from the dac 34 was a 34 click 34 comprising a 100 microsecond rectangular pulse calibrated to produce a 30 db nhl peak rarefaction pressure in a reduced volume ha 1 acoustic cavity the units 34 db nhl 34 indicate decibels re normal adult thresholds the 30 db nhl stimulus was calibrated to have peak sound pressure level of 65 db pspl which is equivalent to 35 6 millipascal in the preferred embodiment the audio stimulus was transmitted to the testing subject by means of earphones 32 but there could be any number of alternatives for transmitting audio signals the dsp board was programmed by the software to use a 50 khz sample rate for both stimulus generation and abr recording as mentioned only the recording of the electrical potential from vertex c7 to mastoid was used in the analyses discussed herein the novel computer routine utilized to implement the analysis of the present invention is designated the auditory brainstem response averager abrav fig2 a b illustrate a simple flowchart of the computer routine used to conduct the analysis of the test data according to the present invention abrav is a routine for measuring and displaying auditory brainstem response data on a pc compatible computer abrav works with same hardware described above abrav has the ability to.