Abstract
In the study, a Hybrid Model consisting of T/S parameters and Finite Element Method is proposed to simulate acoustic radiation characteristics of headphones, with verifications based on comparisons with measurement results. In addition to discussing the predictive ability of this model for the acoustic characteristics of microspeaker, Brüel & Kjær Head & Torso Simulator, artificial ear, and standard IEC 711 coupler were used to simulate and analyze the acoustic characteristics of headphone in pressure field. Moreover, the impact of vented rear chamber on acoustic characteristics is discussed and relevant simulation and measurement results are compared. Based on the results, this Hybrid Model accurately predicts acoustic radiation characteristics of microspeakers, including resonance frequency and edge mode frequency characteristics, in addition to the free field performance of headphone front and rear chambers and the pressure field performance of entire headphone on human head simulator. This predictive ability is especially significant at frequencies below 10 kHz, including the effective elevation of low frequency pressure performance of vented rear chamber at under 200 Hz and the changes in pressure valley values at mid frequency of around 300 Hz.
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