The Performance and Frequency Response Analysis of In-Ear Earphones with HATS

• Main Authors: Li-Yu Chen, 陳立祐
• Other Authors: Ruey-Bin Yang
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/28268828641483401038

碩士 === 逢甲大學 === 電聲碩士學位學程 === 99 === The objective of this thesis is to perform the frequency response analysis of in-ear earphones with an aim to improve the design and performance of earphone microspeakers. Klippel system is used to measure the lumped parameters of commercial in-ear earphones. SoundCheck system in an anechoic chamber is also used to measure the sound pressure level of earphones. Based on a lumped-parameter method, the influence of closed or open of the front or back vent holes, paper screens, earplug types and wire screens on the performance of the in-ear earphones is investigated. To simulate human acoustic impedance presented in the ear canal, B&K HATS (Head and Torso Simulator) is used for the testing of in-ear earphones. The influence of the ear canal is considered in the development of the equivalent circuit model of the in-ear earphones to improve the accuracy of analysis. The measured sound pressure level and predicted results showed satisfactory agreement.