![]() ![]() Hope this helps shed further insight into the usage of decibels. (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. The logarithmic expression The most common bases for logarithms are 10, Logarithms have the following properties and identities: A decibel (dB) is defined as. The reference point that relates the logarithmic dB scale to the linear. The bel is defined to be the base ten logarithm of a power ratio. 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. The decibel (dB) is 10 times the decimal logarithm of the ratio between two. The characteristics of audio signals and noise are often specified in decibels. 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). The scale for measuring intensity is the decibel scale. decibels), provides a mathematical method for aligning measurements with certain human perceptions, e.g. This type of scale is sometimes referred to as a logarithmic scale. In other words, a logarithmic scale (i.e. ![]()
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