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研究了诱发电位（ＥＰ）信号潜伏期变化的检测与估计问题．传统的时域平均ＥＰ信号检测方法不能跟踪潜伏期的时变特性，基于相关计算的ＥＰ信号检测方法在存在外界周期性干扰的条件下是很不可靠的．本文提出一种自适应相位谱时间延迟估计方法，用于在低信噪比和低信扰比条件下检测和估计诱发电位信号潜伏期的变化．实验和计算机模拟表明，在信噪比和信扰比均低至－５ｄＢ时，本文方法仍能有效地跟踪ＥＰ信号潜伏期的变化，给出正确的估计结果．这种方法也可以用于时实ＥＰ信号的分析和处理．
The detection and estimation of the change of latency of evoked potential (EP) signal were studied. The traditional time-averaged EP signal detection method can not track the time-varying characteristics of latency, and the EP signal detection method based on correlation calculation is very unreliable under the circumstance of external periodic interference. In this paper, an adaptive phase-to-time delay estimation method is proposed to detect and estimate the change of the latency of the evoked potential signal under the conditions of low SNR and low SINR. Experiments and computer simulations show that the proposed method can still track the change of latency of EP signal effectively when SNR and SNR are as low as -5dB, and give the correct estimation results. This method can also be used for the analysis and processing of real-time EP signals.