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采用Fridman提出的相位谱分析方法——同步度（SM）测试法，对40dBnHL短声诱发的正常耳听觉脑干反应（ABR）进行相位谱构型分析。40耳统计表明，ABR相位谱主要包含4个频域成分，即A：0～160Hz、B：160～440Hz、C：440～930Hz和D：930～1370Hz，以各成分谱参量——SM的平均值和标准差的差值作为鉴别中高频听力损失的标准值。对测试组各聋耳（49耳）40dBnHL短声诱发ABR进行相位谱构型分析，计算上述各主要相位谱成分的SM值，并同相应成分的标准值进行比较，以判定中高频性耳聋。各谱成分对测试耳的正确诊断丰分别为A：59．2％、B：51．0％、C：95．9％和D：44．9％。结果表明，C成分是ABR相位谱的唯一特征成分，其SM值能有效确定中高频听力损失，可作为客观诊断中高频性耳聋的临床指标。
Phase spectral analysis of normal auditory brainstem response (ABR) induced by 40 dBnHL short-tone was performed by using the phase spectrum analysis method proposed by Fridman - Synchronization (SM) test. 40 ear statistics show that the ABR phase spectrum mainly contains four frequency domain components, namely, A: 0-160Hz, B: 160-440Hz, C: 440-930Hz and D: 930-1370Hz, The difference between the average and standard deviation as a standard value to identify hearing loss at high frequency. The phase spectrum configuration of ABR was measured in 40 dBnHL short-sighted ears of each deaf ear (49 ears) in the test group. The SM values of the above-mentioned major phase components were calculated and compared with the standard values of the corresponding components to determine the middle- and high-frequency deafness. The correct diagnostic abundance of each spectral component for the test ear was 59.2% for A, 51.0% for B, 95.9% for C, and 44.9% for D, respectively. The results show that the C component is the only characteristic component of the ABR phase spectrum, and its SM value can effectively determine the hearing loss at mid-high frequency, which can be used as a clinical index to objectively diagnose mid-high frequency deafness.