Decibel dB (1m) - Measurement ofsound output
The sound level can be measured but no preciseindication exists for the range of the sound. Too many unknown factors affect this value: type of sound, speed and direction of the wind, humidity, fog, rain etc. etc. The data shown in the following table are useful as theoretical indication.The strongness of a signal is always relative -see table on the right. An increase of 3 dB is heard as a doublesound level. Hearing threshold Diffusion of sound waves - Sound intensity Distance
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