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Stimulus-frequency otoacoustic emissions measured with amplitude-modulated suppressor tones (L)
Authors:Neely Stephen T  Johnson Tiffany A  Garner Cassie A  Gorga Michael P
Institution:Boys Town National Research Hospital, 555 North 30th Street, Omaha, Nebraska 68131, USA.
Abstract:Stimulus-frequency otoacoustic emissions (SFOAEs) are typically derived as the difference in sound pressure in the ear canal with and without a suppressor tone added to the probe tone. A novel variation of this method applies a sinusoidal amplitude modulation (AM) to the suppressor tone, which causes the SFOAE to also be modulated. The AM-SFOAE can be separated from the probe frequency using spectral methods. AM-SFOAE measurements are described for four normal-hearing subjects using 6-Hz AM. Because the suppressor modulation is at a higher rate, the AM-SFOAE technique avoids the confounding influence of heartbeat, which also modulates the probe tone.
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