Abstract
Waveforms and power spectra of acoustic signals used to elicit the auditory brainstem response were analyzed with respect to electrical and acoustical differences. Signals were of alternating polarity and included a dc pulse, tone bursts of 0.5 and 4.0 kHz, a 4.0-kHz tone pip, and a 2.0-kHz logon. The earphone faithfully transduced the temporal dimension of the 5.0-ms bursts and pips while the logon (450 μs) and the click (100 μs) durations were on the order of ten times greater than the electrical input. Earphone distortion included the loss of well-defined energy peaks and a spread of energy to higher frequencies. Signal polarity was not maintained through the earphone.
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