Precision Ear Simulator Kits for Acoustic Testing

The human ear is acoustically a remarkably complicated structure that consists of various volumes, intricate channels, and specialized damping mechanisms. This complexity results in a nuanced and complex acoustical impedance that influences how we perceive sound. Furthermore, at higher frequencies, the diffraction that occurs around the outer ear alters the acoustic field. This alteration leads to a unique and individualized response at the inner ear, shaping our auditory experiences in distinctive ways.

In order to be able to effectively compare and quantify the various measurements related to the human ear, a number of international standards and recommendations have established some commonly accepted “ideal” or average ear models. These idealized ears can be simulated through more or less complicated mechanical and acoustical systems, which allow researchers and engineers to conduct their analyses and experiments in a consistent and reliable manner.

The IEC 60318-1 & 2 (60318) coupler is an example of a standardized human ear, having the same acoustic input impedance as an average human ear.

Another example is IEC 60318-4 (former 60711) Occluded-ear simulator for the measurement of earphones coupled to the ear by ear inserts.

Mouth simulators are sound sources for simulating the sound field around the human mouth at close quarters and are used for testing telephone mouthpieces as well as other microphones similarly used in vocal-communication networks. They are built around a loudspeaker and deliver sound signals at a “Mouth Reference Point” in accordance with International Standards IEEE 269, 661 and ITU-T Rec. P51.