Frequency Response Analysis of Headphone with Ventilation Materials and Artificial Ear
| Autor: | Yao-chung Tsai, 蔡曜鍾 |
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| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 Headphones, earbud-type earphones, and insert-type earphones are currently going through rapidly developing state. To cater the market requirement, to have an edge over competitors and to catch a greater market share, the conventional trial and error method suffers a serious setback owing to increased R&D cost, lengthy development time, and uncertainties. The simulation method can help designer in this situation. In this thesis, the analysis and simulation of a headphone is attempted by an equivalent circuit model. In addition, the equivalent circuit model is developed for coupled system of earphone and artificial ear IEC-60711. The electroacoustic parameters are measured by laser vibrometry (Klippel measurement system) in air are used in equivalent circuit model during simulation. Additionally, earphone’s frequency response is obtained by anechoic chamber measurements by SoundCheck and B&K electroacoustic equipments for verification with simulation response. Subsequently, the effect of acoustic paper (ventilation paper) and foam on the frequency response of earphone is carried out. Corresponding equivalent circuit model is formatted and simulated. The simulated response is compared with the results measured in an anechoic chamber measurement. The multi-stage T-circuit (T-network) is employed in this work to perform simulation. To eliminate variability and uncertainty of human, an artificial ear which is equivalent to human being is used during simulation and actual measurement. The result shows that the proposed analytical model of earphones can shorten development time, rapidly predict the frequency response. Moreover, the ventilation materials and foam also shows improvement in overall performance earphone. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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