What is ENT - Can you explain what a decibel is?
A logarithmic unit of measurement for the loudness of sound, a decibel (dB) is an arbitrary number that was developed in the early 20th century. When presenting a value in decibels, it is essential to specify which decibel scale was used as a reference. Since there are multiple decibel scales that can be used to quantify the loudness of a sound and the degree to which it affects hearing, it is important to note which scale was used. For instance, the level of hearing is measured on a physical scale in decibels sound pressure level (dB SPL), whereas the level of environmental noises is measured on a biological scale in decibels hearing level (dB HL). (dB SPL). The human ear is not equally responsive to all frequencies; rather, it is better able to hear frequencies in the middle of the audible spectrum than it is to hear frequencies in the lower or higher end of the spectrum. Hearing that is considered normal has a sound pressure level (SPL) of approximately 45 dB at 125 Hz, 7 dB at 1000 Hz, and 16 dB at 6000 Hz. Hearing that is considered to be typical spans the entire frequency spectrum and corresponds to a reference level of 0 dB HL.
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