Temporal aspects of suppression in distortion-product otoacoustic emissions

Rodríguez, Joyce; Neely, Stephen T.

doi:10.1121/1.3575553

Cited by 3 publications

(2 citation statements)

References 68 publications

(98 reference statements)

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“…[20]. Suppressive effects are applied to these gains instantaneously because measurements of the temporal features of suppression suggest that suppression is essentially instantaneous [26] [27]. Previous studies have suggested that instantaneous compression has deleterious effects on perceived sound quality [28].…”

Section: Introductionmentioning

confidence: 99%

Signal-Processing Strategy for Restoration of Cross-Channel Suppression in Hearing-Impaired Listeners

Rasetshwane

Gorga

Neely

2014

IEEE Trans. Biomed. Eng.

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Because frequency components interact nonlinearly with each other inside the cochlea, the loudness growth of tones is relatively simple in comparison to the loudness growth of complex sounds. The term suppression refers to a reduction in the response growth of one tone in the presence of a second tone. Suppression is a salient feature of normal cochlear processing and contributes to psychophysical masking. Suppression is evident in many measurements of cochlear function in subjects with normal hearing, including distortion-product otoacoustic emissions (DPOAEs). Suppression is also evident, to a lesser extent, in subjects with mild-to-moderate hearing loss. This paper describes a hearing-aid signal-processing strategy that aims to restore both loudness growth and two-tone suppression in hearing-impaired listeners. The prescription of gain for this strategy is based on measurements of loudness by a method known as categorical loudness scaling. The proposed signal-processing strategy reproduces measured DPOAE suppression tuning curves and generalizes to any number of frequency components. The restoration of both normal suppression and normal loudness has the potential to improve hearing-aid performance and user satisfaction.

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Section: Introductionmentioning

confidence: 99%

Signal-Processing Strategy for Restoration of Cross-Channel Suppression in Hearing-Impaired Listeners

Rasetshwane

Gorga

Neely

2014

IEEE Trans. Biomed. Eng.

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“…One possible explanation is that listeners can use information available outside the band containing the signal to improve performance (Buus et al, 1986;Richards and Nekrich, 1993), another possibility is suppression (Houtgast, 1972(Houtgast, , 1977Plack et al, 2002;Yasin and Plack, 2003, 2005. Although auditory suppression is instantaneous (Rhode and Cooper, 1993), if the effects of suppression persist after signal offset (Rodriguez and Neely, 2011), then it might differentially affect signal and masking noise in the B-fringe condition.…”

Section: B Effect Of Forward and Backward Noise Fringes On The Bmldmentioning

confidence: 96%

The effects of noise-bandwidth, noise-fringe duration, and temporal signal location on the binaural masking-level difference

Yasin¹,

Henning²

2012

The Journal of the Acoustical Society of America

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The effects of forward and backward noise fringes on binaural signal detectability were investigated. Masked thresholds for a 12-ms, 250-Hz, sinusoidal signal masked by Gaussian noise, centered at 250 Hz, with bandwidths from 3 to 201 Hz, were obtained in N(0)S(0) and N(0)S(π) configurations. The signal was (a) temporally centered in a 12-ms noise burst (no fringe), (b) presented at the start of a 600-ms noise burst (backward fringe), or (c) temporally centered in a 600-ms noise burst (forward-plus-backward fringe). For noise bandwidths between 3 and 75 Hz, detection in N(0)S(0) improved with the addition of a backward fringe, improving further with an additional forward fringe; there was little improvement in N(0)S(π). The binaural masking-level difference (BMLD) increased from 0 to 8 dB with a forward-plus-backward fringe as noise bandwidths increased to 100 Hz, increasing slightly to 10 dB at 201 Hz. This two-stage increase was less pronounced with a backward fringe. With no fringe, the BMLD was about 10-14 dB at all bandwidths. Performance appears to result from the interaction of across-time and across-frequency listening strategies and the possible effects of gain reduction and suppression, which combine in complex ways. Current binaural models are, as yet, unable to account fully for these effects.

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Comments on forward pressure and other reflectance-based quantities for delivering stimuli to the ear

Nørgaard

Bray

2023

The Journal of the Acoustical Society of America

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The forward pressure has been proposed as an “optimal” reflectance-based quantity for delivering stimuli to the ear during evoked otoacoustic-emission measurements and audiometry. It is motivated by and avoids detrimental stimulus-level errors near standing-wave antiresonance frequencies when levels are adjusted in situ. While enjoying widespread popularity within research, the forward pressure possesses certain undesirable properties, some of which complicate its implementation into commercial otoacoustic-emission instruments conforming to existing international standards. These properties include its inability to approximate the total sound pressure anywhere in the ear canal and its discrepancy from the sound pressure at the tympanic membrane, which depends directly on the reflectance. This paper summarizes and comments on such properties of the forward pressure. Further, based on previous published data, alternative reflectance-based quantities that do not share these properties are investigated. A complex integrated pressure, with magnitude identical to the previously proposed scalar integrated pressure, is suggested as a suitable quantity for avoiding standing-wave errors when delivering stimuli to the ear. This complex integrated pressure approximates the magnitude and phase of the sound pressure at the tympanic membrane and can immediately be implemented into standardized commercial instruments to take advantage of improved stimulus-level accuracy and reproducibility in the clinic.

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Temporal aspects of suppression in distortion-product otoacoustic emissions

Cited by 3 publications

References 68 publications

Signal-Processing Strategy for Restoration of Cross-Channel Suppression in Hearing-Impaired Listeners

Signal-Processing Strategy for Restoration of Cross-Channel Suppression in Hearing-Impaired Listeners

The effects of noise-bandwidth, noise-fringe duration, and temporal signal location on the binaural masking-level difference

Comments on forward pressure and other reflectance-based quantities for delivering stimuli to the ear

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