Monaural and binaural subjective modulation transfer functions in simple reverberation

Publication: Research - peer-reviewArticle in proceedings – Annual report year: 2008

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The envelope of a signal is filtered by the transmission channel through which it passes. The amount of reduction for a given envelope, or modulation, frequency has been called the modulation transfer function (MTF) and can be derived from the impulse response of the transmission channel [Schroeder, M.R. (1981) Modulation transfer-functions: Definition and measurement, Acustica, 49, 179-182]. The envelope of a speech signal is critical for intelligibility, and the speech transmission index (STI) predicts the intelligibility of speech through a given transmission channel based on its MTF [Houtgast, T. and Steeneken, H.J.M. (1973) Modulation transfer-function in room acoustics as a predictor of speech intelligibility, Acustica, 28, 66-73]. In the present study, the results of intensity modulation detection experiments with broad-band noise carriers are reported in monaural and binaural conditions, with single reflections at different arrival times in the two ears and with a simulated room impulse response. The monaural data describe a subjective MTF, which is similar to the physical MTF. An interaural modulation phase difference can create an interaural intensity fluctuation, which can give a binaural advantage in detecting the intensity modulation. This binaural advantage could be used to enhance speech intelligibility over purely monaural listening.
Original languageEnglish
Title of host publicationAuditory Signal Processing in Hearing Impaired Listeners
EditorsTorsten Dau, Jörg Buchholz, James Harte, Thomas Ulrich Christiansen
PublisherCenter Tryk A/S
Publication date2008
ISBN (print)87-990013-1-4
StatePublished - 2008
Event1st International Symposium on Auditory and Audiological Research - Elsinore, Denmark


Conference1st International Symposium on Auditory and Audiological Research
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ID: 3305677