Generating partially correlated noise—A comparison of methods

Hartmann, William M.; Cho, Yun Jin

doi:10.1121/1.3596475

Cited by 14 publications

(15 citation statements)

References 34 publications

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“…Two independent white noise sources were added and subtracted with variable weighting factors to generate stimuli for the right and left ears with a given IC (Hartmann and Cho, 2011). The standard interval had a fixed IC of unity.…”

Section: Methodsmentioning

confidence: 99%

Auditory and Cognitive Factors Associated with Speech-in-Noise Complaints following Mild Traumatic Brain Injury

2017

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Background Auditory complaints following mild traumatic brain injury are common, but few studies have addressed the role of auditory temporal processing in speech recognition complaints. Purpose In this study, deficits understanding speech in a background of speech noise following MTBI were evaluated with the goal of comparing the relative contributions of auditory and non-auditory factors. Research Design A matched-groups design was used in which a group of listeners with a history of MTBI were compared to a group matched in age and pure-tone thresholds, as well as a control group of young listeners with normal hearing. Study Sample Thirty-three listeners participated in the study, including thirteen in the MTBI group (mean age 46.7 years), eleven in the Matched group (mean age 49 years), and nine in the YNH group (mean age 20.8 years). Data Collection and Analysis Speech-in-noise deficits were evaluated using subjective measures as well as monaural word (WIN) and sentence (QuickSIN) tasks, and a binaural spatial release task. Performance on these measures was compared to psychophysical tasks evaluating monaural and binaural temporal fine structure tasks and spectral resolution. Cognitive measures of attention, processing speed, and working memory were evaluated as a possible difference between MTBI and Matched groups contributing to speech-in-noise deficits. Results A high proportion of listeners in the MTBI group reported difficulty understanding speech in noise (84%) compared to the Matched group (9.1%), and listeners who reported difficulty were more likely to have abnormal results on objective measures of speech in noise. No significant group differences were found between the MTBI and Matched listeners on any of the measures reported, but the number of abnormal tests differed across groups. Regression analysis revealed that a combination of auditory and auditory processing factors contributed to monaural speech-in-noise scores, but the benefit of spatial separation was related to a combination of working memory and peripheral auditory factors across all listeners in the study. Conclusions The results of this study are consistent with previous findings that a subset of listeners with MTBI have objective auditory deficits. Speech-in-noise performance was related to a combination of auditory and non-auditory factors, confirming the important role of audiology in MTBI rehabilitation. Further research is needed to evaluate the prevalence and causal relationship of auditory deficits following MTBI.

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Section: Methodsmentioning

confidence: 99%

Auditory and Cognitive Factors Associated with Speech-in-Noise Complaints following Mild Traumatic Brain Injury

2017

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“…Note that, for a given q, the actual interaural correlation values varied because of the statistical fluctuations in the levels of the noise samples. This variability was described for the technique employed in this study by Hartmann and Cho (2011) (see "Asymmetric two-generator method"). In reference to the Hartmann and Cho (2011) study, the "weak equal power" assumption applies to the current study in that the left and right ear noise powers were matched in expected value as opposed to the sample powers being scaled relative to the other so that the powers would be matched exactly.…”

Section: Itd and Ild Thresholdsmentioning

confidence: 99%

Relating interaural difference sensitivities for several parameters measured in normal-hearing and hearing-impaired listeners

Spencer

Hawley

Colburn

2016

The Journal of the Acoustical Society of America

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Just-noticeable differences (JNDs) in interaural time delay (ITD), interaural level difference (ILD), and interaural cross-correlation (ICC) were measured with low-and high-frequency noise bands over multiple sessions for 10 normal-hearing (NH) and 11 hearing-impaired (HI) listeners. Individual subject thresholds tended to improve with training then stabilize. Measured JNDs varied over these experienced listeners, for both subject groups and all tasks. Group JNDs were seldom predictable from hearing level. Individual listeners' JNDs were highly correlated across frequency for each task and group, except for ICC in the HI listeners. Further, ITD JNDs almost always significantly correlated with ILD JNDs within a group. Finally, although the ICC JNDs always significantly correlated with the ITD or ILD JNDs for the NH listeners, they often did not for the HI listeners. These findings suggest that little information about binaural sensitivity is added for NH listeners with multiple ITD, ILD, and ICC measures. For HI listeners, however, while ITD and ILD measures are well correlated, information is added with ICC measures. In general, the results suggest that less information is added with JND measures for NH listeners (15 significant correlations) than for HI listeners (six significant correlations).

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“…(25) of the uncertainties added to adjacent elements. According to models of partially correlated noise, 30 S is hence defined as …”

Section: B Simulation Resultsmentioning

confidence: 99%

The effect of reverberation on personal audio devices

Simon-Galvez

Elliott

Cheer

2014

The Journal of the Acoustical Society of America

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Personal audio refers to the creation of a listening zone within which a person, or a group of people, hears a given sound program, without being annoyed by other sound programs being reproduced in the same space. Generally, these different sound zones are created by arrays of loudspeakers. Although these devices have the capacity to achieve different sound zones in an anechoic environment, they are ultimately used in normal rooms, which are reverberant environments. At high frequencies, reflections from the room surfaces create a diffuse pressure component which is uniform throughout the room volume and thus decreases the directional characteristics of the device. This paper shows how the reverberant performance of an array can be modeled, knowing the anechoic performance of the radiator and the acoustic characteristics of the room. A formulation is presented whose results are compared to practical measurements in reverberant environments. Due to reflections from the room surfaces, pressure variations are introduced in the transfer responses of the array. This aspect is assessed by means of simulations where random noise is added to create uncertainties, and by performing measurements in a real environment. These results show how the robustness of an array is increased when it is designed for use in a reverberant environment.

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Generating partially correlated noise—A comparison of methods

Cited by 14 publications

References 34 publications

Auditory and Cognitive Factors Associated with Speech-in-Noise Complaints following Mild Traumatic Brain Injury

Auditory and Cognitive Factors Associated with Speech-in-Noise Complaints following Mild Traumatic Brain Injury

Relating interaural difference sensitivities for several parameters measured in normal-hearing and hearing-impaired listeners

The effect of reverberation on personal audio devices

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