Terminology

See the list below:

• Audiogram

  • The audiogram is a chart of hearing sensitivity with frequency charted on the abscissa and intensity on the ordinate (see images shown above). Intensity is the level of sound power measured in decibels; loudness is the perceptual correlate of intensity.
  • For threshold testing intensity, decibels are measured in hearing level (HL), which is based on the standardized average of individuals with normal hearing sensitivity. HL is not equivalent to sound pressure level (SPL), but the American National Standards Institute (ANSI) has defined a relationship between SPL and HL for each audiometric frequency from 250-8000 Hz.