Ravazzani P, Tognola G, Grandori F, Ruohonen J
Department of Biomedical Engineering, Polytechnic of Milan, Italy.
IEEE Trans Biomed Eng. 1998 Sep;45(9):1089-96. doi: 10.1109/10.709551.
This paper implements a filtering technique to enhance the signal-to-noise ratio (SNR) and, in turn, the detection of transient-evoked otoacoustic emissions (TEOAE's), generated by healthy human cochlea. One can increase the SNR by compiling an image of recorded TEOAE from more than one stimulus intensity, averaged over a few sweeps, which can be further processed by means of two-dimensional spatial mean filters. Averaging some 60 sweeps recorded to stimuli at several intensity levels requires one-forth of the collection time needed for a classical set of responses (average of 260 sweeps), and obtains approximately the same final SNR. The relation between the performances of the proposed technique and the SNR of the rapidly acquired responses before filtering is also investigated.
本文实现了一种滤波技术，以提高信噪比（SNR），进而增强对健康人耳蜗产生的瞬态诱发耳声发射（TEOAE）的检测。通过从多个刺激强度下记录的TEOAE图像进行编译，在几次扫描中进行平均，可以提高信噪比，然后可以通过二维空间均值滤波器对其进行进一步处理。在几个强度水平下对刺激记录的约60次扫描进行平均，所需的采集时间仅为经典响应集（260次扫描的平均值）所需采集时间的四分之一，并且最终获得的信噪比大致相同。本文还研究了所提出技术的性能与滤波前快速采集响应的信噪比之间的关系。
