The effect of interaural differences in envelope shape on the perceived location of sounds (L)

Francart, Tom; Lenssen, Anneke; Wouters, Jan

doi:10.1121/1.4733557

Cited by 6 publications

(5 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is therefore suggested that a perceptually relevant threshold level is in the order of À30 to À10 dB re peak, and not, as in previous studies, at À50 dB or lower. The proposed range is in line with the critical modulation depth (Stellmack et al, 2005) mentioned in the introduction and also with results from Francart et al (2012), suggesting that the binaural system puts more weight on higher level portions of the attack flank than on lower level portions.…”

Section: Discussionsupporting

confidence: 78%

Comparing the effect of pause duration on threshold interaural time differences between exponential and squared-sine envelopes (L)

Dietz

Wendt

Ewert

et al. 2013

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

Recently two studies [Klein-Hennig et al., J. Acoust. Soc. Am. 129, 3856-3872 (2011); Laback et al., J. Acoust. Soc. Am. 130, 1515-1529] independently investigated the isolated effect of pause duration on sensitivity to interaural time differences (ITD) in the ongoing stimulus envelope. The steepness of the threshold ITD as a function of pause duration functions differed considerably across studies. The present study, using matched carrier and modulation frequencies, directly compared threshold ITDs for the two envelope flank shapes from those studies. The results agree well when defining the metric of pause duration based on modulation depth sensitivity.

show abstract

Section: Discussionsupporting

confidence: 78%

Comparing the effect of pause duration on threshold interaural time differences between exponential and squared-sine envelopes (L)

Dietz

Wendt

Ewert

et al. 2013

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

show abstract

“…Recent studies indicate that the main factors determining envelope ITD sensitivity are temporal properties of the envelope, such as the steepness of the onsets and the duty cycle Trahiotis 2009, 2010;Ewert et al 2009;Francart et al 2012;Laback et al 2011). Generally, ITD sensitivity improves with increasing onset steepness and increasing dead time, which is the time the envelope remains at the minimum level in every period.…”

Section: Introductionmentioning

confidence: 99%

Modulation Enhancement in the Electrical Signal Improves Perception of Interaural Time Differences with Bimodal Stimulation

Francart

Lenssen

Wouters

2014

JARO

Self Cite

View full text Add to dashboard Cite

Interaural timing cues are important for sound source localization and for binaural unmasking of speech that is spatially separated from interfering sounds. Users of a cochlear implant (CI) with residual hearing in the non-implanted ear (bimodal listeners) can only make very limited use of interaural timing cues with their clinical devices. Previous studies showed that bimodal listeners can be sensitive to interaural time differences (ITDs) for simple single-and three-channel stimuli. The modulation enhancement strategy (MEnS) was developed to improve the ITD perception of bimodal listeners. It enhances temporal modulations on all stimulated electrodes, synchronously with modulations in the acoustic signal presented to the non-implanted ear, based on measurement of the amplitude peaks occurring at the rate of the fundamental frequency in voiced phonemes. In the first experiment, ITD detection thresholds were measured using the method of constant stimuli for five bimodal listeners for an artificial vowel, processed with either the advanced combination encoder (ACE) strategy or with MEnS. With MEnS, detection thresholds were significantly lower, and for four subjects well within the physically relevant range. In the second experiment, the extent of lateralization was measured in three subjects with both strategies, and ITD sensitivity was determined using an adaptive procedure. All subjects could lateralize sounds based on ITD and sensitivity was significantly better with MEnS than with ACE. The current results indicate that ITD cues can be provided to bimodal listeners with modified sound processing.

show abstract

“…Monaghan et al (2013) compared their results of the influence of attack time in similar stimuli to those reported in Chapter 2, finding them to be in line. Francart et al (2012) used the extended NCC model with adaptation loops, and were able to qualitatively account for their data. Recently, I developed and conducted a psychophysical experiment that measured the influence of selected envelope segments on the extent of laterality (Dietz et al, 2015).…”

Section: Chapter 5 General Conclusionmentioning

confidence: 99%

Art as behaviour – an ethological approach to visual and verbal art, music and architecture

Sütterlin¹,

Schiefenhövel²,

Lehmann³

et al. 2014

anthranz

View full text Add to dashboard Cite

The ability of the human auditory system to function under unfavorable acoustic conditions, for example focusing on a single talker in a multi-talker environment with background noise and reverberation, is well known (e.g., Cherry, 1953;Kaiser and David, 1960). The theory of auditory scene analysis (ASA, Bregman, 1994) states that the auditory system actively and passively groups several signal features into internal representations of sound sources. This separation helps in tasks like understanding speech in noise or tracking the movement of a sound source. Two of the important signal features are binaural cues derived from a joint processing of the signals received at both ears and pitch or harmonicity, as, e.g., generated by voiced speech sounds (Darwin and Carlyon, 1995). Binaural cues give information about the location and movement of a sound source, while harmonicity processing enables grouping of signal energy according to a fundamental frequency (F0), which helps for example in the separation of different voices. As the signals of interest in auditory scene analysis (voiced speech, animal calls, music) are often periodical (e.g., Fletcher, 1992), the aim of this thesis is to provide psychophysical data and develop and evaluate models for binaural and harmonic processing of periodic signals.The first part of this thesis deals with the processing of interaural time differences (ITDs) in signals with a periodic envelope. Here, a custom periodic envelope is constructed consisting of several segments. The influence of each envelope segment on the sensitivity to ITDs is measured in psychophysical experiments. The ability of an established model for ITD sensitivity (Bernstein and Trahiotis, 2002) to predict the data is evaluated and the model is extended by principles of neuronal adaptation to improve model performance. This is of particular interest as it offers valuable hints on the binaural processing of voiced speech sounds at high frequencies and possible coding strategies for binaural hearing aids or cochlear implants.The second and third part deal with combined processing of harmonicity and ITDs. The second part establishes the method of measuring detection thresholds in harmonicity research. In psychophysical experiments, the ability of subjects to detect a single target component embedded in a tone complex is tested, while the target tone is in harmonic or mis-3 tuned relationship to the masking tone complex. Based on this method, the third part of this thesis reports on combination experiments, where the target tone is additionally presented with an interaural phase difference (IPD). An auditory computer model based on amplitude modulation processing and equalization-cancellation (Durlach, 1963) is used to predict the psychophysical results. Various hypotheses on the combination of binaural and harmonicity information are tested against the human and model data. The results of both studies shed light on the combined processing of two important signal features in ASA and are of high relevanc...

show abstract

The effect of interaural differences in envelope shape on the perceived location of sounds (L)

Cited by 6 publications

References 15 publications

Comparing the effect of pause duration on threshold interaural time differences between exponential and squared-sine envelopes (L)

Comparing the effect of pause duration on threshold interaural time differences between exponential and squared-sine envelopes (L)

Modulation Enhancement in the Electrical Signal Improves Perception of Interaural Time Differences with Bimodal Stimulation

Art as behaviour – an ethological approach to visual and verbal art, music and architecture

Contact Info

Product

Resources

About