一般认为，诱发性耳声发射（OAES）反映了神经前的生物机制，对外毛细胞的损害会影响可由OAES测得的耳蜗微机制。畸变产物耳声发射（DP（）AES）可由两个纯音频率fi、fZ引出，它产生于耳蜗内非线性机械反应，且在频率Zfl－fZ时最大。由于其具有频率持异性、宽带和大的动态范围 It is generally believed that evoked otoacoustic emissions (OAES) reflect the pre-neurobiological mechanisms that impair the outer hair cells that affect the cochlear micromechanisms that can be measured by OAES. Distortion Product Otoacoustic Emissions (DP () AES) can be derived from two pure tone frequencies fi, fZ, which arise from non-linear intra-cochlear mechanical reactions and are maximal at frequencies Zfl-fZ. Because of its frequency-diversity, wideband and large dynamic range