In practice, a microphone is calibrated in a closed coupler, wherein sound pressure is distributed uniformly over the diaphragm. Nonetheless, in that case, the problem of sound reflection remains indispensable. A technique that overcomes this limitation and augments the coupler calibration method is offered. Also, the frequency response data provided by the manufacturer is always A-weighted. The A and C-weighted frequency response characteristics of a variety of microphones is studied using the testing and calibration suite, in the direct field of the source, which overcomes the problem of sound reflection. The frequency response in the 100 Hz to 16 kHz frequency range has been examined at constant SPL of 82 dB. The implementation and reliability of the technique is evaluated by examining the expanded uncertainties involved therein. Furthermore, the A-weighted and C-weighted constant pressure frequency response in case of each microphone is compared. A detailed description of the procedure is presented, along with assessments, wherein the reliability of the results is evaluated over Type-A and Type-B uncertainties.
{"title":"Constant Pressure dB(A) and dB(C) frequency response of microphones and the expanded uncertainties involved therein","authors":"F. Surve, Aruna Godase","doi":"10.1121/2.0001455","DOIUrl":"https://doi.org/10.1121/2.0001455","url":null,"abstract":"In practice, a microphone is calibrated in a closed coupler, wherein sound pressure is distributed uniformly over the diaphragm. Nonetheless, in that case, the problem of sound reflection remains indispensable. A technique that overcomes this limitation and augments the coupler calibration method is offered. Also, the frequency response data provided by the manufacturer is always A-weighted. The A and C-weighted frequency response characteristics of a variety of microphones is studied using the testing and calibration suite, in the direct field of the source, which overcomes the problem of sound reflection. The frequency response in the 100 Hz to 16 kHz frequency range has been examined at constant SPL of 82 dB. The implementation and reliability of the technique is evaluated by examining the expanded uncertainties involved therein. Furthermore, the A-weighted and C-weighted constant pressure frequency response in case of each microphone is compared. A detailed description of the procedure is presented, along with assessments, wherein the reliability of the results is evaluated over Type-A and Type-B uncertainties.","PeriodicalId":300779,"journal":{"name":"180th Meeting of the Acoustical Society of America","volume":"527 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124497591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Gvozdeva, E. Klishova, V. Sitdikov, L. Golovanova, I. Andreeva
Minimal time (MT) to determine direction of the broadband (0.2-8 kHz) sound source motion was measured in 12 patients with symmetrical moderately severe sensorineural hearing loss (SNHL) and 11 normally hearing listeners. For the aim we used an adaptive psychoacoustic procedure and a free field model of azimuthally moving sound sources based on the precedence effect. Patients showed high between-individual variability of MT (200-1500 ms) despite the fact that they had equal hearing loss degree. Median value of MT in SNHL patients was tenfold higher than in subjects with normal hearing: 1000 and 100 ms, respectively. The results indicate that impaired hearing sensitivity per se is not the main factor influencing perception of azimuthal motion in SNHL patients. Possible reasons of the revealed temporal deficit are loss of compressive nonlinearity of the basilar membrane, effects of age and SNHL duration. The latter can also lead to central auditory processing disorders and subsequent worsening of temporal analysis.
{"title":"Minimal time to determine direction of azimuthally moving sounds in moderately severe sensorineural hearing loss","authors":"A. Gvozdeva, E. Klishova, V. Sitdikov, L. Golovanova, I. Andreeva","doi":"10.1121/2.0001451","DOIUrl":"https://doi.org/10.1121/2.0001451","url":null,"abstract":"Minimal time (MT) to determine direction of the broadband (0.2-8 kHz) sound source motion was measured in 12 patients with symmetrical moderately severe sensorineural hearing loss (SNHL) and 11 normally hearing listeners. For the aim we used an adaptive psychoacoustic procedure and a free field model of azimuthally moving sound sources based on the precedence effect. Patients showed high between-individual variability of MT (200-1500 ms) despite the fact that they had equal hearing loss degree. Median value of MT in SNHL patients was tenfold higher than in subjects with normal hearing: 1000 and 100 ms, respectively. The results indicate that impaired hearing sensitivity per se is not the main factor influencing perception of azimuthal motion in SNHL patients. Possible reasons of the revealed temporal deficit are loss of compressive nonlinearity of the basilar membrane, effects of age and SNHL duration. The latter can also lead to central auditory processing disorders and subsequent worsening of temporal analysis.","PeriodicalId":300779,"journal":{"name":"180th Meeting of the Acoustical Society of America","volume":"364 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122147993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
NASA’s X-59 Quiet Supersonic Technology aircraft will soon be used to collect data to support the development of a dose-response relationship between low-boom level and human perception. The X-59’s low-boom level will depend on aircraft conditions and trajectory, which can be controlled, and on atmospheric conditions, which cannot be controlled. To assess variability in low-boom levels produced by realistic atmospheres, NASA’s PCBoom code was used to simulate propagation of an X-59 nearfield pressure condition through atmospheric profiles measured during NASA’s Quiet Supersonic Flights 2018 (QSF18) test. Despite QSF18 lasting only 11 days, substantial weather variability occurred including snow and record high temperatures. A PL range of about 8.5 dB was predicted due to the QSF18 atmospheric variability. These results demonstrate the necessity for X-59’s flight condition to be adjusted based on atmospheric conditions in order to achieve desired loudness levels during community surveys. Undertrack booms’ Perceived Levels (PL) were predicted not to exceed 75 dB, X-59’s target level in a standard atmosphere. Attenuation rate, ray tube area, path length and other quantities are presented throughout propagation for the atmospheres that produce the loudest and quietest booms. Humidity differences below 15kft were a primary driver of the PL differences.
{"title":"Simulations and case study of X-59 low-booms propagated through measured atmospheric profiles","authors":"W. Doebler","doi":"10.1121/2.0001448","DOIUrl":"https://doi.org/10.1121/2.0001448","url":null,"abstract":"NASA’s X-59 Quiet Supersonic Technology aircraft will soon be used to collect data to support the development of a dose-response relationship between low-boom level and human perception. The X-59’s low-boom level will depend on aircraft conditions and trajectory, which can be controlled, and on atmospheric conditions, which cannot be controlled. To assess variability in low-boom levels produced by realistic atmospheres, NASA’s PCBoom code was used to simulate propagation of an X-59 nearfield pressure condition through atmospheric profiles measured during NASA’s Quiet Supersonic Flights 2018 (QSF18) test. Despite QSF18 lasting only 11 days, substantial weather variability occurred including snow and record high temperatures. A PL range of about 8.5 dB was predicted due to the QSF18 atmospheric variability. These results demonstrate the necessity for X-59’s flight condition to be adjusted based on atmospheric conditions in order to achieve desired loudness levels during community surveys. Undertrack booms’ Perceived Levels (PL) were predicted not to exceed 75 dB, X-59’s target level in a standard atmosphere. Attenuation rate, ray tube area, path length and other quantities are presented throughout propagation for the atmospheres that produce the loudest and quietest booms. Humidity differences below 15kft were a primary driver of the PL differences.","PeriodicalId":300779,"journal":{"name":"180th Meeting of the Acoustical Society of America","volume":"181 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125823053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In room acoustic scenarios, listeners’ localization is often dominated by the sound propagating directly from the its source despite numerous reflections that present different spatial cues only milliseconds later. This is called the precedence effect (PE). Most studies have simulated the PE by presenting one sound (the lead) followed by a copy of the lead that is delayed and presented with different interaural cues (the lag). These simulations assume that reflective surfaces are flat, yet interior surfaces are often far more complex and variable, resulting in spatially and temporally diffuse reflections. The effect of the temporal aspect of this diffusion on listeners’ localization of lead/lag, 200-ms duration, noise stimuli filtered to 100-900 Hz and presented over headphones is investigated. Lag stimuli are convolved with a Hanning-windowed 2-ms noise burst to simulate temporal effects of uneven reflective surfaces. Results show that listeners’ localization is dominated by the interaural cues of the lead, even when gating onsets/offsets are windowed out. Modeling analyses based on those in Pastore and Braasch 2019 suggest that interaural time differences in the ongoing stimulus portion can be extracted from rising slopes of the envelopes of neural output, even when lead and lag envelopes are decorrelated.
{"title":"The effect of temporal diffusion on the ongoing precedence effect","authors":"M. T. Pastore, J. Braasch","doi":"10.1121/2.0001445","DOIUrl":"https://doi.org/10.1121/2.0001445","url":null,"abstract":"In room acoustic scenarios, listeners’ localization is often dominated by the sound propagating directly from the its source despite numerous reflections that present different spatial cues only milliseconds later. This is called the precedence effect (PE). Most studies have simulated the PE by presenting one sound (the lead) followed by a copy of the lead that is delayed and presented with different interaural cues (the lag). These simulations assume that reflective surfaces are flat, yet interior surfaces are often far more complex and variable, resulting in spatially and temporally diffuse reflections. The effect of the temporal aspect of this diffusion on listeners’ localization of lead/lag, 200-ms duration, noise stimuli filtered to 100-900 Hz and presented over headphones is investigated. Lag stimuli are convolved with a Hanning-windowed 2-ms noise burst to simulate temporal effects of uneven reflective surfaces. Results show that listeners’ localization is dominated by the interaural cues of the lead, even when gating onsets/offsets are windowed out. Modeling analyses based on those in Pastore and Braasch 2019 suggest that interaural time differences in the ongoing stimulus portion can be extracted from rising slopes of the envelopes of neural output, even when lead and lag envelopes are decorrelated.","PeriodicalId":300779,"journal":{"name":"180th Meeting of the Acoustical Society of America","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126052913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The COVID-19 pandemic forced my teaching and all interactions with my students to be conducted entirely online via Zoom from March 2020 through May 2021. Reflecting on this experience, I have been surprised to realize that there are several aspects of teaching online over Zoom which I will miss when I return to the classroom. In this paper I describe my teach-from-home studio which enabled me to maximize online interaction with my students, and how I was able to bring some much-needed humor into my online classes using Zoom virtual backgrounds and costumes and later a small art mannequin placed and a dedicated webcam. In addition, I discuss some ways I was able to encourage students to interact with each other and with me. A surprising observation was an increased level of engagement between myself and my online students, especially the distance education students with whom I normally have little interaction. There were also some things that did not work over Zoom, such as the elaborate classroom demonstrations which I normally use on a regular basis. This paper concludes with lessons learned along with things I hope to retain and/or change when I return to teaching in-person in a classroom.
{"title":"Positive aspects of teaching online during COVID-19: Zoom backgrounds, MannyCam, and increased student engagement","authors":"Daniel A. Russell","doi":"10.1121/2.0001446","DOIUrl":"https://doi.org/10.1121/2.0001446","url":null,"abstract":"The COVID-19 pandemic forced my teaching and all interactions with my students to be conducted entirely online via Zoom from March 2020 through May 2021. Reflecting on this experience, I have been surprised to realize that there are several aspects of teaching online over Zoom which I will miss when I return to the classroom. In this paper I describe my teach-from-home studio which enabled me to maximize online interaction with my students, and how I was able to bring some much-needed humor into my online classes using Zoom virtual backgrounds and costumes and later a small art mannequin placed and a dedicated webcam. In addition, I discuss some ways I was able to encourage students to interact with each other and with me. A surprising observation was an increased level of engagement between myself and my online students, especially the distance education students with whom I normally have little interaction. There were also some things that did not work over Zoom, such as the elaborate classroom demonstrations which I normally use on a regular basis. This paper concludes with lessons learned along with things I hope to retain and/or change when I return to teaching in-person in a classroom.","PeriodicalId":300779,"journal":{"name":"180th Meeting of the Acoustical Society of America","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129112645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The bundengan, a folk zither instrument from Indonesia, has a unique timbre because its strings are added with small bamboo clips. The non-homogeneous mass distributions allow the strings to imitate the sound of metal percussions in the gamelan ensemble. Moreover, the clever design of the bamboo clips allow the bundengan timbre to be controlled easily by sliding the clips along the strings. Using computer simulations, we have systematically varied both the position and the mass of the bamboo clips, resulting in a rich catalogue of vibration spectra. In these spectra, we have observed peculiar patterns in the graphs of vibration-frequency -vs- clip-position. These patterns, which occur across different vibration modes, evolve as the mass of the bamboo clips are increased. In the extreme case where the bamboo clips are very heavy, these patterns can be explained by a modified version of the Mersenne’s Law.
{"title":"A modified Mersenne Law governs the inter-mode patterns in bundengan string vibrations","authors":"G. Parikesit","doi":"10.1121/2.0001440","DOIUrl":"https://doi.org/10.1121/2.0001440","url":null,"abstract":"The bundengan, a folk zither instrument from Indonesia, has a unique timbre because its strings are added with small bamboo clips. The non-homogeneous mass distributions allow the strings to imitate the sound of metal percussions in the gamelan ensemble. Moreover, the clever design of the bamboo clips allow the bundengan timbre to be controlled easily by sliding the clips along the strings. Using computer simulations, we have systematically varied both the position and the mass of the bamboo clips, resulting in a rich catalogue of vibration spectra. In these spectra, we have observed peculiar patterns in the graphs of vibration-frequency -vs- clip-position. These patterns, which occur across different vibration modes, evolve as the mass of the bamboo clips are increased. In the extreme case where the bamboo clips are very heavy, these patterns can be explained by a modified version of the Mersenne’s Law.","PeriodicalId":300779,"journal":{"name":"180th Meeting of the Acoustical Society of America","volume":"234 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123297360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Natural gut harp strings are notoriously sensitive to changes in humidity, but the nature of this sensitivity is poorly understood. The results of some recent measurements are presented, in which a number of well-settled strings were held at constant temperature and subjected to changes in humidity. The results show multiple periods when, after raising the humidity, the strings appeared to undergo additional periods of creep. When the strings were not creeping, there appeared to be some form of coupling between humidity-induced changes in the string linear density and its tension. Moreover, the effects of these changes in linear density and tension largely cancelled out, with little net effect on the string frequency. The results presented here seem to indicate that the useful life of a gut harp string may be determined as much by its propensity to creep as by its inherent yield strength.
{"title":"The effects of humidity changes on natural gut harp strings","authors":"Nicolas J. Lynch-Aird, J. Woodhouse","doi":"10.1121/2.0001441","DOIUrl":"https://doi.org/10.1121/2.0001441","url":null,"abstract":"Natural gut harp strings are notoriously sensitive to changes in humidity, but the nature of this sensitivity is poorly understood. The results of some recent measurements are presented, in which a number of well-settled strings were held at constant temperature and subjected to changes in humidity. The results show multiple periods when, after raising the humidity, the strings appeared to undergo additional periods of creep. When the strings were not creeping, there appeared to be some form of coupling between humidity-induced changes in the string linear density and its tension. Moreover, the effects of these changes in linear density and tension largely cancelled out, with little net effect on the string frequency. The results presented here seem to indicate that the useful life of a gut harp string may be determined as much by its propensity to creep as by its inherent yield strength.","PeriodicalId":300779,"journal":{"name":"180th Meeting of the Acoustical Society of America","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114898851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
That occupational noise exposure causes hearing loss has long been known, but non-occupational noise exposure was not recognized as a problem until the 1960s. Today, most Americans are regularly exposed to non-occupational noise sufficient to cause hearing loss, perhaps because of an erroneous belief that 85-decibel noise exposure, based on occupational standards, is safe for the public without time limit. Common noise sources include personal audio systems, especially among young people; public transit; social, sports, and entertainment venues; household appliances; and power tools and landscape maintenance equipment. As a result, approximately 25% of American adults age 20-69 have noise-induced hearing loss, 53% without significant occupational exposure. Why? The Equal Energy Hypothesis states that equal amounts of sound energy produce equal amounts of hearing loss, regardless of how that sound is distributed over time. The response to sound is non-linear, though, and brief high-level exposures may have disproportionate impacts on hearing. How loud is too loud? The Auditory Injury Threshold is only 75-78 A-weighted decibels. The Environmental Protection Agency calculated a time-weighted daily average of 70 decibels to prevent hearing loss, but the true safe noise level may be 60 decibels or lower. Recommendations are made to reduce public noise exposure.
{"title":"Too loud! Non-occupational noise exposure causes hearing loss","authors":"Daniel Fink, Jan L. Mayes","doi":"10.1121/2.0001436","DOIUrl":"https://doi.org/10.1121/2.0001436","url":null,"abstract":"That occupational noise exposure causes hearing loss has long been known, but non-occupational noise exposure was not recognized as a problem until the 1960s. Today, most Americans are regularly exposed to non-occupational noise sufficient to cause hearing loss, perhaps because of an erroneous belief that 85-decibel noise exposure, based on occupational standards, is safe for the public without time limit. Common noise sources include personal audio systems, especially among young people; public transit; social, sports, and entertainment venues; household appliances; and power tools and landscape maintenance equipment. As a result, approximately 25% of American adults age 20-69 have noise-induced hearing loss, 53% without significant occupational exposure. Why? The Equal Energy Hypothesis states that equal amounts of sound energy produce equal amounts of hearing loss, regardless of how that sound is distributed over time. The response to sound is non-linear, though, and brief high-level exposures may have disproportionate impacts on hearing. How loud is too loud? The Auditory Injury Threshold is only 75-78 A-weighted decibels. The Environmental Protection Agency calculated a time-weighted daily average of 70 decibels to prevent hearing loss, but the true safe noise level may be 60 decibels or lower. Recommendations are made to reduce public noise exposure.","PeriodicalId":300779,"journal":{"name":"180th Meeting of the Acoustical Society of America","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114200772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Micro-Perforated Panels constitute an alternative to classical porous materials in demanding environments due to fire-proofness, cleanability and lightweight properties. However, its performance is greatly determined by a proper selection of the constitutive physical factors. To find the optimal set of parameters, a combinatorial optimization problem has to be solved using a cost function that classically includes the absorption coefficient averaged over a frequency band. Recently, another criterion has been considered by the use of a causal integral that relates the thickness of the partition to the amount of absorption that can be achieved over a desired bandwidth. This provides a set of states that present critically-coupled resonant behavior and perfect absorption at the requested frequency while maximizing the total absorption. When considering sub-millimetric panel thickness or membranes, the effect of the panel vibrations has to be taken into account. In this study, we have extended the causality criterion to consider the effect of the panel vibration of the perforations impedance. Another model has also been examined to account for the cavities Helmholtz-type resonance and their influence on the corresponding critically-coupled states.
{"title":"Vibrational effects on the optimization of micro-perforated partitions based on a causality criterion","authors":"T. Bravo, C. Maury","doi":"10.1121/2.0001435","DOIUrl":"https://doi.org/10.1121/2.0001435","url":null,"abstract":"Micro-Perforated Panels constitute an alternative to classical porous materials in demanding environments due to fire-proofness, cleanability and lightweight properties. However, its performance is greatly determined by a proper selection of the constitutive physical factors. To find the optimal set of parameters, a combinatorial optimization problem has to be solved using a cost function that classically includes the absorption coefficient averaged over a frequency band. Recently, another criterion has been considered by the use of a causal integral that relates the thickness of the partition to the amount of absorption that can be achieved over a desired bandwidth. This provides a set of states that present critically-coupled resonant behavior and perfect absorption at the requested frequency while maximizing the total absorption. When considering sub-millimetric panel thickness or membranes, the effect of the panel vibrations has to be taken into account. In this study, we have extended the causality criterion to consider the effect of the panel vibration of the perforations impedance. Another model has also been examined to account for the cavities Helmholtz-type resonance and their influence on the corresponding critically-coupled states.","PeriodicalId":300779,"journal":{"name":"180th Meeting of the Acoustical Society of America","volume":"52 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114087609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Two paradigms have been compared, which were aimed to investigate an effect of an additional signal pattern on ripple density thresholds. The discrimination between an extreme ripple density reference and rippled test pattern and the discrimination between a rippled reference and rippled test stimuli were measured. Stimuli contained or did not contain an additional signal pattern. The additional signal had the same length, bandwidth, and level as the signal. A ripple density of the additional signal was varied from 0 to 7 ripples/oct. For the stimuli with an additional rippled signal and non-rippled reference signal, the mean resolution was 11 ripples/oct with 16,47 ripples/oct for a non-rippled additional signal, and 52.4 ripples/oct with no additional signal. For a rippled additional signal, the mean resolution was 8.86 with the additional signal ripples/oct and 8.5 ripples/oct with no additional signal. For non-rippled reference signals results could be explained by the temporal mechanism when spectral pattern of the stimulus was unresolvable. For rippled reference signals, the data can be explained by similar cochlear excitation patterns.
{"title":"Ripple density resolution of complex signals with additional rippled patterns","authors":"M. Tomozova, A. Supin, D. Nechaev, O. Milekhina","doi":"10.1121/2.0001432","DOIUrl":"https://doi.org/10.1121/2.0001432","url":null,"abstract":"Two paradigms have been compared, which were aimed to investigate an effect of an additional signal pattern on ripple density thresholds. The discrimination between an extreme ripple density reference and rippled test pattern and the discrimination between a rippled reference and rippled test stimuli were measured. Stimuli contained or did not contain an additional signal pattern. The additional signal had the same length, bandwidth, and level as the signal. A ripple density of the additional signal was varied from 0 to 7 ripples/oct. For the stimuli with an additional rippled signal and non-rippled reference signal, the mean resolution was 11 ripples/oct with 16,47 ripples/oct for a non-rippled additional signal, and 52.4 ripples/oct with no additional signal. For a rippled additional signal, the mean resolution was 8.86 with the additional signal ripples/oct and 8.5 ripples/oct with no additional signal. For non-rippled reference signals results could be explained by the temporal mechanism when spectral pattern of the stimulus was unresolvable. For rippled reference signals, the data can be explained by similar cochlear excitation patterns.","PeriodicalId":300779,"journal":{"name":"180th Meeting of the Acoustical Society of America","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129020878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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