The role of across-frequency envelope processing for speech intelligibility

Alexandre Chabot-Leclerc, Søren Jørgensen, Torsten Dau

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

Speech intelligibility models consist of a preprocessing part that transforms the stimuli into some internal (auditory) representation, and a decision metric that quantifies effects of transmission channel, speech interferers, and auditory processing on the speech intelligibility. Here, two recent speech intelligibility models, the spectro-temporal modulation index (STMI; Elhilali et al., 2003) and the speech-based envelope power spectrum model (sEPSM; Jørgensen and Dau, 2011) were evaluated in conditions of noisy speech subjected to reverberation, and to nonlinear distortions through either a phase jitter process or noise reduction via spectral subtraction. The contributions of the individual preprocessing stages in the models and the role of the decision metrics were analyzed in the different experimental conditions. It is demonstrated that an explicit across-frequency envelope processing stage, as assumed in the STMI, together with the metric based on the envelope power
signal-to-noise ratio, as assumed in the sEPSM, are required to account for all three conditions. However, a simple across audio-frequency mechanism combined with a purely temporal modulation filterbank is assumed to be sufficient to describe the data, i.e., a joint two-dimensional modulation filterbank might not be required.
Original languageEnglish
Article number060128
JournalMeetings on Acoustics. Proceedings
Volume19
Number of pages8
ISSN1939-800X
DOIs
Publication statusPublished - 2013
Event21st International Congress on Acoustics - Montreal, Canada
Duration: 2 Jun 20137 Jun 2013
Conference number: 21
http://www.ica2013montreal.org/

Conference

Conference21st International Congress on Acoustics
Number21
CountryCanada
CityMontreal
Period02/06/201307/06/2013
Internet address

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