Analog and zero phase-shift digital filtering of the auditory brain stem response waveform.

Auditory brain stem response waveforms, derived from normal ears, were analyzed with a computer-based digital filtering program as a means of systematically evaluating the effects of phase-shift distortion. Off-line analysis involved the stimulated responses of a Butterworth-type filter at five high-pass and four low-pass frequencies, three filter slopes, and standard versus zero phase-shifting. Phase-shift, as seen with analog filters, proved to be a major cause of waveform distortion including significant latency and amplitude changes. A discussion on the need and use of digital filtering as well as suggested analog filter parameter settings is included.

[1]  M Scherg,et al.  Effects of high-pass filter frequency and slope on BAEP amplitude, latency and wave form. , 1984, Electroencephalography and clinical neurophysiology.

[2]  K. Kavanagh,et al.  Auditory Brainstem and Middle Latency Responses , 1984 .

[3]  A R Møller,et al.  Improving brain stem auditory evoked potential recordings by digital filtering. , 1983, Ear and hearing.

[4]  M Scherg,et al.  Simultaneous recording and separation of early and middle latency auditory evoked potentials. , 1982, Electroencephalography and clinical neurophysiology.

[5]  E R John,et al.  Application of digital filtering and automatic peak detection to brain stem auditory evoked potential. , 1982, Electroencephalography and clinical neurophysiology.

[6]  J. Robert Boston,et al.  Spectra of Auditory Brainstem Responses and Spontaneous EEG , 1981, IEEE Transactions on Biomedical Engineering.

[7]  J R Boston,et al.  Effects of analog and digital filtering on brain stem auditory evoked potentials. , 1980, Electroencephalography and clinical neurophysiology.

[8]  W Melnick,et al.  American National Standard specifications for audiometers. , 1971, ASHA.

[9]  S. Mason.  Effects of high-pass filtering on the detection of the auditory brainstem response. , 1984, British journal of audiology.

[10]  T. Suzuki,et al.  Power spectral analysis of auditory brain stem responses to pure tone stimuli. , 1982, Scandinavian audiology.

[11]  P Osterhammel,et al.  The unsolved problems in analog filtering on the auditory brain stem responses. , 1981, Scandinavian audiology. Supplementum.

[12]  E. Laukli,et al.  Early auditory-evoked responses: filter effects. , 1981, Audiology : official organ of the International Society of Audiology.

[13]  H. Davis,et al.  A slow brain stem response for low-frequency audiometry. , 1979, Audiology : official organ of the International Society of Audiology.

[14]  P. Rudge,et al.  Abnormalities of the auditory evoked potentials in patients with multiple sclerosis. , 1977, Brain : a journal of neurology.

[15]  T. Suzuki,et al.  Effect of high-pass filter on auditory brain stem responses to tone pips. , 1977, Scandinavian audiology.

[16]  D L Jewett,et al.  Auditory-evoked far fields averaged from the scalp of humans. , 1971, Brain : a journal of neurology.