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June 2011 - March 2016
March 2008 - February 2015
Publications
Publications (29)
Swept-sines provide a tool for fast and high-resolution measurement of evoked otoacoustic emissions. During the measurement, a response to swept-sine(s) is recorded by a probe placed in the ear canal. Otoacoustic emissions can then be extracted by various techniques, e.g., Fourier analysis, the heterodyne method, and the least-square-fitting (LSF)...
The basilar membrane in the cochlea can be modeled as an array of fluid coupled segments driven by stapes vibration and by the undamping nonlinear force simulating cochlear amplification. If stimulated with two tones, the model generates additional tones due to nonlinear distortion. These distortion products (DPs) can be transmitted into the ear ca...
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ABSTRACT
Vetešník and Gummer [J. Acoust. Soc. Am. 131, 3914–3934 (2012)] obtained a stationary solution for distortion products (DPs) in a two-dimensionalcochlear model in which the impedance of the basilar membrane varied smoothly along its length. Their solution was used to study the dependence of the nonlinear-distortion source...
Stimulus-frequency otoacoustic emissions (SFOAEs) are generated by coherent reflection of forward traveling waves by perturbations along the basilar membrane. The strongest wavelets are backscattered near the place where the traveling wave reaches its maximal amplitude (tonotopic place). Therefore, the SFOAE group delay might be expected to be twic...
The amplitudes of distortion-product otoacoustic emissions (DPOAEs) may abruptly decrease even though the stimulus level is relatively high. These notches observed in the DPOAE input/output functions or distortion-product grams have been hypothesized to be due to destructive interference between wavelets generated by distributed sources of the nonl...
Deteriorated speech comprehension is a common manifestation of the age-related decline of auditory functions (presbycusis). It could be assumed that when presbycusis is accompanied by tinnitus, general hearing functions, and particularly comprehension of speech in quiet and speech in noise (SIN), will be significantly affected. In this study, speec...
Distortion product otoacoustic emissions (DPOAEs) are evoked by two stimulus tones with frequency f1 and f2 of ratio f2/f1 in the range between approximately 1.05 and 1.4. This study theoretically and experimentally analyzes the cubic 2f1−f2 DPOAE for different stimulus levels of one of the tones while the other is constant. Simulations for f2/f1 o...
Age related hearing loss (presbycusis) is one of the most common sensory deficits in the aging population. The main subjective ailment in the elderly is the deterioration of speech understanding, especially in a noisy environment, which cannot solely be explained by increased hearing thresholds. The examination methods used in presbycusis are prima...
This paper presents a rate-code model of binaural interaction inspired by recent neurophysiological findings. The model consists of a peripheral part and a binaural part. The binaural part is composed of models of the medial superior olive (MSO) and the lateral superior olive (LSO), which are parts of the auditory brainstem. The MSO and LSO model o...
A two-dimensional nonlinear cochlear model was used to study the dependence of the nonlinear-distortion component of cubic distortion product otoacoustic emissions (DPOAEs) on the levels of the primary tones: f 1 , f 2 . DPOAE was simulated for a fixed frequency ratio between the primaries f 2 /f 1 = 1.2 and for two amplification gains at f 2 of 1....
It has been suggested that the stimulus frequency otoacoustic emissions (SFOAEs) are generated due to coherent reflections of forward-traveling waves. In this paper, the emissions were simulated by a two-dimensional hydrodynamic cochlea model with parameters based on real dimensions of the human cochlea. Simulations were done using a low-level pure...
The distortion product otoacoustic emissions (DPOAEs) are generated when the cochlea is stimulated by two pure tones with different frequencies f1 and f2. Onset of the DPOAE amplitude may have a nonmonotonic complex shape when the f2 is pulsed during a stationary f1 input. Observed complexities have been explained as (1) due to the secondary source...
For a given type of headphones the sound pressure levels of pure tones at which an adequate number of young listeners without hearing loss just perceived the tones are called Reference Equivalent Threshold Sound Pressure Levels (RETSPLs). RETSPLs for the Sennheiser HD 650 circumaural headphones were measured in this paper for 25 young listeners who...
THIS STUDY IS FOCUSED ON THE PERCEIVED roughness of two simultaneous harmonic complex tones with ratios between their fundamental frequencies set to create intervals on just-tempered (JT) and equal-tempered (ET) scales. According to roughness theories, ET intervals should produce more roughness. However, previous studies have shown the opposite for...
Poster presented at the Mechanics of Hearing 2017 meeting
Presentation at the Mechanics of Hearing 2017 meeting
A poster presented at the Basic Auditory Science meeting (5-6/09/2016, Cambridge, UK)
This study describes a system which detects clicks in sound (audible degradations). The system is based on a computational model of the peripheral ear. In order to train and verify the system , a listening test was conducted using 89 short samples of analog (vinyl) records. The samples contained singing voice, music (rock'n'roll), or both. We rando...
The term roughness is used to describe a specific sound sensation which may occur when listening to stimuli with more than one spectral component within the same critical band. It is believed that the spectral components interact inside the cochlea, which leads to fluctuations in the neural signal and, in turn, to a sensation of roughness. This stu...
It has been shown that masked thresholds for complex tone maskers may depend on the relative phase between the spectral components of said maskers. Since these masker phase effects are less pronounced in hearing-impaired listeners, it indicates a possible role of peripheral compression.
In order to study this phenomenon, we used a previously publis...
Hopkins and Moore [J. Acoust. Soc. Am. 122, 1055-1068 (2007)] measured the ability of hearing-impaired (HI) listeners to discriminate harmonic (H) from inharmonic (I) – all harmonics shifted upwards by the same amount in Hz – complexes. The complexes were composed of many bandpass-filtered harmonics (shaped stimuli) or five equal-amplitude harmonic...
Two nuclei in each hemisphere, the medial superior olive (MSO) and the lateral superior olive (LSO), are responsible for decoding interaural time difference (ITD) and interaural level difference (ILD), respectively [1]. This allows us to localize sound sources in the horizontal plane.
Neurons in the MSO are usually modeled as coincidence detectors...
Schroeder phase maskers are harmonic complex tones with starting phases of individual harmonics given by an equation proposed by Schroeder [1]. Relative phase between the harmonics may affect masking thresholds. This masker phase effect depends on the masker level: difference between masking thresholds increases with increasing level. This study us...
Vencovský [12] introduced a new roughness model and showed its performance in comparison with listening
tests for three types of complex acoustics stimuli: amplitude-modulated harmonic complex tones, real samples of pathological voices (sustained vowel /a/), harmonic intervals of the chromatic scale composed of two harmonic complex tones (dyads). T...
On-line at http://www.fa2014.agh.edu.pl/fa2014_cd/article/RS/R17_3.pdf A term roughness is often used in conjunction with acoustic stimuli whose envelope or frequency rapidly fluctuates in time. It was first introduced by von Helmholtz to describe harsh, rattling and often unpleasant sound sensation usually accompanying these stimuli. This study in...
On-line at http://www.conforg.fr/isma2014/cdrom/data/articles/000092.pdf A roughness model composed of a physiological auditory model and an algorithm calculating roughness from the envelope of the auditory model output signal is described in the study. The roughness model is sensitive to phase changes between the spectral components and to shape o...
