What Is Sound?
, P is sound pressure) • One can say e.g. a channel is amplifying the sound by 3 dB, meaning the output is 3 dB louder than the input. • In order to make it interpretable as a real unit, a fixed pressure P 0 = 2*10-5 Pa is defined (the reference of 0db corresponds to the threshold of hearing) and the absolute sound pressure P in Decibel is ...
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