自适应滤波提取耳蜗微音器电位初探

为解决表面电极引导耳蜗微音器电位的结果中存在刺激伪迹信号的状况，探讨了用自适应滤波处理抵消刺激伪迹信号提取的方法，结果发现：正常耳的ＣＭ较同侧表面电极引导的波形有一定的滞后时间，２ｋＨｚ以上的神经动作电位波形分化明显；３１耳极重度感音神经性聋和１１耳中度或中重度感音神经性聋耳各频率的ＣＭ消失，９耳极重度感音神经性聋和２９中度和中重度感音神经性聋各频率存在较好的ＣＭ波形。提示：不同程度的感音神经性聋

Study on cochlear microphonic potentials obtained by adaptive filtering technique]

In order to delete the contamination of acoustic stimulus artefact in average evoked cochlear microphonics by surface recording, an application of adaptive filtering technique for cancelling the stimulus artefact from the cochlear microphonics was proposed. The results demonstrated that in normal hearing ears, the cochlear microphonic potentials (CM) which was obtained by adaptive filtering technique was later than the ipsilateral response, whereas the AP response could be seen in the ipsilateral response to 2 kHz, 4 kHz and 8 kHz stimuli. In 31(77.5%) ears with profound sensorineural hearing loss and 29(27.5%) ears with moderate to severe sensorineural hearing loss, the CM was absent, but in the other ears the CM was as clear as in ears with normal hearing. It suggests that by this technique sensorineural hearing loss can be further differentiated into two kinds: neural hearing loss and sensory hearing loss.