The validity of transient-evoked otoacoustic emissions (TEOAEs), as implemented on the Mimosa Acoustics T2K Measurement System (v. 3.1.3), was assessed for a variety of transient stimuli. Stimuli evaluated included clicks, Dau chirps, and Shera chirps, all with bandwidth 1 to 5 kHz and stimulus levels from 38 to 53 dB SPL, and clicks with bandwidth 1 to 2.5 kHz. A new form of in-the-ear calibration was used that corrected the stimulus to give the desired spectrum and group delay. Both linear and nonlinear modes were evaluated. Validity testing was done using moderate-to-profoundly hearing-impaired ears, which should not produce TEOAEs. Any measurable response is an indication of artifact. Validity was established for all TEOAE stimuli up to 50 dB SPL(rms) when testing was done in nonlinear mode. Validity could not be established for any stimulus when testing was done in linear mode, where linear artifact was not subtracted out. Spectral calibration showed more artifacts at lower frequencies and fewer artifacts at higher frequencies, when compared with wideband calibration for clicks measured in linear mode. Chirp stimuli produced fewer artifacts than clicks, presumably due to their lower crest factors and longer durations. Minor enhancements to the spectral calibration should improve validity further. Stimulus Bandwidth (kHz) RMS Stimulus Level (dB SPL) Peak Stimulus Level 2 (dB pSPL) Description Click 1 to 5
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