AudiogramAn audiogram is a graph which charts the quietest sounds a person can hear. The graph is represented by frequency (Hz) and sound intensity - loudness (dB). An audiogram is produced by testing the person in a sound treated room, with no other background noise, using pure tones directed through headphones or sound field via speakers. The audiogram does not demonstrate how well a person can understand connected speech. It does give a basic understanding of what a person can or cannot hear through their hearing.

The chart shown here has at the top a line of results which are those of the threshold hearing level of a normally hearing person. The colour bands are labeled with the degrees of hearing loss that can be experienced-Mild (20dB-40dB), Moderate (40dB-70dB), Severe (70dB-90dB) and Profound (90dB plus).

Also shown here are the typical frequencies and loudness levels of vowels and consonants and also other life sounds.