Using a parametric filter to average brainstem auditory evoked potentials

We show a new method of BAEP (Brainstem Acoustic Evoked Potentials) signal processing, which can considerably accelerate medical examination. With the standard method, 500 to 2000 realizations of potentials evoked by rectangular acoustic impulse (100 μs width) applied with 30 Hz frequency are measured and then averaged to minimize noise and interference. Measurements are performed for different levels of the stimulation impulse, separately for right and left ear, and the whole procedure repeated. For 1000 realizations the full examination lasts 22 minutes. Such a long time of medical examination, especially in the case of children and babies, requires that the examination should be performed during physiological sleep or deep relax. This causes the medical examination to be onerous for a patient and for a doctor and also to be more costly. In our new method, the BAEP signal is averaged in time with an averaging parametric filter during a single response. Such a signal is repeated at most 30 times to average and reduce distortion