Amplitude modulation detection by human listeners in sound fields

Pavel Zahorik, Duck O. Kim, Shigeyuki Kuwada, Paul W. Anderson, Eugene Brandewie, Nirmal Srinivasan

Research output: Contribution to journalConference articlepeer-review

9 Scopus citations

Abstract

The temporal modulation transfer function (TMTF) approach allows techniques from linear systems analysis to be used to predict how the auditory system will respond to arbitrary patterns of amplitude modulation (AM). Although this approach forms the basis for a standard method of predicting speech intelligibility based on estimates of the acoustical modulation transfer function (MTF) between source and receiver, human sensitivity to AM as characterized by the TMTF has not been extensively studied under realistic listening conditions, such as in reverberant sound fields. Here, TMTFs (octave bands from 2-512 Hz) were obtained in 3 listening conditions simulated using virtual auditory space techniques: diotic, anechoic sound field, reverberant room sound field. TMTFs were then related to acoustical MTFs estimated using two different methods in each of the listening conditions. Both diotic and anechoic data were found to be in good agreement with classic results, but AM thresholds in the reverberant room were lower than predictions based on acoustical MTFs. This result suggests that simple linear systems techniques may not be appropriate for predicting TMTFs from acoustical MTFs in reverberant sound fields, and may be suggestive of mechanisms that functionally enhance modulation during reverberant listening.

Original languageEnglish (US)
Article number050005
JournalProceedings of Meetings on Acoustics
Volume12
DOIs
StatePublished - Dec 1 2011
Event161st Meeting Acoustical Society of America 2011 - Seattle, WA, United States
Duration: May 23 2011May 27 2011

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