compare energy in electric communication, voltage or sound intensity. The abbreviation Bel is B and decibel, db.

10 db = 1 b

The primary use of the Decibel scale is now -audibility testing and the results are called pressure levels (SP), which is similar to volume. The Association of Safety and Health at work (OSHA) has set instructions to help people determine the maximum volume that should be exposed. The level of SPL, which OSHA recommends, is 85 decibels over which special ear protection is required.

Eighty -five decibels is the threshold of the possibility of hearing loss related to noise, and this instruction should prevent such loss of hearing from preventing. This picture suggests that many people who do not currently use ears should consider it. ThenáscecejíThe graph shows that there are a lot of sound we are exposed to is over this threshold of 85 decibels. Because conditions may vary and distances are not specified, these data are approximate.

Decibels 0 low hearing threshold 10 The leaves rustle in the wind; Calm Whisper 20 20-50 Calm Conversation 40-45 Conversation between acts in theater; Hotel Lobby Conversation 50 collision 50-65 loud conversation 65-70 moderate operation; Hair dryer 65-90 train 75-80 Factory (medium) 90 heavy operation; Power Lawer 90-100 Thunder 100 boom box with a swivel volume high; Chain saw 110 shouts; Symphony Concert 115 Rock Concert 120 Ambulance Siren 130 Pain threshold 140 Aircraft takeoff 140-190 Space Rocket Takeoff 170 shotgun

Sound pressure level meters , sound levels or Sound meters are tools used to measure SP, sound intensity at the moment. Such meters use frequency weighing scales that correspond to the difference in human sensitivity to different frequencies. The most commonly used stages and decibel shortened as DBA or db (a) and a range of cEcibel shortened as DBC or db (C). The meters can also be set to slow down or quick response. He tune that OSHA specifies when it is found that the sound exceeds the level it recommends is the testing of the scale set to a slow response.

Dosimeters are like meters of sound level, but over time they monitor, store and integrate reading and can provide average reading for a specified time. Dosimeters are used to monitor personal noise, while sound level meters are used to monitor noise in the area. Because the dosimeter has been used for a longer period of time and is made to wear and have a microphone to pick up sound.