Agnihotri Chinmayee, Thiyagarajan S, Kalyansundar Archana
Siemens Corporate Research and Technology - India, Bangalore - 560100, India.
Annu Int Conf IEEE Eng Med Biol Soc. 2010;2010:895-8. doi: 10.1109/IEMBS.2010.5627846.
This work focuses on an infant deafness detector unit, using the concept of microphone array. This instrument is based on the principle of evoked acoustic emissions (OAEs). The key feature of the microphone array is its ability to increase signal-to-noise ratio (SNR) and reproducibility of the OAE responses. These further significantly contribute to improve the sensitivity and specificity of the overall system. Low level sound pressure values are recorded by the sensitive microphones in microphone array unit and processed using TI's DSP6416. The sound stimulus transmitted to human ear is generated and controlled by the 6416 DSP (Digital signal processor). Hardware circuit details and the algorithm used in signal processing are discussed in this paper. Standard averaging technique is used in the implemented algorithm. The final result speaks about the hearing capacity of a patient. The proof that the usage of microphone arrays leads to better SNR values than using a single microphone in an OAE probe, is successfully carried out in this work.
这项工作聚焦于一种使用麦克风阵列概念的婴儿耳聋检测装置。该仪器基于诱发耳声发射（OAE）原理。麦克风阵列的关键特性在于其提高耳声发射响应的信噪比（SNR）和可重复性的能力。这些特性进一步显著有助于提高整个系统的灵敏度和特异性。麦克风阵列单元中的灵敏麦克风记录低水平声压值，并使用德州仪器的DSP6416进行处理。传输到人类耳朵的声音刺激由6416 DSP（数字信号处理器）生成和控制。本文讨论了硬件电路细节以及信号处理中使用的算法。所实现的算法采用标准平均技术。最终结果表明了患者的听力能力。在这项工作中成功证明了在耳声发射探头中使用麦克风阵列比使用单个麦克风能获得更好的信噪比。
