The relation between speech intelligibility and the complex modulation spectrum

Steven Greenberg · Takayuki Arai

78 citations0/0 files storedEuropean Conference on Speech Communication and Technology (Eurospeech)

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Phonetics and Phonology Research Speech and Audio Processing Neuroscience and Music Perception

Abstract

The amplitude and phase components of the modulation spectrum were dissociated in order to ascertain the importance of cross-spectral, envelope-modulation phase information for understanding spoken language. The dissociation was effected via local time reversals of the speech waveform (i.e., flipping the signal on its horizontal axis) at intervals ranging between 0 and 180 ms. Intelligibility declines progressively as the length of the time-reversed segment increases, down to an asymptotic trough in performance at 100 ms (4% of the words correct). Intelligibility does not correlate highly with the amplitude component of the modulation spectrum, but does coincide closely with the contour of the complex modulation spectrum, a representation that integrates the cross-spectral modulation phase and the conventional (amplitude-based) modulation spectrum into a unified representation. The results imply that intelligibility is based on both the phase and amplitude components of the modulation spectrum.

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References

1994Effect of temporal envelope smearing on speech reception 1999Speaking in shorthand – A syllable-centric perspective for understanding pronunciation variation 1999Cognitive restoration of reversed speech

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2004Spatial frequency requirements for audiovisual speech perception 2006Dynamics of speech production and perception 2014Long-Term Temporal Tracking of Speech Rate Affects Spoken-Word Recognition 2010Cochlea-scaled spectral entropy predicts rate-invariant intelligibility of temporally distorted sentences 2006Speech Processing in the Auditory System: An Overview 2012Speech Perception from a Neurophysiological Perspective 2020Effects of Video Reversal on Gaze Patterns during Signed Narrative Comprehension 2008Exploring the Role of the Modulation Spectrum in Phoneme Recognition

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