Day 263~366

An audiogram is a graph that shows the audible threshold for standardized frequencies as measured by an audiometer. The Y axis represents intensity measured in decibels and the X axis represents frequency measured in Hertz.The threshold of hearing is plotted relative to a standardised curve that represents ‘normal’ hearing, in dB(HL). Audiograms are set out with frequency in hertz (Hz) on the horizontal axis, most commonly on a logarithmic scale, and a linear dBHL scale on the vertical axis. For humans, normal hearing is between −10 dB(HL) and 20 dB(HL), although 0 dB from 250 Hz to 8 kHz is…