Narrow-Band Active Noise Reduction for DPOAE Measurement

描述（由申请人提供）：本项目的目的是在相对高噪声环境中准确获取失真产品耳声发射（DPOAE）测量值，用于听力评估和筛选。DPOAE测量已被证明是筛查婴儿、儿童和成人听力的有效方法。然而，环境噪声会对成功获得DPOAE测量值的能力产生不利影响。我们正在努力通过开发一种窄带自适应主动降噪系统来实现我们的目标，该系统可以无缝地增强现有的DPOAE测量协议。我们的创新将用低成本的声学硬件和先进的信号处理技术补充现有的DPOAE测量系统。通过降低DPOAE测试频率附近窄频带的背景噪声水平，我们可以实现更高的信噪比（SNR） DPOAE测量。增加的信噪比使得在相对高噪声环境（如新生儿重症监护病房和托儿所、儿科医生办公室、野战医院和远程或移动诊所）中能够获得DPOAE测量值。我们的I期结果清楚地展示了我们的创新。人体试验结果显示，在常见的临床噪声环境中，DPOAE频率下的信噪比增加了约10 dB。

DESCRIPTION (provided by applicant): The aim of this project is to enable accurate acquisition of distortion product otoacoustic emission (DPOAE) measurements in relatively high noise environments for use in hearing evaluations and screening. DPOAE measurements have been shown to be an effective and efficient method for screening infant, child, and adult hearing. Environmental noise, however, can adversely affect the ability to successfully obtain DPOAE measurements. We are working to achieve our aim by developing a narrow-band, adaptive active noise reduction system that seamlessly augments existing DPOAE measurement protocols. Our innovation will supplement existing DPOAE measurement systems with both low-cost acoustic hardware and advanced signal processing techniques. By reducing background noise levels in a narrow frequency band near the DPOAE test frequencies, we enable higher signal-to-noise ratio (SNR) DPOAE measurements. The increased SNR results in the ability to obtain DPOAE measurements in relatively high noise environments such as the newborn intensive care unit and nursery, offices of pediatricians, field hospitals, and remote or mobile clinics. Our Phase I results clearly demonstrated our innovation. Results of pilot human subject tests show an increase of approximately 10 dB in the SNR at the DPOAE frequency for measurements in a common clinical noise environment.