Abstract
Stimulus frequency otoacoustic emissions (SFOAE) are generated by single tones. This is both an advantage and a disadvantage. The advantage is that they are more likely to be primarily generated from a more limited region of the cochlea than other types of OAE. The disadvantage is that when tone pulses are used, they occur at the same frequency and time as the stimulus, making it very difficult to separate the OAE from the signal, unless one uses suppression. The SFOAE is generated in the cochlea and has to travel along the basilar membrane before being measured in the ear canal. Cochlear travel times mean that the SFOAE is always delayed relative to the stimulus. The delay is frequency dependent. We have modified the continuously sweeping tone procedure developed in our lab for evaluating DPOAE to separate the stimulus and SFOAE. The LSF procedure was modified to permit dynamic fitting of the delay of a given signal component permitting the extraction of the time varying SFOAE.
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