Variation in the Acoustic Measurement of Earbud Earphones in an Anechoic Chamber Due to Changes in the Earphone Placement in Ear Concha
Keywords:earbud earphone, frequency response, Human ear, Sound pressure level, total harmonic distortion
The growth of 4C products encouraged by innovations has stimulated the persistent development of earphones for high-quality sound reproduction. A typical earbud earphone (EE) is located in the concha of the human ear facing an ear-canal. The placement of earphones in the concha plays a remarkable role in the sound pressure level (SPL) response of an earphone. In this study, ten earphones (E1-E10) were tested for the SPL and total harmonic distortion (THD) response using head and torso simulator (HATS) in an anechoic chamber. The SPL and THD responses of all earphones at position-1 and orientation-1 were declared as a benchmark and a characteristic earphone signature. Hence, based on the responses of all earphones at all orientations and positions, it is concluded that there is a variation in the SPL and THD responses due to change in position and orientation of earphone in the concha. Based on the proposition presented in the work and the safe daily sound exposure, it has been resolved that the variation in the SPL affects the perceived loudness of music/sound and can cause significant differences in the daily sound exposure limit for a human being.
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