| Summary: | 博士 === 逢甲大學 === 機械與航空工程研究所博士班 === 100 === For an ideal active noise reduction (ANR) in-ear earphone, its function should have brilliant sound-pressure response, minimal harmonic distortion, high-fidelity sound reproduction, and meet the ergonomic design of the ear canal for more stable, comfortable wearing, and also blocking the low frequency background noise. Canceling low frequency background noise with ANC technology, the listener can easily enjoy the clear and high quality music. From the “Humanitarianism” and the “Green Concept” point of views, this kind of earphones is a creative design to make people happy and improve their living quality. The ANR in-ear earphone not only provides mobility and noise reduction ability but also offers high fidelity sound quality. Users will no longer need to adjust the sound volume to enjoy music due to the noise interferon when they are in noisy environments. Moreover, these earphones can provide isolation even without listening to music. To this end, the thesis devotes to investigate the effect of electroacoustic components on the characteristics of such active noise reduction in-ear earphones. Below are the contributions of this study:
1. To build up the optimization parameters of design models to the active noise reduction in-ear earphone so that to improve the electroacoustic characters, such as noise reduction effects and the sound quality.
2. To build up the database of parameters for models verification study on the relation between Micro-speaker air vent pipe and electroacoustic characters so that to improve the electroacoustic characters, such as noise reduction effects and the sound quality.
3. To build up the database of parameters for the objective measurement on frequency response curve and subjective listening test on noise reduction performance. It could be easy to verify the noise reduction performance of the active noise reduction in-ear earphone.
4. To build up the database of parameters for the objective measurement on frequency response curve, subjective listening test on sound quality and objective measurement by software on sound quality. It could be easy to verify the sound quality of the active noise reduction in-ear earphone.
This study focuses on the verification of the relation between the electroacoustic components, such as Micro-speaker, Microphone, Sound Chamber & Ventilation Material, and the active noise reduction in-ear earphone performance on the frequency response curve, sound quality & noise reduction effects. In addition, the study focuses on building up the database of parameters for model verifications and measurement solutions on the relationship between Micro-speaker air vent pipe & electroacoustic characters and the objective measurement on the frequency response curve, subjective listening test on sound quality and objective measurement by software on sound quality. Consequently, it will be beneficial to implement a quick design of the active noise reduction in-ear earphone which will provide the mobility convenience and HD audio sound quality at the same time.
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