Audiometry

This tests the threshold for the detection of sounds. The following are normally measured: Air conduction threshold; Bone conduction threshold; Speech reception threshold; Discrimination scores. Special tests include: Tone decay

Speech increment sensitivity Binaural loudness balance The loudness of sound is measured on the decibel scale, which: Is logarithmic and non-linear; Involves a ratio of two sounds;

Uses different reference levels including sound pressure, intensity, hearing and sensation levels;

Has the just noticeable difference in intensity between two sounds as around one decibel;

Has a frequency scale is that based on the musical scale, or octave, a logarithmic scale with a base of two.

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