![]() ![]() ![]() Or, to say the same thing yet another way, if you raise 10 to the power dB/10, you'll get the figure we're talking about divided by the figure we're comparing it to. So to put the definition of decibel another (perhaps more confusing way), the number of decibels is ten times the number that, when you raise 10 to it, equals the figure we're talking about divided by the figure we're comparing it to. What does log10 mean? By definition log10 (A) equals the number that, when 10 is raised to it, is equal to A. If it 's half as powerful, its 3.01 dB less. If it's four times as powerful, it's 6.02 dB greater. ![]() If it's twice as powerful, it's 3.01 dB greater. If it's a tenth as powerful, its 10 dB smaller. If it's 1000 times more powerful, it's level is 30 dB greater. If it's 100 times more powerful, it's level is 20 dB greater. If a sound is 10 times more powerful than another sound, it's level is 10 dB greater. We can use decibels to describe the relationship: 10 * log10 (figure we're talking about / figure we're comparing it to) = decibels.ĭecibels is a logarithmic scale. So, say we measure the power of something (like a noise, say), and we want to say how "big" it is relative to something else. To be completely, totally, nitpickingly accurate, decibels are used to measure relative levels of power (if you don't believe me, look it up in a dictionary). There's a mix of correct and slightly incorrect information above. ![]()
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