Time- and intensity-dependent low-pass filtering of auditory brain stem responses.
A new method of filtering auditory brain stem responses (ABR), which is time-and intensity-dependent, is proposed. The epoch containing the averaged response is divided up into 128 overlapping segments and each segment is differently filtered. The characteristics of a filter that is applied to a segment of the response are derived from the time-dependent spectral composition of normal ABRs at the appropriate stimulus intensity. After filtering, the segments are added together to yield a response with no significant amplitude and/or phase distortion, and with distinctly pronounced peaks that are excellently suitable for evaluation with an automated system.
D000162:Acoustics; D001933:Brain Stem / Q000502:physiology*; D002648:Child; D002675:Child, Preschool; D005072:Evoked Potentials, Auditory; D005583:Fourier Analysis; D006801:Humans; D008722:Methods; D013997:Time Factors