Moments of click-evoked otoacoustic emissions in human ears: group delay and spread, instantaneous frequency and bandwidth

A click-evoked otoacoustic emission (CEOAE) has group delay and spread as first- and second-order temporal moments varying over frequency, and instantaneous frequency and bandwidth as first- and second-order spectral moments varying over time. Energy-smoothed moments were calculated from a CEOAE dat...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2012-11, Vol.132 (5), p.3319-3350
Main Author: Keefe, Douglas H
Format: Article
Language:English
Subjects:
Acoustic Stimulation
Adolescent
Adult
Age Factors
Aged
Aging
Audiometry
Auditory Perception
Auditory Threshold
Case-Control Studies
Cochlea - physiopathology
Female
Hearing Loss, Sensorineural - physiopathology
Hearing Loss, Sensorineural - psychology
Humans
Male
Middle Aged
Otoacoustic Emissions, Spontaneous
Persons With Hearing Impairments - psychology
Sex Factors
Signal Processing, Computer-Assisted
Time Factors
Young Adult
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Summary:A click-evoked otoacoustic emission (CEOAE) has group delay and spread as first- and second-order temporal moments varying over frequency, and instantaneous frequency and bandwidth as first- and second-order spectral moments varying over time. Energy-smoothed moments were calculated from a CEOAE database over 0.5-15 kHz bandwidth and 0.25-20 ms duration. Group delay and instantaneous frequency were calculated without phase unwrapping using a coherence synchrony measure that accurately classified ears with hearing loss. CEOAE moment measurements were repeatable in individual ears. Group delays were similar for CEOAEs and stimulus-frequency OAEs. Group spread is a frequency-specific measure of temporal spread in an emission, related to spatial spread across tonotopic generation sites along the cochlea. In normal ears, group delay and spread increased with frequency and decreased with level. A direct measure of cochlear tuning above 4 kHz was analyzed using instantaneous frequency and bandwidth. Synchronized spontaneous OAEs were present in most ears below 4 kHz, and confounded interpretation of moments. In ears with sensorineural hearing loss, group delay and spread varied with audiometric classification and amount of hearing loss; group delay differed between older males and females. CEOAE moments reveal clinically relevant information on cochlear tuning in ears with normal and impaired hearing.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.4757734