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较高的噪声环境中准确采集畸变产物耳声发射（DPOAE）测量值，用于听力评估和筛查。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测量结果的能力产生不利影响。我们正在努力实现我们的目标，通过开发一个窄带，自适应主动降噪系统，无缝地增强现有的DPOAE测量协议。我们的创新将补充现有的DPOAE测量系统与低成本的声学硬件和先进的信号处理技术。通过降低DPOAE测试频率附近的窄频带中的背景噪声水平，我们能够实现更高的信噪比（SNR）DPOAE测量。增加的SNR导致在相对高噪声环境中获得DPOAE测量的能力，例如新生儿重症监护室和托儿所、儿科医生办公室、野战医院和远程或移动的诊所。我们的第一阶段结果清楚地证明了我们的创新。试点人体受试者测试的结果显示，在一个共同的临床噪声环境中的测量在DPOAE频率的SNR增加约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.