![]() ![]() The decibel equation can also be written in terms of a change. Another conversation at 66 decibels has 4x the SPL. At 63 dBA, that conversation has 2x the sound pressure level of the 60dBA SPL conversation. dB is a logarithmic unit, which means it displays numerical data of. It is named after the famous Alexander Graham Bell, who is known for inventing the telephone. A slightly louder conversation might measure 63 decibels. A dB or decibel is a measuring unit that evaluates the relative power or intensity of sound, generally in contrast with a reference point. ![]() For instance, any increase by 5 dB represents an increase in intensity by a factor of 3.16. Consider a normal conversation that measures 60 on the decibel scale (60 dBA). Similarly, a 60 dB sound has ten times the intensity of a 50 dB sound, and 1/10th the intensity of a 70 dB sound.Īn increase of x dB means that the sound has increased in intensity by some factor. Any more intense than this and sounds start getting uncomfortable.Īn earthquake measuring 6.0 on the Richter scale is 10 times more powerful as one measuring 5.0, and 1/10th as powerful as one measuring 7.0. 120 dB, 12 orders of magnitude higher than our reference level, has an intensity of 1 W/m 2. Every 10 dB represents a change of one order of magnitude in intensity. This is around the lowest intensity sound we can hear, and it works out to 0 dB. Where I is the intensity in W/m 2 and I o is a reference intensity known as the threshold of hearing. This is why we use the decibel scale - much like the Richter scale for measuring earthquakes, the decibel scale is logarithmic. The ear can do this because it responds to sound intensity logarithmically. People may hear distinct sounds at varying frequencies ranging from 20 to 20,000 cycles per second. On the decibel scale, near absolute silence is designated as 0 dB while a sound 15 times louder is labeled as 15 dB 11. It can handle sound with frequencies covering three orders of magnitude, and intensities covering 12 orders of magnitude! A decibel is defined by a ratio that represents a logarithmic scale in respect to a reference pressure level. The human ear is actually an amazing instrument.
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