The decibel scale is based on a logarithm with base ten. The equation for SPL is: SP L (20dB)log p. Two signals whose levels differ by one decibel have a power ratio of 10 (approximately 1. It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale. If the reference level is the threshold of hearing, I 0 1pW m2 I 0 1 p W m 2. The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B). where is the intensity of the sound and is the intensity of the reference sound to which your sound is being compared. Decibels are used to quantify sound intensity in the context of music. The equation for sound intensity level (SIL) is: SI L (10dB)log I I 0 S I L ( 10 d B) log I I 0. While sound intensity (in W/m 2) is the SI unit, the sound intensity level in decibels (dB) is more relevant for how humans perceive sounds. The decibel scale measures how loud a sound is. Several comments and comprehensive bibliographical references are also provided for each drawn page to enlarge the range of subjects or exercises that can be discussed in courses and foster further readings. You may have noticed that when people talk about the loudness of a sound, they describe it in units of decibels rather than watts per meter squared. Seven drawn pages constitute a visual support to explain the origin and history of the decibel, together with examples from acoustics and other domains on the use of logarithmic scales and classical decibel calculations. This paper is an example of how educational comics can be designed and used to introduce one of the most commonly discussed topics when the basics of acoustics are taught: decibel level. While they are valuable resources for researchers, these books might appear a little daunting for a young audience or for people who are new to acoustics. In fact, the fields of acoustics cover an especially broad range of subjects and domains, and comprehensive acoustics textbooks are usually quite thick as a consequence. Acoustics is generally defined as the science that deals with the production, transmission, and reception of sound and the understanding and control of its effects.
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