Colocated Earphone/Microphone for Active Noise Reduction

用于主动降噪的同位耳机/麦克风

• 批准号: 7106946
• 负责人: ROBERT J KLINE-SCHODER
• 金额: $ 10万
• 依托单位: CREARE, LLC
• 依托单位国家: 美国
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-08-01 至 2007-10-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7106946
• 关键词: artificial membranes; hearing; injury prevention; noise pollution; nonbiomedical equipment; occupational hazard; occupational health /safety; safety equipment; silicon; user protection

DESCRIPTION (provided by applicant): The objective of this project is to design, fabricate, and test colocated earphones/microphones for use in in-ear active noise reduction (ANR) systems. Our innovation is based on a silicon micromachined membrane that serves as both the sensing element for a microphone and simultaneously the actuation surface for the earphone. By colocating the earphone and microphone, our device eliminates the acoustic phase delay between the ANR sensor and actuator, thereby enabling feedback algorithms with higher gain at higher frequency than is possible using separate devices. Current hearing protection designs provide approximately 30 dB of attenuation at the ear. This level of protection is not sufficient to allow long exposures in many industrial noise environments (which may exceed 130 dB) while maintaining the at-the-ear sound levels within prescribed safety limits. In order to keep within current NIOSH and OSHA noise exposure standards, new technologies are needed that will protect individuals from long-term exposure to harmful noise levels that could potentially result in temporary or permanent hearing threshold shifts. During the Phase I project, we will demonstrate the feasibility of our innovation by fabricating and testing prototypical devices. During Phase II, we will optimize the design, fabricate devices, and test the prototypes in in-ear ANR systems.

描述（由申请人提供）：该项目的目标是设计、制造和测试用于入耳式主动降噪（ANR）系统的共置耳机/麦克风。我们的创新是基于硅微加工膜，既作为麦克风的传感元件，同时作为耳机的驱动表面。通过将耳机和麦克风共置，我们的设备消除了ANR传感器和致动器之间的声学相位延迟，从而实现了在更高频率下具有更高增益的反馈算法，而不是使用单独的设备。目前的听力保护设计在耳朵处提供大约30 dB的衰减。这种保护水平不足以在许多工业噪声环境（可能超过130 dB）中长时间暴露，同时将耳旁声级保持在规定的安全限值内。为了保持在当前的NIOSH和OSHA噪声暴露标准内，需要新技术来保护个人免受可能导致暂时或永久性听力阈值偏移的有害噪声水平的长期暴露。在第一阶段项目中，我们将通过制造和测试原型设备来证明我们创新的可行性。在第二阶段，我们将优化设计，制造设备，并在入耳式ANR系统中测试原型。