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作者认为听力图型(audiometric pattern)只能反映感音神经性聋听力障碍的部分情况,它往往和言语辨别力损害的严重程度不符。这种现象可能和频率分析上的缺陷有关。因此,临界(频)带宽(度)测试或可对内耳病变的诊断和疗效提供新的线索。在一定的范围内,增加噪声的带宽时,响度保持不变,但超过某一点时,噪声的响度突然增加,这某一点的带宽即为临界带宽。临界频带机制常被比作内耳的声滤波系统,它能把声音分解成为连续的频带。作者用中心频率为1000赫,带宽为230赫的噪声作对照信号,带宽分别为50、100、200、
The authors consider the audiometric pattern to reflect only part of the sensorineural deaf hearing impairment, which often does not match the severity of speech discrimination. This phenomenon may be related to the frequency analysis of defects. Therefore, the critical (frequency) bandwidth (degree) test may provide new clues to the diagnosis and treatment of lesions in the inner ear. In a certain range, increasing the noise bandwidth, the loudness remains unchanged, but beyond a certain point, the noise loudness suddenly increases, the bandwidth at this point is the critical bandwidth. The critical band mechanism is often compared to the acoustic filtering system of the inner ear, which breaks down the sound into contiguous bands. The author uses a center frequency of 1000 Hz, the bandwidth of 230 Hz for the control signal noise, the bandwidth was 50,100,200,