![]() ![]() Your ears can hear everything from a light wind rustling through distant trees, to a loud jet engine, and they need to be able to process sounds appropriately. The decibel is the unit used to measure the intensity of a sound. This post is directly related to video #08 in my Audio Recording tutorial series, which is embedded below.Īlthough watching the video is the best way to learn about this topic, because of my illustrations on the whiteboard, I've also put a copy of the audio portion of that tutorial video on SoundCloud, for people who would like to download it to listen to in vehicles, while travelling, etc. Decibel-based logarithmic measurement systems are confusing. The equation for sound intensity level (SIL) is: Here are the equations, for those who want to see the math. In most cases, the dB levels are adjusted so that they match SIL. All are relative measures, comparing a measurement to a reference level. ![]() While all of the rules look different, all decibel levels have a lot in common: Some are based on intensity others are based on pressure, amplifier power, output voltage- you name it. In the science of sound, there are lots of rules of thumb for decibels- too many to cover here. This leads a 1000-fold increase in intensity (10*10*10). Three applications of the rule add 30 dB to the sound level, but multiply the intensity by ten three times in succession.
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