Audiometry is the general term applied to a number of tests used to measure hearing.

An audiometer is an essential instrument for conducting most audiometric tests. The audiometer is basically a device that generates pure tones of known level and frequency, and delivers these to the patient through either a headphone or a bone conduction vibrator.

On an audiometer, the levels are given as Hearing Level, dB (HL). In this way, a normal hearing person will be able to hear tones at and above a 0 dB HL level.

Since these levels are average levels measured in a standard coupler, the actual sound levels at the patient's eardrum can differ considerably. One might expect up to as much as 15 dB individual deviation from the average.

Instead ...

Get Consumer Electronics now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.