Experiments and model calculations were performed to study the influence of within-channel cues versus across-channel in comodulation masking release (CMR). A class CMR experiments is considered that are characterized by a single (unmodulated or modulated) bandpass noise masker with variable bandwidth centered at signal frequency. modulation-filterbank suggested Dau et al. [J. Acoust. Soc. Am. 102, 2892-2905 (1997)] was employed quantitatively predict experimental data. Effects varying...

A model is presented which calculates the intrinsic envelope power of a bandpass noise carrier within passband hypothetical modulation filter tuned to specific frequency. Model predictions are compared experimentally obtained amplitude (AM) detection thresholds. In experiment 1, thresholds for rates 5, 25, and 100 Hz imposed on Gaussian with fixed upper cutoff frequency 6 kHz bandwidth in range from 1 6000 were obtained. 2, three noises different spectra fluctuations served as carrier:...

The frequency selectivity for amplitude modulation applied to tonal carriers and the role of beats between modulators in masking were studied. Beats masker signal as well intrinsic envelope fluctuations narrow-band-noise are characterized by “second-order” (referred “venelope” following). In experiment 1, masked threshold patterns (MTPs), representing a function masker-modulation frequency, obtained signal-modulation frequencies 4, 16, 64 Hz presence modulation, both same sinusoidal carrier....

A model of the cochlea was used to bridge gap between approaches commonly investigate phenomena related otoacoustic emissions and more filter-based often in psychoacoustics. In present study, a nonlinear active one-dimensional transmission line developed that accounts for several aspects physiological data with single fixed parameter set. The shows plausible excitation patterns an input-output function similar linear-compressive-linear as hypothesized realistic results two-tone suppression...

This paper describes the estimation of hearing thresholds in normal-hearing and hearing-impaired subjects on basis multiple-frequency auditory steady-state responses (ASSRs). The ASSR was measured using two new techniques: (i) adaptive stimulus patterns (ii) narrow-band chirp stimuli. 16 adults were obtained simultaneously at both ears 500, 1000, 2000, 4000?Hz, a built up four one-octave-wide chirps with repetition rate 40?Hz. A statistical test frequency domain used to detect response....

Recent auditory brain stem response measurements in tinnitus subjects with normal audiograms indicate the presence of hidden hearing loss that manifests as reduced neural output from cochlea at high sound intensities, and results mice suggest a link to deafferentation nerve fibers. As would lead deficits performance, present study investigates whether patients thresholds show impairment intensity discrimination compared an audiometrically matched control group. Intensity were significantly...

The loudness of as ound depends, among other parameters, on its temporal shape.Different models were proposed to account for aspects in perception.To investigate different dynamic concepts modeling loudness, predictions made with the twocurrent Glasbergand Moore [J.Acoust.Soc.Am. 50,331-341 (2002)] and Chalupper Fastl [Acta Acustica united 88,378-386 aset time-varying sounds.The predicted effects duration, repetition rate, amplitude-modulation, asymmetry,frequencymodulation systematic...

Real-world sounds like speech or traffic noise typically exhibit spectro-temporal variability because the energy in different spectral regions evolves differently as a sound unfolds time. However, it is currently not well understood how and temporal portions contributes to loudness. This study investigated listeners weight components of when judging its overall Spectral weights were measured for combination three loudness-matched narrowband noises with center frequencies. To measure weights,...

The detection of a signal in noise is enhanced when the masking coherently modulated over wide range frequencies. This phenomenon, known as comodulation release (CMR), has been attributed to across-channel processing; however, relative contribution different stages auditory system such processing unknown. It hypothesized that wideband or lateral inhibition may underlie physiological correlate CMR. To further test this hypothesis, we have measured responses single units from dorsal cochlear...

Data are presented on the relation between loudness measured in categorical units (CUs) using a standardized scaling method (ISO 16832, 2006) and expressed as classical measures phon sone. Based of narrowband noise signals by 31 normal-hearing subjects, sound pressure levels eliciting same were derived for various center frequencies. The results comparable to equal-loudness level contours. A comparison function CUs at 1000 Hz sones indicates cubic two measures.

Loudness was measured as a function of signal bandwidth for 10-, 100-, and 1000-ms-long signals. The test reference signals were bandpass-filtered noise spectrally centered at 2 kHz. the varied from 200 to 6400 Hz. had 3200 levels 45, 55, 65 dB SPL. level produce equal loudness with an adaptive, two-interval, two-alternative forced-choice procedure. A matching procedure used, where tracks all pairs be compared interleaved. Mean results nine normal-hearing subjects showed that magnitude...

Recent physiological studies suggest that comodulation masking release (CMR) could be a consequence of wideband inhibition at the level cochlear nucleus. The present study investigates whether existence region psychophysical CMR is comparable to inhibitory areas units showing correlate CMR. Since are similar suppressive regions basilar membrane, amount can accounted for by suppression was determined predicting data with model incorporating peripheral nonlinearity. A up 6dB still...

The equal-loudness-ratio hypothesis (ELRH) assumes that the loudness ratio between equal-level long and short signals with same spectrum is independent of level spectrum. Thus, it predicts amount spectral summation for signals. To investigate how duration affect summation, functions 10- 1000-ms bandpass-filtered noise centered at 2kHz were obtained normal-hearing listeners using categorical scaling. bandwidth was varied from 200 to 6400Hz. From difference 3200-Hz-wide reference signal...

A three-dimensional lattice-Boltzmann model (LBM) for the simulation of Maxwell equations is presented. The inclusion media follows an extension a special limit described in literature which applicable to this LBM and does not harm stability simulations. focus present study lies on properties numerical accuracy comparison standard finite-difference time-domain (FDTD) method based Yee's method. Typical examples, often investigated context simulations, are considered. These include propagation...

The detectability of a sinusoidal signal embedded in masker at the frequency can be improved by simultaneously presenting additional maskers off-frequency regions if and on-frequency component have same temporal envelope. This effect is commonly referred to as comodulation masking release (CMR). Recently, it was hypothesized that peripheral nonlinear processes such suppression may play role CMR over several octaves when level higher than component. aim present study test this hypothesis...