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dB (Decibel) is the most important and often used scale in the RF field, but it’s also understandably difficult and confusing for someone just being introduced to it. Visit ABOUT to see what you can learn from this blog.’. Hope this helps shed further insight into the usage of decibels. ‘Note: This is an article written by an RF engineer who has worked in this field for over 40 years. (The air at sea level actually starts going non-linear and “distorting” at about 165 dB SPL.)Īs noted by the prior reference to decibels by Jarno to wikipedia, this mathematical device permits measurements that are more easily understood in terms of simplified quantities of numbers. If I recall correctly, cranking the numbers points up that this is a ratio of 1 to about a trillion from the softest detectable sound to the loudest humans can tolerate. What kind of things would be a negative on the decibel scale It’s hard to say what sounds would be a negative on the decibel scale they’re too quiet to be heard by human ears. It permits a very wide and non-linear range of physical inputs to be reduced to relative terms (hence, the use of the word “ratios”).Īs an example, human hearing has a range of approximately 130 decibels from the softest sound that can be detected, 0 dB Sound Pressure Level (SPL), to the point where the intense motion of the air causes physical pain around 130 dB SPL (note the “SPL” qualifier). decibels), provides a mathematical method for aligning measurements with certain human perceptions, e.g. Negative elevation means you’re not quite at the top yet.
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When expressing power quantities, the number of decibels is ten times the logarithm to base 10 of the ratio of two power quantities.2 That is, a change in power by a factor of 10 corresponds to a 10. In other words, a logarithmic scale (i.e. There are two different scales used when expressing a ratio in decibels depending on the nature of the quantities: field, power, and root-power.