Prediction of binaural speech intelligibility with frequency-dependent interaural phase differences

2009 ◽  
Vol 126 (3) ◽  
pp. 1359-1368 ◽  
Author(s):  
Rainer Beutelmann ◽  
Thomas Brand ◽  
Birger Kollmeier
Keyword(s):  
Speech Intelligibility ◽  
Frequency Dependent ◽  
Interaural Phase ◽  
Phase Differences

scholarly journals Measurement and Prediction of Binaural-Temporal Integration of Speech Reflections

2019 ◽  
Vol 23 ◽  
pp. 233121651985426
Author(s):  
Jan Rennies ◽  
Anna Warzybok ◽  
Thomas Brand ◽  
Birger Kollmeier
Keyword(s):  
Speech Recognition ◽  
Speech Intelligibility ◽  
Temporal Integration ◽  
Variable Number ◽  
Interaural Phase ◽  
Speech Intelligibility Model ◽  
Speech Information ◽  
Early Late ◽  
Late Part ◽  
Phase Differences

For speech intelligibility in rooms, the temporal integration of speech reflections is typically modeled by separating the room impulse response (RIR) into an early (assumed beneficial for speech intelligibility) and a late part (assumed detrimental). This concept was challenged in this study by employing binaural RIRs with systematically varied interaural phase differences (IPDs) and amplitude of the direct sound and a variable number of reflections delayed by up to 200 ms. Speech recognition thresholds in stationary noise were measured in normal-hearing listeners for 86 conditions. The data showed that direct sound and one or several early speech reflections could be perfectly integrated when they had the same IPD. Early reflections with the same IPD as the noise (but not as the direct sound) could not be perfectly integrated with the direct sound. All conditions in which the dominant speech information was within the early RIR components could be well predicted by a binaural speech intelligibility model using classic early/late separation. In contrast, when amplitude or IPD favored late RIR components, listeners appeared to be capable of focusing on these components rather than on the precedent direct sound. This could not be modeled by an early/late separation window but required a temporal integration window that can be flexibly shifted along the RIR.

Physiological detection of interaural phase differences

2007 ◽  
Vol 121 (2) ◽  
pp. 1017-1027 ◽  
Author(s):  
Bernhard Ross ◽  
Kelly L. Tremblay ◽  
Terence W. Picton
Keyword(s):  
Interaural Phase ◽  
Phase Differences

Interaural Phase Disparity of Stutterers and Nonstutterers

1972 ◽  
Vol 15 (4) ◽  
pp. 771-780 ◽  
Author(s):  
Courtney Stromsta
Keyword(s):  
Control System ◽  
Phase Shift ◽  
Phase Difference ◽  
Auditory Feedback ◽  
Laryngeal Function ◽  
Interaural Phase ◽  
Frequency Criterion ◽  
Interaural Phase Difference ◽  
The Mean ◽  
Phase Differences

Stutterers and nonstutterers cancelled the auditory sensation evoked by bone-conducted sinusoidal signals. They accomplished this by appropriate phase and amplitude adjustments of simultaneously presented bilateral air-conducted signals of the same frequency. Criterion measures of interaural phase difference at the point of cancellation were obtained for seven frequencies. The mean interaural phase differences obtained by stutterers were consistently greater than those of the nonstutterers. Based on time-equivalent values of the mean interaural phase differences, the values for stutterers were approximately twice as great as for nonstutterers at 150, 300, and 1200 Hz. The mean interaural phase difference found to exist for stutterers at 150 Hz approximates the magnitude of phase shift of normally delayed air-conducted auditory feedback of speech sounds that serves to induce experimental blockage of phonation. This relationship, in view of other findings, offers credence to the idea that disturbance of laryngeal function effected by an anomalous audition-phonation control system could be a causative agent in stuttering.

Frequency-dependent interaural delays in the medial superior olive: implications for interaural cochlear delays

2011 ◽  
Vol 106 (4) ◽  
pp. 1985-1999 ◽  
Author(s):  
Mitchell L. Day ◽  
Malcolm N. Semple
Keyword(s):  
Interaural Time Difference ◽  
Superior Olivary Complex ◽  
Medial Superior Olive ◽  
Biophysical Parameters ◽  
Tone Frequency ◽  
Frequency Dependent ◽  
Superior Olive ◽  
Interaural Phase ◽  
Cochlear Delays ◽  
Delay Component

Neurons in the medial superior olive (MSO) are tuned to the interaural time difference (ITD) of sound arriving at the two ears. MSO neurons evoke a strongest response at their best delay (BD), at which the internal delay between bilateral inputs to MSO matches the external ITD. We performed extracellular recordings in the superior olivary complex of the anesthetized gerbil and found a majority of single units localized to the MSO to exhibit BDs that shifted with tone frequency. The relation of best interaural phase difference to tone frequency revealed nonlinearities in some MSO units and others with linear relations with characteristic phase between 0.4 and 0.6 cycles. The latter is usually associated with the interaction of ipsilateral excitation and contralateral inhibition, as in the lateral superior olive, yet all MSO units exhibited evidence of bilateral excitation. Interaural cochlear delays and phase-locked contralateral inhibition are two mechanisms of internal delay that have been suggested to create frequency-dependent delays. Best interaural phase-frequency relations were compared with a cross-correlation model of MSO that incorporated interaural cochlear delays and an additional frequency-independent delay component. The model with interaural cochlear delay fit phase-frequency relations exhibiting frequency-dependent delays with precision. Another model of MSO incorporating inhibition based on realistic biophysical parameters could not reproduce observed frequency-dependent delays.

scholarly journals Perception of Interaural Phase Differences With Envelope and Fine Structure Coding Strategies in Bilateral Cochlear Implant Users

2016 ◽  
Vol 20 ◽  
pp. 233121651666560 ◽  
Author(s):  
Stefan Zirn ◽  
Susan Arndt ◽  
Antje Aschendorff ◽  
Roland Laszig ◽  
Thomas Wesarg
Keyword(s):  
Fine Structure ◽  
Cochlear Implant ◽  
Interaural Phase ◽  
Coding Strategies ◽  
Bilateral Cochlear Implant ◽  
Phase Differences
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